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FRESH VOICES from OWNERS BLH SPEAKERS ACCESSORIES DIY BOX KIT DO-IT-YOURSELF BOX KITS  second Hasehiro sells do-it-yourself speaker box kit of 15 sizes for Hasehiro back loaded horn system in Japan. This allows the owners to enjoy the improvement of the sound to the owner's taste after completion. Let's introduce some of them.   MM-S: shallow bookshelf-type BLH speakers MM: bookshelf-type BLH speakers MM-T: tallboy-type BLH speakers MM-ST: shallow tallboy-type BLH speakers Owner Reviews st  nd  rd  th  ast Reviews on DIY kits for MM series   Mr.Hosono, Saitama Pref.   June 2011 I enjoyed listening music by MM-151S with PARC Audio DCU-F131W for almost 2 years. It was not necessary bad. However, I felt a lack in the combination, for example, the sound has a tightening feeling and lacks a feeling of freedom. So I bought MM-151ST to exert the ability of DCU-F131W. DCU-F131W I put a CD with great anticipation. The released bass sent my spirits aloft, but it lacks the sharpness of bass when listen carefully. So I put wood cubes under the four corners of MM-151ST. Oscar Peterson jazz It's an old CD but good recording. Rich deep bass note echoed throughout the room. I am wonderfully comfortable. Strangely, the high tone also extended due to extending the bass. I could clearly hear hi-hat. MM-151ST with PARC Audio DCU-F131W doesn't have like JBL and ALTEC sound, it's a Japanese earnest sound. It's a large scale sound, hard to imagine it is just a single 13cm driver when I close my eyes. Bruckner: Symphony No.7 Blomstedt Staatskapelle Dresden orchestra It's an early digital recording CD, and this CD is essential for the trial listening of a loudspeaker for me because of the wonderful hall and orchestra. MM-151ST with PARC Audio DCU-F131W played sonorous heavy low-pitched string and the pure high-pitched string reaching far. It has a well-balanced woodwind and brass, too. I didn't feel like it's a long listening time exceeds 70 minutes. Hideaki Tokunaga vocal I listened to "Eien no Hateni" from his relatively-recent CD album. This is not a critical defect, but that sounded a thick harsh voice slightly. And it seemed to me that the base note was in pain. Such problems remain to be solved by the adjustment of the system: MM-151ST with PARC Audio DCU-F131W. Generally I have a feeling that MM-151ST brought out 90% of the ability of PARC Audio DCU-F131W. Change in the enclosure from MM-151S to MM-151ST was a great success. My curiosity began to get the upper hand here. I have PARC Audio DCU-F122W too, but it has the timbre of a high-tone range emphasis. I stowed that away in the closet because I didn't like the timbre very much. What kind of sound does it play if I mount DCU-F122W on MM-151ST? DCU-F122W This is also a wonderful combination of MM-151ST and PARC Audio DCU-F122W. I don't mind the timbre of a high-tone range emphasis. Perhaps this is because the low-pitched sound extends enough. Above all, I was surprised by the crispness of bass, good footwork and a sense of speed. It feels nice look like a promising soccer player. The voluminousness of bass was enough in the case of DCU-F131W, but I felt a partially leaden bass. As may be expected of this driver designed for back loaded system, the performance of MM-151ST with PARC Audio DCU-F122W exceeds DCU-F131W in jazz and pop music. In total, DCU-F131W and DCU-F122W are evenly matched, but MM-151ST with PARC Audio DCU-F131W exceeds DCU-F122W in the freshness of high-pitched string and the wetness of vocal. One who is listening to an orchestra and an opera, will choose DCU-F131W without a doubt. MM-151ST: 190(W)X710(H)X250(D)mm   MM-151ST with PARC Audio DCU-F122W  Mr.Sakai, Chiba City   May 2011 Many thanks, I received MM-161S yesterday. I immediately put the kit together with instructions, and mounted FOSTEX MG100HR on the MM-161S today. I wasn't able to make much progress on the first MM-161S, but I could assemble the second MM-161S without much resistance. MG100HR For the time being, I didn't put any acoustic absorption materials into the MM-161S air chambers. And I listened to iPod sound through the MM-161S by IC amplifier at only JPY1,280 as energy-conservation aging system. Great!!! The bass reproduction is unbelievable! It not only produces bass volume, but also texture of the atmosphere such as musical scale, thrum and bass drum. The sound of the high-tone and midrange are sensitive, and it communicates the afterglow. I thought, "what have I been listening for?" I should've bought it earlier. I'm looking forward to listening to uncompressed audio source by my own tube amp! But I think the midrange is slightly inferior to the bass. Thank you, anyway. P.S. I've been aging for it since yesterday. The high-tone and midrange became listener-friendly sound more.   