Exponential Curved Backloaded Horn Speakers
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FRESH VOICES
 
SPEAKERS ACCESSORIES DIY BOX KIT
 
 
 
DO-IT-YOURSELF KITfirst
 

Hasehiro sells do-it-yourself speaker box kit of 13 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 b/h speakers
MM: bookshelf-type b/h speakers
MM-T: tallboy-type b/h speakers
MM-ST: shallow tallboy-type b/h speakers
DIY kit for Hasehiro system
Fresh voices second  third
    
Past voices on DIY kits for MM series
 
 Mr.A, Fukushima Pref.
 
July 2010

(He purchased the upgrading parts from MM-151 to MM-171.)

I received the upgrading parts today.
I immediately upgraded to MM-171 from MM-151, and the drivers are
FOSTEX FE166En.
FE166En   SA/F80AMG
FE166En(16cm)    SA/F80AMG(8cm)
 
I was using DIY Audio SA/F80AMG on MM-151, and I thought
SA/F80AMG is a great driver for just 8cm.
But very, very different by changing to twice the size of driver.

I feel natural cohesiveness from midrange.
Vocal part was much better, and it would be better off in time.
I don't feel habit of backloaded horn system.
It reminds me that MM kit is a superb product.
Thank you very much.

MM-171: 250(W)X450(H)X410(D)mm

 
 
piomm151s.jpg
MM-151S with PIONEER PE-101A
http://blogs.yahoo.co.jp/nikaidoh_denbei/22770563.html
 
 
 Hasehiro Audio
 
April 2010

\ Report from Hasehiro \

We have finally been completed custom-made bonded type and 
SSC
coated MM-151TK from Mr.T.
Fostex MG100HR-S FOSTEX's limited driver MG100HR-S
has a pure magnesium diaphragm,
and it has a sense of speed
with clear-cut sound.
We mounted MG100HR-S on the bonded type SSC-MM-151TK.
It became more high-resolution brilliant sound than I thought.
Listening to drum session, the sofa makes a quick change to body
massager.
That's floor-shaking amazing bass, although it's only 10cm driver.
I think he will like them a lot.

MM-151TK: 190(W)X900(H)X450(D)mm

 
bonded type SSC MM-151TK with MG100HR-S

SSC-MM-151TK
(screwed the side baffle boards up tight, too.)
 
 
 Mr.Oguro, Hyogo Pref. 
 
October 2009

It has been a month since I asked you the adhesive joining and
the horn painting at Hasehiro audition gathering in Nanba.

 
I painted MM-141S at last.
The basecoat is aqueous urethane first coating material for
exclusive use.
After that it's so shiny, so I thought of giving up the overcoat
many times.


after base coating
after basecoating
 
The coating material is vermilion red of synthetic japan.
Synthetic japan get dry quickly compared to cashew japan, so it may
be said that synthetic japan is popular coating material.
My family said "There are mailboxes." or "There are bird feeders."
I painted three times now.

(An omission)

Before, I read an article in your website "The sound became docile
if painted with japan."
So I wanted to do this because once.
That's called a "japan red model."

after overcoating
after overcoating (three times)
 
 
Well, I will report on the sound.
Originally, it was shiny sound by
Vifa TG9FD drivers
.
But what's more, it is because
mirror-shiny clear sound.
I've seen many times,
"The paint turned up the volume."
Rather, I think it is more natural
to say
"There was no more need for
turn up the volume by the paint."
Because, the expression of
musical instruments and sound
source became fineness and rich.
As proof of this, I don't feel that
it's too loud when I listend at the
original volume level, I feel that
it's powerful sound.
 
Until now, I couldn't listen to the symphony, big-band sound and
the like because of a ball's sound.
Right now, the individual instruments became separated.
So I can listen to them with a comfortable feeling now.

vifa TG9FD
Vifa TG9FD with Brass Baffle Stabilizer
 
The scrape comes still short, but I tucked own brass parts into the
groove between the front baffle board and the side plates.
That's called a "BBS (brass baffle stabilizer)", that's mere decoration.

(An omission)

From now on I will paint the synthetic japan more than 20 times.
The thickness of japan could adversely affect...
If so, I will cry on your shoulder...

MM-141S: 160(W)X450(H)X250(D)mm
 
 
MM-151SKN
collaboration the housing exhibit
 
PageTop
 
 Mr.Ishikawa, Iwate Pref.
 
June 2009

I painted MM-151S.

First, I transfuse school glue to the whole with a damp cloth.
After drying, I polish the whole with sandpaper.
I repeated the workflow three times and painted aqueous clear coating
over this.
Then, I polish the whole with sandpaper.
I repeated the workflow three times, too.