MM-161S: 220(W)X450(H)X250(D)mm     He living in Aichi replaced the side boards with laminated wood of gum trees, and painted inside the horns. Super tweeters are FOSTEX FT96H, but he substituted JBL UT-405's boxes as their boxes.     MM-191T with FOSTEX FE208ES and FT96H   MM-191T: 310(W)X900(H)X450(D)mm    Hasehiro Audio   April 2011 ― Report from Hasehiro ― We could complete 7-channel speaker set for AV. At last, we could deliver three WCW-F200A for the front speakers and four MM-161S with FOSTEX F120A for the rear speakers.   Last spring, the customer visited our listening room and he really liked the sound quality of WCW-F200A. He said that he hopes to complete AV system with WCW-F200A as the main speaker. At first, he had an idea of full WCW-F200A system but it is very expensive to buy. So he decided for MM series for the rear speakers. I received advice on the drivers of the rear speakers, so I recommended FOSTEX F200A's WCW-F200A sister driver F120A (12cm). But I've never listened to the sound of FOSTEX F120A after mounting on MM enclosure.   FOSTEX F200A (20cm) has beautiful sound due to alnico magnet. Especially, the stringed instrument is pure and burnished sound. I am sure FOSTEX F120A has the same characteristics as F200A, so it will going to be just like the sound quality of WCW-F200A if mount it on MM-161S. Four MM-161S were special order. Specifically, we impregnated them with SSC compound and assembled. I listened to string music before delivery because I was afraid of the sound quality.   I feel relieved. Sure enough, the SSC impregnated MM-161S with FOSTEX F120A was descended from WCW-F200A as a whole. It sounds fresh strings and has appealing sound quality. The high-tone range has a silky texture. Ferrite magnet can't depict the soothing silky tone. I can highly recommend FOSTEX F120A to string listeners.   SSC coated 4-MM-161S with FOSTEX F120A   MM-161S: 220(W)X450(H)X250(D)mm     Details of MM Kit Series     MM-141S with carrozzeria TS-E1076 http://ameblo.jp/ultramatic-cs/archive1-200906.html  Mr.Ito, Tochigi Pref.   October 2008 I mounted some drivers on the baffle boards I recently purchased from you and listened these sounds. MM-151S with Vifa TG9FD10-04 I was really surprised. I don't think it's 8cm-class driver's bass. Bass came out first when I turn up the speakers from zero. It hides a beautiful high note. Probably, I think that MM-141S provides the best balance of Vifa TG9FD10-04. MM-151S with Pioneer PE-101A The sound quite good. At first the bass left something to be desired. But about 30 hours pass and the balance has gotten much better gradually. I will observe the change for a while. It's 12cm-class size in spite of 10cm driver so I'll mount it on MM-161 since then. MM-161 with PARC Audio DCU-F131P Bass is enough from the start. It reasembles Vifa TG9FD10-04 in its feeling. At first the mid-high note left something to be desired. But about 20 hours pass and the balance has gotten much better gradually. I will observe the change for a while. MM-151S: 190(W)X450(H)X250(D)mm MM-161: 220(W)X450(H)X410(D)mm    March 2009 This winter, I mounted some other drivers again. MM-151S with FOSTEX FF85K I remounted it on MM-151S from AMA-131SS. It doesn't have a muffled sound even a large enclosure. Bass is natural and unconstrained rather than for AMA-131SS. I don't feel a lack of the volume, too. MM-151S with Fountek FR88EX I can feel more bass than FOSTEX FF85K and it is a cheerful color. It has a straight stretch of frequency zone at the mid-high note than FOSTEX FF85K despite it is inferior to FF85K on actual reproduction frequency response. MM-151S with Tang Band W3-1231SN Mid-low-pitched tone is a cheerful color and it doesn't have a muffled sound. Bass comes out like Fountek FR88EX. But high-pitched tone is uncolorful compared with the mid-low-pitched tone. So, I feel that Fountek FR88EX and FOSTEX FF85K are more colorful than Tang Band W3-1231SN. Concerning above-mentioned three 8cm-class drivers, it's better to turn up the bass to around 1:00 to 3:00 depending on music and the volume. MM-151S with Tang Band W4-930SG It is 10cm driver. I remounted it on MM-151S from bass reflex. Is it fit for back loaded horn system...? Because its magnet is small... It'll be tight, the sound doesn't shut oneself away around the edge. But surprisingly, the sound quite good. Bass is great including the volume compared with the previous 8cm-class drivers (FF85K, FR88EX and W3-1231SN). The sound extends downward, too. Overall, it's a coherent sound. Tang Band W4-930SG provides superior cost performance. I hope this helps. MM-151S: 190(W)X450(H)X250(D)mm    August 2009 From spring to summer, I tried some 12/13cm-class drivers. MM-161/161S with SICA Z002400 I mounted it on MM-161. At first bass is light, but the range balance is good. As time goes by, bass came out gradually. But I hope that the tone ought to be a little more go down because it is 12cm driver. It has better resolution at the midrange and the high-tone range. So, it is a clear color on the whole. I remounted it on the upgraded MM-161S from MM-151S. Bass became a little tight, but the volume differs little from before. Mid-low-pitched tone began to come out a little. The range balance is much better than before. A special characteristic of Italian SICA Z002400 is nothing, it is generally-benign driver. Compared with FOSTEX FF and FE series, it is easy to care for. Some listeners would think, "the sound is as dull as dishwater." It is full-range speaker driver, but better to use as an extended squawker from the viewpoint of the reproduction frequency response, and add a tweeter and a woofer. MM-161/161S with PARC Audio DCU-F131PP I mounted it on MM-161. Bass came out enough from the start, but the mid-high-pitched tone is hard. Time has passed since then. The bass was spread downward and separation of the mid-high-pitched tone has improved. So, it became easier to listen to music. Mid-high-pitched tone is slim, but it extends upward. So, I can feel briskness. I remounted it on the upgraded MM-161S from MM-151S. MM-161S suppressed the volume of bass, so I felt a little tight. I hoped that MM-161S achieves further improve the briskness, but the midrange was underscored by results from MM-161S. It has no briskness anymore. I wonder if it's because MM-161S air chamber is small compared with MM-161 air chamber. It's not that bad because the singing voice comes out to the fore. But still where it's gone? And it seems that bass is missing depending on music. In that case, all that's required is that turn up the bass to around 2:00 or 3:00. MM-161 with PARC Audio DCU-F131P I previewed the sound again I reported before. It is the same character traits as PARC Audio DCU-F131PP, but the bass, the mid-high-pitched tone and the volume are more rich compared with DCU-F131PP. I can say that it is a big brother of DCU-F131PP. I can hear the bass even lower the volume, so it is also better as BGM when I sleep. Somehow it is similar to BOSE 125 West Borough® MM-161 with PARC Audio DCU-F131W Some bass comes out from the start, too. It is a soft sound and the mid-high-pitched tone is well-balanced pure sound. Time has passed since then. The bass is spread downward and the mid-high-pitched tone is well-balanced refreshing sound at high resolution, in other words, it is a clear color. Depending on personal preference, I think that the best-balanced driver is DCU-F131W in these 3 drivers of PARC Audio. I guess PARC Audio driver is under load at the back properly on any driver, and they are a very interesting drivers because the difference in material appears on the sound. Thay are easily-handled speaker drivers. MM-161 with FOSTEX FE126E At first, it was hardish sound and the bass needed a little work. Time has passed since then. The volume of the bass stays about the same, but the bass was spread downward. So, the bass is a reasonably well. The resolution of the mid-high-pitched tone has risen, and it became easier to listen to music. It's better to turn up the bass to around 3:00. High-pitched tone is a sharp color. Maybe I should upgrade to a bigger MM speaker box for it later. MM-161 with FOSTEX FX120 It was easier to listen and the bass was a reasonably well from the start. Time has passed since then. The bass came out enough with the spread downward. Overall, it gives me a feeling of calm without gorgeousness. The resolution was so good I could listen to a hidden behind sound. I feel like it is one of monitor speakers. FOSTEX FX120 has a well-balanced adult vibrancy. MM-161/161S with FOSTEX F120A I mounted it on MM-161. It was a soft sound and the bass had much more volume than FOSTEX FX120 from the start. As time goes by, it has increased its softness and the volume of the bass. The high-pitched tone is quiet against the great bass. So it is easier to listen, but it has a muffled sound in the higher midrange and the high-pitched tone. Due to this, it lacks briskness. In that case, all that's required is that turn up the treble to around 2:00 or 3:00. It may be able to improve as time passes. So, I changed the box from MM-161 to the upgraded MM-161S. The volume of the great bass decreased a little, but it eliminated the muffled sound slightly. As a result, the high-pitched tone began to come out a little forward. FOSTEX F120A is more suited to MM-161S than MM-161 from the viewpoint of balance. Bass has good tone and the mid-low-pitched tone has a special atmosphere, but there is something lacking. All that's required is that turn up the treble a little, but I will solve the problem if I tune it by insulator and paint. Originally, FOSTEX F120A may not