MM-151S
MM-151S
Finnish birch baffle
 
Incidentally, I changed the front baffle board
to Finnish birch 18mm thick.
Well, the sound was...
Hmm.
The sound like something was clogged up.
That couldn't be...
It fell short of our expectations and we
walked away disappointed.
There was no effect of hard Finnish birch.

I explored possible solutions on the Internet.
I learned that the cutting of the back of the
front baffle board is effective in improving
the performance for small speaker drivers.
I tried but I couldn't whittle away at the
birch caused by hard material.
So I asked a carpenter to that.
Now, I can see the cone of the driver in full
view from the back of the front baffle
board.

The result...
It was a great success.
The lack of the high-tone range disappeared
and the mid-high-tone range feels so good.
It is totally satisfying flat feeling.
If saying severely is that I want to plus 1.5dB around 3kHz and minus
1.5dB around 250Hz.

I want to try the noise absorbing material as the final adjustment.
What's the sound coming to?

MM-151S: 190(W)X450(H)X250(D)mm
 
 Mr.F, Gunma Pref. 
 
April 2009

I bought PARC Audio DCU-F131W drivers and
SSC coated front baffle boards.
It has been about 10 days since they started playing. So I report.

This is the first time MM-151S has been replaced in 5 years.
Five years have passed since I replaced from TANNOY SYSTEM
12 DMTII to ALTEC CF204-8A mounted on MM-151S.

CF204-8A
CF204-8A

I have thoroughly enjoyed without regret during the past five years.
But I was interested in Victor's wood cone driver.
I have come to replace to PARC Audio DCU-F131W due to the good
reputation of its wood cone driver.

MM-151S is dry perfectly in the past 5 years.
I bonded the MDF board to one another with Titebond, and I gave the
surface five coats of oil-based urethane varnish.
Let's start off with CF204-8A.
To my surprise, I couldn't listen to the violin due to the strong stimulus
to my ears until now, but I could listen to it with comfortable.
I had an aha moment, I didn't think it changes a lot by bond and coat.

I mounted DCU-F131W on the SSC coated front baffle board.
Before the mount, I gave the surface of SSC baffles two coats of
oil-based urethane varnish.


MM-151S with PARC DCU-F131W
MM-151S with PARC Audio DCU-F131W
 
I'm surprised the amazing bass from the beginning.
But it had a poor sound in some of the mid-high-pitched tone.
So, I put both of each other face-to-face and connected one channel
by reverse phase.
And I leave them for about 4 hours after turned up the volume.
After that, they played CDs and a TV playing till now.
During that time, the sound got better and better, and the poor sound
of the mid-high-pitched tone disappears every day by degrees.

The renewal MM-151S is a little bit less than previous MM-151S about
sharpness and force, but the renewal MM-151S has a rich bass and
shiny mid-high-pitched tone.
The renewal MM-151S plays any music with comfortable to me.
In particular, vocal and piano music are excellent.

Eric Clapton "Unplugged"
At first, PARC Audio DCU-F131W is less than ALTEC CF204-8A.
However, it has now became quite high realistic sensation.
I can enjoy it.

Midori "Encore!"
Chases violin and piano reverberate with big realistic sensation.
I could listen to the high-pitched sounds of a violin without strong
stimulus to my ears.
But I still feel a little tight to the highest pitch.
Whether it is fate of full-range speaker driver or whether it gets better
by aging...
I'm looking forward to it.

Henryk Szeryng / Arthur Grumiaux
J.S. Bach "The Violin Sonatas" "The Partitas"
I can only say they are a great.

The Modern Jazz Quartet "DJANGO"
Despite the monaural recording, I could listen to each instrumental
sound clearly with a superb chases and shiny vibrancy of vibes
by Milt Jackson.
The feelings are what I am addicted to.

I couldn't listen to these musics except Eric Clapton during
the past 5 years. Nevertheless, ALTEC CF204-8A delighted me with
piano trio and vocal music, etc.
A forceful and a sharp tone of CF204-8A was appealing to me.
By the way, PARC Audio DCU-F131W is a good speaker driver
as I expected. I'm glad I decided to replace ALTEC CF204-8A with
PARC Audio DCU-F131W.

I want to spend the time with MM-151S for years to come.

MM-151S: 190(W)X450(H)X250(D)mm
 
 Mr.S, Osaka Pref
 
March 2009
I'm S, a resident of Osaka.
Thank you for all your trouble when purchasing SSC coated MM-141S
and the Corian boards.