adequate to the back loaded system because it has a dent at 10kHz in the frequency response. Among all these FOSTEX drivers, FX120 was the best for me. It is a well-balanced driver and a high resolution. So I had a high level of satisfaction with no change for FOSTEX FX120, like PARC Audio DCU-F131W. I put Tozawa styled resonaters into MM-161 four by four, and also I put it into MM-161S/151S two by two. MM-161 with Jordan JX92S First, I felt a little tight about bass but it came out a little more than a little, and the mid-high-pitched tone had a balanced sound. Unlike the metal foil cone, the sound is out obediently. Time has passed since then. The bass was spread downward and it became sufficiently volume. First, the high-pitched tone was closely tied with each other, but it separated individually. Overall, it is similar to FOSTEX FX120 with higher resolution. But metallic high-pitched sound is plain. I feel like it is one of monitor speakers, and it conforms to instrumental music. MM-161S: 220(W)X450(H)X250(D)mm MM-161: 220(W)X450(H)X410(D)mm    January 2010 I tried some 8cm-class drivers again. MM-151S with Tang Band W3-315SE It is aluminum cone driver. The Bass is unbelievable from the start. It's 12cm-like bass. It's hard to imagine that the volume and the tone are from only 8cm-class driver, too. But the high-pitched tone lacks exhilaration by contrast. Overall, it's a sharp sound, but it plays around mid-low-pitched tone. I thought, MM-151S may be too big for Tang Band W3-315SE. But I put thermowool about 13mm thick into MM-151S one by one as a trial, so one of MM-151S contains two Tozawa styled resonaters and one thermowool. As a result, the bass remains unchanged, the midrange became docile slightly and instead exhilaration is coming to the high-pitched tone. It's better to lower the bass to 10:00 or 9:00 for balance. Tang Band W3-315SE needs a tuning by sound absorbing materials. Somehow it is similar to BOSE 201 series. MM-151S with Tang Band W3-583SE It is paper cone driver. The bass has no advantage over to the bass of Tang Band W3-315SE, but the bass also came out with a great volume. The mid-high-pitched tone is some clearness, the balance is better than that of W3-315SE. Tang Band W3-583SE is just like paper cone to play with an up-front tone. I didn't feel unusually-enhanced range, so it's easier to listen. MM-151S with Tang Band W3-593SD It is coated paper cone driver. It is an old edition because I bought it well before. The sound is similar to Tang Band W3-583SE. I don't feel a lack of the bass. The mid-high-pitched tone is a sharp sound, and the balance is good. Tang Band W3-593SD makes oneself indispensable to me. MM-151S with Tang Band W3-582SB It is polypropylene cone driver. Also it is an old edition because I bought it well before. I don't feel a lack of the bass, but it's a rounded bass at the base. The mid-high-pitched tone is a clear sound, and it comes out more than that of Tang Band W3-593SD. The balance is good, too. It conforms to vocal music because of tender tone. It's hard to imagine that the sound is from only 8cm-class driver. Tang Band W3-582SB is an amazing value for money. MM-151S with Monacor SPH-30X It is kevlar cone driver. The mid-high-pitched tone is a sharp and a clear sound, but it is a slightly-angular sound. I felt a lack of the bass volume. So, I turned up the bass to around 2:00 or 3:00. As a result, I could enjoy satisfactory bass volume and it came out at high resolution. I was a little surprised by an incredible sound when I turned up the volume a little in the condition. But I was bothered by a slightly-angular sound of the mid-high-pitched tone. I can't listen to music for a long time under such circumstances. Therefore, I put thermowool about 13mm thick into MM-151S one by one as a trial. So, one of MM-151S contains two Tozawa styled resonaters and one thermowool. As a result, the slightly-angular sound is gone without losing clearness. And the reality of sound has increased. Monacor SPH-30X needs a tuning by sound absorbing materials. MM-151S with FOSTEX FE83En At first the bass doesn't come out at all, but the mid-high-pitched tone is a sharp sound. The Bass gradually comes out as time goes on, but I think good to set the bass at around 3:00. Separation of the mid-high-pitched tone has improved even better. Overall, it has a high clearness. I put thermowool about 13mm thick into MM-151S one by one as a trial. So, one of MM-151S contains two Tozawa styled resonaters and one thermowool. The bass remains unchanged, and the mid-high-pitched tone got hard. So, I feel tight depending on the music. And so I replaced thermowool with about 3mm-thick shredded black color wool for handicraft as a trial again. I made a hole about 200mm in diameter in the shredded black wool and I folded it into four. I was under the impression that it has an effect similar to thermowool. But it was good. There is no more tight high-pitched tone and it became easier to listen to music. The volume of the mid-high-pitched tone decreased and the bass volume increased. So, the balance is better than that of thermowool. But it doesn't have much of the flavor of bass. Therefore, it actually feel lighter than AMA-131SS (TB) despite MM-151S. MM-151S is a strange speaker box. Originally MM-151S is for 10cm driver, but it pulls out all of its driver if mount the lower-class driver on it. I am impressed with the ability of Hasehiro speakers. That's the art of the exponential curved horn? For me, MM-151S is very convenient speaker box to learn about nature of speaker driver. Just prepare the baffle boards for it. I hope someone find my report. MM-151S: 190(W)X450(H)X250(D)mm    August 2010 This time, I listened to the sound of around some 10cm-class drivers. I put Tozawa styled resonaters into MM-161 four by four, and also I put it into MM-151S two by two. MM-151S with Dayton RS100-4 It is coated aluminum cone driver. I didn't feel a lack of the bass from the start. The midrange was so-so, but it had a shortage of the high-pitched tone. Lowly bass came out over time, and it is similar in tone to Tang Band W3-315SE. But the high-pitched tone is more natural than that of W3-315SE. It stays in balance even lower volume. Overall, it is a moderate sharp sound because the volume of the high-pitched tone is low. The bass volume is enough but its resolution was low. So I put flannel cloth for car wax into MM-151S one by one as a trial. So, one of MM-151S contains two Tozawa styled resonaters and one flannel cloth. As a result, it came out a vivid sound without losing the bass volume. The midrange came out a little forward, but I didn't feel a change of the high-pitched tone. The bass resolution has increased from before without off-balance. Dayton Audio RS100-4 needs a tuning by sound absorbing materials. MM-161/151S with MarkAudio Alpair7 It is aluminum-magnesium cone driver. I mounted it on MM-161 impatiently before the baffle boards for MM-151S arrive. At first, the bass was hard but its volume was enough. The mid-high-pitched tone cames out clear. Extension of the high-pitched tone is not bad, too. It's a balanced sound. The passage of time helps relieve a lot of hard bass, and it became more lowly bass. Overall, it is a flat balanced sound without enhanced range. It is sharp and clear with extended sound to high-tone range, but it is not MM-161 ability. So, the bass is not enough compared to the mid-high-pitched tone.   The baffle boards for MM-151S arrived on my hand. I remounted it on MM-151S. It has a big flange, so it is pleasing to the eye. Compared to MM-161, the midrange came out a little to the fore, the bass has a lot of energy, it has increased the volume and the range has widened way down. It is suited to MM-151S compared to MM-161. The bass resolution is not bad. And the only use of Tozawa styled resonaters as sound absorbing materials get good results because the mid-high-pitched tone is a sharp and a clear sound. Somehow MarkAudio Alpair7 is similar to Jordan JX92S mounted on MM-161. MM-151S with FOSTEX FE103En The midrange looks like a million dollars from the start. It had skinny high-pitched tone. And it had a shortage of the bass volume, but a good atmosphere. It has increased the bass volume with time, but it's FE series-like balance, spreading from the midrange both high and low. The midrange is a beautiful tone. I think good to set the bass at around 2:00 or 3:00. And so, I thought it will get more better if I tone down the midrange slightly by sound absorbing materials. I put thermowool about 7mm thick (150x200mm) into MM-151S one by one. One of MM-151S contains two Tozawa styled resonaters and one thermowool. As a result, the midrange took one step back and thick bass came out. It turned out just as one wished. The bass doesn't need to turn, but it is better to turn up the volume to around 15 to 30 minutes ahead because the midrange took one step back. MM-161/151S with FOSTEX FE103En-S FOSTEX FE103En-S is limited-production driver. I mounted it on MM-151S. Some bass was coming from the start. The bass has more volume than that of FOSTEX FE103En at this point. The midrange is not self-assertive compared to FE103En, but the balance with the high-tone range is not bad. But it is jumbled together around hi-hat. The bass is lower and the bass volume was increased more than before as time passes. And also, the mid-high-pitched tone became clearer little by little including a jumble of sound around hi-hat. Overall, it is a flat balanced and relaxing sharp sound. FOSTEX FE103En-S is an almighty driver with high resolution. Metaphorically speaking, FE103En is an active junior