Is PIONEER PE-101A all right?
At first, I worried about it because the midrange didn't have the
thickness worryingly.
Now, it has been 1.5 months, the sound came out at a relaxed state.


SSC coated MM-141S with PIONEER PE-101A
 
After a sound begins to come out, the sound from PIONEER PE-101A
has become stronger.
It plundered MM-141S of the characteristics of Backloaded Horn
system.
For MM-141S, I should have chosen 8cm speaker driver.
But PE-101A (10cm) is my choice, I have no regrets because of
good looks.
They don't have the bass like a rumbling of the earth, but it has
amazing sound for 10cm driver.
I feel comfortable enough with a reasonable echo sound.
I enjoy brisk sound like full-range speaker driver.

I put an accompanying needle felt by half into the air chamber.
And also, I put Tozawa styled resonaters in accordance with your
advice.
 
Tozawa styled resonater
Tozawa styled resonaters
 
I began trial listening in series.

Doctor 3 "Jazzitaliano live2007"
Keith Jarrett "Yesterdays"
Sound spread and sound echo are great.
And it has very realistic sensation, too.
It makes me think that the speaker was born to listen to jazz.
Live instrument is so real, and it has a voluminous bass.

Laura Fygi "The Very Best"
It played her vocal voluptuously.
During singing, I was amazed by the sound of the saxophone.
I heard it like the player is performing in front of me.

I listened to the various sources without a break from comfortable sound.
Emi Hayakawa "You and Me and Jazz"
Eden Atwood "Waves The Bossa Nova Session"
and all that.

I felt no strength in classical music as is to be expected.
But I got sleepy while listning by echo sound of live instrument.
That's good, too.

Kumi Koda "TRICK"
When I first assembled, it was underscored with bass and the singing
voice was hiding. It was intolerable sound.
Now the singing voice comes out forward and the balance had
improved. But this kind of music doesn't suit it.
Of course it can play some of J-pop with a refreshed feeling.

Finally, I listened to much-loved The Beatles.
I could listen to it at full.
I felt vividly even the recording of the 60's, and more listenable it
than Kumi Koda "TRICK".

Usually, I use SONY multichannel integrated amplifier TA-DA3200ES.
But Victor 2-way bass reflex speaker system SX-M3 drives by marantz
integrated amplifier PM8003. I contrasted with PM8003 once.
I felt the difference between the characteristics of both amplifiers,
but surprisingly, voluminous sound is not so different.
I thought big differences occur in the sound.
If anything, the tone color of marantz with a sound spread and echo
suits my SSC coated MM-141S better.

I studied product reviews carefully before buying with an open mind.
My mouth splits open with better-than-expected results.
That's low-skew high-resolution sound, and I could feel centering
localization, too.
Under such condition, it has a sound spread and echo.
The sound soothes listeners.
It still makes full use of the abilities because I'm just getting started.
But surprisingly, they balance MM-141S with PIONEER PE-101A.

MM-141S: 160(W)X450(H)X250(D)mm
 
PageTop
 
 Mr.Ishikawa, Iwate Pref. 
 
March 2009
I know you're busy.
I fell in love with Monacor SPH-30X at first sight, and imported.
I reworked MDF baffle boards before the arrival of SPH-30X.

I mounted it on MM-151S, it was baseless lightweight sound.
MM-151S may have been oversized box for Monacor SPH-30X.
But I could feel the good origin of SPH-30X.
I listened to some CDs. I heard the shiny tone of the high-tone range
such as a vocal, a piano, a violin and cymbals.
The problem is a bass tone.

I believe it needs an aging in megavolume.
So, I carried the MM-151S to a coffee shop, and bring our friends
round and have a preview of the MM-151S.
On the previous day, I aged the MM-151S at full blast for about
an hour with a shop proprietor.
Then, a bass tone came out as hard as it is to believe.
Our friends will be surprised at just a 7cm speaker driver.
 
MM-151S with Monacor SPH-30X
The preview of MM-151S with Monacor SPH-30X
 
We held a preview of Hasehiro Backloaded Horn Speaker over 4 hours.
We listened the sound of Monacor SPH-30X and CSS FR125S by
MM-151S.

SPH-30X
Monacor SPH-30X
It brings unusual shiny tone, regardless of the audio source when
listening to solo music.
It is springy and shining tone with clear-cut sound.
Is it Kevlar cone sound?
We listened raptly to the shiny tone for the initial period of time, but
the shiny tone stands out by degrees.
Listening to symphony, it loses texture of a dynamic playing part of
brass section and female chorus when treble part is coming.
It needs an aging more.
But the diaphragm of Monacor SPH-30X was terrific motion.