staff require following (sound absorbing materials) and FE103En-S is a mid-level staff require no following (sound absorbing materials). FE103En-S looks like FOSTEX FE series, but the sound is like FX or F series. It has a big magnet. So, I mounted it on MM-161, too. I knew it has a much lower bass and a much heavy. But the volume decreased. The mid-high-pitched tone became clear and typical balance of FOSTEX FE series. I think good to set the bass at around 2:00 or 3:00 in balance. It has increased reality compared to MM-151S when I listened to music at this condition. MM-151S with FOSTEX FE108EΣ FOSTEX FE108EΣ is exclusive driver for back loaded horn system. I had the impression that it is a powerful driver of FOSTEX FE series and a well-balanced sound when I first listened to sound. But I felt a little tight about S's and CH's. It became more powerful and came out a much lower bass as time passes. And the mid-high-pitched tone became more FOSTEX FE series-like sound brightly with a forceful tone. Tightness faded with time and the high-tone range extended upward from the midrange. The bass is like FOSTEX FE103En-S and the mid-high-pitched tone is like FOSTEX FE103En. Expressed correctly, FE103En-S was given the bass of FOSTEX FE108EΣ. Only use of Tozawa styled resonaters as sound absorbing materials is not bad, but I felt clouded tone when I listened to spoken text. So I put thermowool about 7mm thick (150x200mm) into MM-151S after fold it in the middle. As a result, the bass resolution became quite high but the high-pitched tone remains unchanged. Meanwhile, the midrange volume went down, but it has increased sharpness and the clouded tone went away. So, it is enough to turn up the volume to around 0 to 15 minutes ahead. The material and the structure of FOSTEX FE-EΣ series are used to its special speaker drivers. I should listen to the sound of FOSTEX FE108EΣ sooner. MM-161/151S with PARC Audio DCU-F121W It is wood cone driver. I mounted it on MM-151S. Unlike FOSTEX drivers, it can send bass without any trouble. It is a feature of PARC Audio drivers. It has a spreading high-pitched tone and the mid-high-pitched tone is  a sharp and a clear sound. I feel quite refreshed by the sound. So, only use of Tozawa styled resonaters as sound absorbing materials is not bad. But, somehow I didn't feel clearness to the bass compared to the mid-high-pitched tone. So I put flannel cloth (250x250mm) into MM-151S after fold it into four. The bass volume and resolution became quite high. And also, it became much lower. The midrange got thick and it became docile. And also, it pulled the high-tone range but the high-tone range really hasn't changed. Flannel cloth is a little too much. It weakened the clearness. Even so, it conforms to vocal music because it has a good balance of high and low. I divided the flannel cloth into halves. The bass volume went down, but the clearness of the midrange came back. I think suitable amount of flannel cloth is about 125x250mm and fold it in the middle. I remounted it on MM-161. It lacks the bass volume, but it is coming out naturally. So the bass has a good atmosphere. The mid-high-pitched tone is like big-brotherly its DCU-F131W: It is a beautiful tone, and it has increased the clearness compared to MM-151S. It's better to turn up the bass to around 2:00 or 3:00 for balance. MM-161/151S with PARC Audio DCU-F122W PARC Audio DCU-F122W is limited-production driver for back loaded horn system. I mounted it on MM-151S. At first bass was hard a little, but the bass volume was so-so. It had a brilliant mid-high-pitched tone at this point. The passage of time helps relieve a lot of hard bass, and it became more lowly bass. The bass resolution is not bad, too. A brilliant mid-high-pitched tone dissipated, and it became clear and sharp like PARC Audio speaker driver. PARC Audio DCU-F122W is similar to tuned DCU-F121W. But the bass is more natural than that of tuned DCU-F121W. Only use of Tozawa styled resonaters as sound absorbing materials get better results just as expected of the back loaded horn system-use speaker driver. PARC Audio chose Hasehiro speaker box MM-151S as recommended back loaded horn speaker box for their limited-production driver DCU-F122W. I thought I'm going to tone down the midrange slightly and I put thermowool about 13mm thick (100x140mm) into MM-151S one by one. The midrange became a little rounded tone. Relatively speaking the bass took a step forward, and the bass atmosphere became more good than before. It became more easier to listen to music because the tight midrange  disappeared that sometimes I felt depending on the music. Balance is also better than before. This is a matter of taste, maybe it will play PARC Audio wood cone-like tone if reduce the amount of the thermowool. Next, I remounted it on MM-161. It is coming out naturally because of larger air chamber. It plays the bass with good atmosphere without feeling too much pressure. The bass volume is so-so. I don't feel a lack of bass volume if turn up the volume a little. Color of the mid-high-pitched tone remains unchanged, but it has increased its spatial spreading because of larger baffle board. It has increased spatial depth feel, too. It became a 3D spatial sound. I felt the prettiness of its tone when I listened to the sound of PARC Audio DCU-F121W. But even more I feel the force of sound particles to this sound. This is like a metallic cone sound. Somehow this is a mature tone. MM-151S is more like PARC Audio wood cone, compared to MM-161. I'm going to tone down the midrange as a trial. I put thermowool about 7mm thick (150x230mm) into MM-161. So, one of MM-161 contains four Tozawa styled resonaters and one thermowool. It turned out just as one wished. The decline in midrange volume was small but I have a feeling that it gets rid of excessive sound. It suppressed a little high-pitched tone. The bass took a step forward, and it became a subdued sharp tone. So it was easier to listen. Balance is like monitor speaker, but I like this sound better. It can be turned the volume down to around 15 to 30 minutes back. If someone wants to feel comfortable with PARC Audio wood cone-like tone by MM-161, it is better to choose its DCU-F131W normally. MM-151S with Tang Band W3-1319SA This is 8cm driver, not 10cm. And it is bamboo fiber paper cone driver. The color of the cone paper looks like Pioneer PE-101A. It has the bass volume with a good atmosphere from the start. The mid-high-pitched tone is natural and subdued. It doesn't have a muffled sound, but it seems decidedly mid-low-pitched tone-sided to me. It came out lower bass with much bass volume as time passes. It is like 12cm-class bass mounted on MM-161. The mid-high-pitched tone is still natural and subdued. Spread of high-pitched tone is weak. But this is totally-balanced sound using only Tozawa styled resonaters as sound absorbing materials. The sound of Tang Band W3-1319SA is like its W3-583SE. MM-161 with SICA Z002320 This is 12.7cm driver, not 10cm. And it is coaxial speaker driver, the woofer is paper cone and the domical tweeter is polycarbonate. Bass is enough from the start, but somehow it is like bass reflex sound. The mid-high-pitched tone spreads well with clarity, but it loses touch with the bass in sound quality. In other words, it is a hard sound quality. It bacame lower bass and higher resolution a little as time passes. The mid-high-pitched tone became comfortable with the bass. And also it softened, but spread of mid-high-pitched tone weakened. Overall, I don't feel unusually-enhanced range and also unusually-deficient range. I feel like it is one of monitor speakers with a flat range. The volume and the atmosphere of the bass are enough, but it doesn't tint on the sound. It seems that plain sound is the feature of Italian SICA. Also I felt like that when I listened to the sound of SICA Z002400. Strange to say, it has a good sound ordinarily and it seems that it plays modestly-satisfiable sound mounted on any enclosure. It is coaxial 2-way speaker driver. So, SICA Z002320 is very user-friendly for everyone because it has more clearance of bass, compared to its Z002400. I hope this helps. MM-151S: 190(W)X450(H)X250(D)mm MM-161: 220(W)X450(H)X410(D)mm    October 2013 Each company put various 10cm-class drivers on sale from the end of last year. So I tried and tell you. MM-161 with PARC Audio DCU-F123W It pass by the name of "BLUE PARC" and is limited-production driver using alnico magnet. First, I prepared the baffle boards for MM-151S with the intention of mounting them on 151S. But it turned out that PARC Audio DCU-F123W is not placed in MM-151S because of a gigantic magnet. So, I mounted them on MM-161. I was concerned about the high frequency range of the spec sheet: 16kHz at the point of purchase. But my concern proved unfounded when I listen to the sound without any sound absorbing material for now, as it is with DCU-F121W and DCU-F122W. DCU-F123W played PARClike pure high note from the start. Some starry sound in high note disappeared as time passes. It became ear-pleasing natural pure sound, and got underslung voluminous spread bass with more higher resolution. Overall, PARC Audio DCU-F123W is natural balanced sound around clear and mellifluous midrange. PARC Audio DCU-F122W mounted on MM-151S was also good, but DCU-F123W will be the most suitable for back loaded horn enclosure among PARC Audio 10cm-class wood cone driver series. I think one of the reasons is that DCU-F123W has the smallest Qts. MM-161/151S with PARC Audio DCU-F121A It has aluminum-magnesium cone like Markaudio, and its Qts is 0.34 so I tried with anticipation. First, I