FR125S
CSS FR125S
We, all five gave it a loud ovation.
FR125S was absolutely magnificent.
Usually, the shop proprietor listens to the sound of JBL 4344II
(see a photo), and he praised to the skies.
 
MM-151S: 190(W)X450(H)X250(D)mm
 
 Mr.K, Osaka City 
 
December 2008

I had been using CORAL BETA-8 on MM-191T.
But I damaged a voice coil of BETA-8 through my
own carelessness.
So, I thought I take this opportunity to replace
BETA-8 with another driver.

I considered some drivers such as LOWTHER,
Electro-Voice and FOSTEX, but I want to

CORAL BETA-8
BETA-8

attempt at novelty like a car stereo speaker.

Eventually, I bought KEF flush-mount speaker for home theater
Ci160.2QR, and mounted it on MM-191T.
It is coaxial 2-way speaker (16cm). MM-191T places a plentiful load
through the long exponential curved horn, so it plays music with
a deep tone. Contrabass and pipe organ are great.

I report this as unforeseen example.
 

MM-191T: 310(W)X900(H)X450(D)mm
 
MM-191T with KEF Ci160.2QR
MM-191T with KEF Ci160.2QR
 
 
 Mr.Kurotani, Shizuoka Pref.
 
October 2008

I built a tube amplifier VP-3488SE (pictured right) in August,
and I was listening to music on a 2-way (38cm and horn) large system
in my listening room.
I was absolutely-fascinated with the sound of a tube amp.
I want to hear the sound in the living room all the time.

There are self-produced zelkova-made 20cm coaxial 2-way speakers
(pictured center) in my living room.
I was satisfied almost flat sound of 50Hz to 20kHz, but I learned of
Hasehiro backloaded horn speakers on the Internet and want to buy.


MM-161T with JX92S
MM-161T with JORDAN JX92S
 
I was surprised.
MM-161T with JORDAN JX92S is almost the same low tone as 38cm
driver.
MM-161T makes unbelievable low tone, it's only 12cm driver.
Recently, I built the 2nd tube amplifier 10W+10W (pictured left).
It can also drive MM-161T with JORDAN JX92S.
 

MM-161T: 220(W)X900(H)X450(D)mm
 
 Mr.Mochizuki, Shiga Pref.
 
September 2008

e-mail from him

A month have passed since I started listening the sound of MM-191T
with FOSTEX FE208ES-R.
 
FE208ES-R
FE208ES-R
 
I tested repeatedly, either increased or decreased the sound
absorbing materials and the resonators.
Nevertheless, the undertone is not like what I expected.
It play only a weak sound.

I want to play the heavy deep sound.
I'd like to know about the relationship between the sound and the
sound absorbing materials or the paint application.
Please advise me.

e-mail to him

FOSTEX FE208ES-R is great driver in terms of resolution and sense
of speed because of low Qo.
But I think it has trouble with the heavy deep sound.
If you paint them with
SSC compound, the undertone become strong
with bright clarity.
But it will become poor performance in the present condition if you
paint them.

I'd suggest that you increase the capacity of the air chambers by our
upgrading parts.
Please remove one MDF boards from one MM-191T, and add its MDF
bords into other MM-191T on trial.
In that case, the fastening screws can't reach the opposite side.
So, please tape temporarily with adhesive tape.
The width of the front baffle board is short, too.
So, please put in a piece of wood into the space between the front
baffle and the side baffle board.
Please preview the sound in only one side.

If it still give a poor sound, please replace FOSTEX FE208ES-R by
FE206E or F200A.
Please let me know if you make status of progress.

e-mail from him

I received the upgrading parts to MM-1111T. (2-grade increase)
I brought the front baffle boards to a do-it-yourself home center, and
I had the pilot holes drilled. (@JPY21x16)

They need only a little sound absorbing materials.
Grew in the range, the sound became mellow and improved the
efficiency.
The low pitch sound comes along for the ride with a piano, a guitar
and a voice without equalizer correction because the mid-low
pitch sound near hundreds of hertz has momentum.
Separated sound (left, center, right) gathered in the center.
Everything became better than before.

I'll paint them in this autumn.


MM-191T: 310(W)X900(H)X450(D)mm
MM-1111T: 370(W)X900(H)X450(D)mm

 
 Mr.K, Kanagawa Pref
 
September 2008

One year has passed since I bought MM-191T.