mounted it on MM-151S with Tozawa styled resonater. A pure sided mid-high pitch sound came out from the start unlike their wood cone driver series, but the bass was not as powerful as PARC Audio says. On the whole, it lost some of its firm as time passes. The mid-high-pitched tone became high-resolution sharp sound, especially easy buried metallic sound. The bass is good, and it has high resolution, but the voluminous and the spread were not enough. However, PARC Audio DCU-F121A plays well-balanced sound when I turn up the volume a little. Next, I mounted it on MM-161 with Tozawa styled resonater because I felt the bass tightness. MM-161 released the bass at once. The voluminous and the deepness are enough. The deepness was better when I mounted DCU-F121W and DCU-F122W on MM-161, but they lost the voluminous. PARC Audio DCU-F121A showed its stuff by mounted on MM-161; it turned out to be the right bass in PARC Audio-speak. The highlighted mid-high-pitched tone became faint, but the resolution and the sharpness haven't changed a bit. The midrange takes a few steps forward naturally, I think that the difference from Markaudio to the same cone material.   Air chamber of the enclosure for PARC Audio DCU-F121A is better to large capacity, maybe it's because of large magnet. MM-161 is better suited for DCU-F121A than MM-151S. MM-161/151S with PARC Audio DCU-F121K It has Kevlar® cone, and its Qts is 0.349 so I thought it is better suited for back loaded horn. First, I mounted it on MM-151S with Tozawa styled resonater. It does a good job of balancing high and low from a low volume in the beginning, furthermore the bass is enough. In that sense, PARC Audio DCU-F121K is similar to their wood cone driver series. As time passes, it played lowly enough bass, bright midrange and expanding pure high note without any adjustments such as sound absorbing materials. The sound is similar to the company's wood cone driver series, too. And also, Vifa TG9FD10-04. PARC Audio DCU-F121K is very excellent with MM-151S than "RED PARC". Next, I mounted it on MM-161 with Tozawa styled resonater. On bass, the voluminous has decreased a little, but it came out more natural and the resolution was even higher than MM-151S. The bass is not bad. I don't mind lack of the bass voluminous by turn up the volume. The midrange had taken a few steps forward but it kept in step with the bass and the high-pitched tone. On the whole of the mid and the high-tone range, DCU-F121K has pure sound like the company's wood cone driver series and the sound is much clearer than MM-151S. I think that the balance will get better if adjust to a little controlled mid-high-pitched tone. It may a good idea to mount on MM-151 for the balance. The sound changes from MM-151S to MM-161 are similar to the company's DCU-F121W and DCU-F122W. Which MM box is better for PARC Audio DCU-F121K? MM-151S is better if want power, and MM-161 (MM-151) is better if want clearness to the sound. MM-161/151S with FOSTEX FK10P It is a collaborative limited driver of Koizumi-musen and FOSTEX. It seems this material is based on FOSTEX P1000K. I mounted it on MM-151S with Tozawa styled resonater. On bass, FOSTEX FK10P played a nice voluminous and deepness from the very beginning. But the high-pitched tone had a feeling of congestion and I didn't feel fresh. P1000K The situation didn't change about 50 hours later, too. How long do I age it for balance the high-pitched tone with the bass? So I switched from tube power amplifier to integrated amplifier with tone controls, and turned up the treble control. It suddenly came out the high-pitched tone in just several tracks, and brought the overall balance. Amplifier switching helped open the treble passages, the aging might well have started with turn the volume up a little more. It plays a crisp nice mid-high-pitched tone on the high-resolution bass. But FOSTEX FK10P is not overaccentuate the mid-high-pitched tone than the company's FE-series, the sound is close to the company's current FF-series. I therefore switched amplifier back again. I mounted it on MM-161 with Tozawa styled resonater. The bass voluminous wasn't as drop as I thought at first; on the contrary it became more open and underslung bass. The mid-high-pitched tone was clear, I had the impression that the sound was spread up and down with balance. FOSTEX FK10P suits MM-161, too. It provides superior cost performance. Maybe FOSTEX FK10P plays good sound in any kind of MM box. AMP: DENON PMA-2000IV | Sansui AU-α607MOS Limited marantz SM6100SA MM-151S: 190(W)X450(H)X250(D)mm MM-161: 220(W)X450(H)X410(D)mm     Owner Reviews st  nd  rd  th   ast Reviews on DIY kits for MM series       Details of MM Kit Series     Thank you for coming to the sound reproducing world. Copyright © 2009-2014 TelaWorks Corporation, All Rights Reserved.