MM-191T plays with perfect harmony when I mount Japanese driver
such as FOSTEX F200A.
But when I mount LOWTHER PM6A, it doesn't play with perfect
harmony.
It makes a slip of the sound. In other words, it has a light sound.

PM6A
PM6A

I made all kinds of efforts, for example, I got the horn longer than the
original by increasing the divider plates, but I couldn't do anything
about it.

I was almost ready to give up, but I remounted the baffle boards with
LOWTHER PM6A upside down from sudden random thought.
To my surprise, it took an adequate load and became well-balanced
natural sound. It's so small a matter.

Now I am intoxicated with an electrifying sound of LOWTHER PM6A.
The other drivers don't have a next chance anymore.
People have different tastes in sound, and it varies according to
conditions.
But I thought this is one way to take advantage of LOWTHER PM6A.
So, I reported this as an audiophile.


MM-191T: 310(W)X900(H)X450(D)mm
 
 Mr.Ono, Gunma Pref.
 
July 2008

Today I received the front baffle boards for PARC Audio
DCU-F121W (10cm).
And now, I am enjoying the sound of the new MM-141S.

DCU-F121W
DCU-F121W

I enjoyed the sound of DIY Audio SA/F80AMG (8cm) with MM-141S
for 2 years, but I wanted to change the diameter of drivers for
MM-141S when I listen to the sound of MM-131SS (8cm).
I thought MM-141S is a little small to DCU-F121W, but it was not bad sound.

I'm looking forward to an acoustic tuning of self-satisfaction, while
aging DCU-F121W.
A complete different speaker with just purchase additional front baffle boards, and it can also change back to the original drivers.
I find your revolutionary breakthrough quite impressive.

Thank you for your MM backloaded horn.

MM-141S: 160(W)X450(H)X250(D)mm

 
PageTop
 
 Mr.I, Hokkaido 
 
February 2008

(He mounted ALTEC 755E on MM-191T.)

It has been 10 days since I bought MM-191.
I'm running out of adjectives to describe, that's high-quality sound.
I felt both surprise and sensation because I've underestimated the
full-range speaker driver.

Usually, I listen to jazz and baroque music.
I get involved in a realistic sound and forget the passage of time.
I really appreciate to meet a good things.

It didn't take much time for me to assemble the MM-191T.
I thought the buyer should make the pilot holes for insertion of bolts in
the baffle board before assembling as noted in the detailed assembly
illustration.
That's a point well taken because of hard MDF board.
I retightened the screws on several occasions from the very beginning.
To my surprise, obviously,
the sound quality has improved each time and every day.

MM-191T: 310(W)X900(H)X450(D)mm

 
MM-191T with Altec755E
MM-191T with ALTEC 755E
 
 
 Mr.Ito, Saitama Pref. 
 
November 2006

(He purchased MM-161 for subwoofer box.)

Thank you for your arrangement for MM-161 for subwoofer box and
SCAN-SPEAK 15W8831G00 midwoofer.
I will report on the present situation in the subwoofer.

15W8831G00
15W8831G00

I made a channel divider (-24dB/oct) based on electronic circuit
diagram on the Internet, and I set up the system for 2.1ch.

Under my plan, I was supposed to paint the SSC compound and bond
with two-component adhesive in one sitting.
But when I purchased MM-161, the six-ply full width was 182mm
because of steamy summer.
Today, it is about 178mm, so I can do the work but I don't have
enough time.

And I have a problem in selecting the cutoff frequency.
It seemed like it creates the peak value around at 100Hz because my
acoustic tuning such as sound absorbing materials is not well yet.
So I have set the cutoff at 80Hz now.

Thus my own subwoofer remains in a state of trial fitting.
But it has a powerful effect on my sound.
When I only play the MM-161 subwoofer, I don't get a word of what it
is playing.
However, naturally it lends weight to the musical composition.

I can feel its trend even weak bassy source such as guitar solo.
Now, I use SCAN-SPEAK 15W8831G00 within a narrow range.
That's a audio life of luxury or a waste...

MM-161: 220(W)X450(H)X410(D)mm

 
 Mr.Tsuda, Aichi Pref.
 
November 2006
The present my system is MM-161 with Tang Band W4-657SC after
all sorts of troubles and difficulties.

Firstly, I bought MM-151 for 10cm drivers from you.
Speaker drivers were for backloaded system made by FOSTEX.
But the speaker drivers needed MM-161 for 12cm drivers.
I ordered MM-151 by mistake due to a lack of attention.
I hurriedly bought the upgrade parts to MM-161 from you and
assembled.

But the sound was the worst.
I thought that whatever I tried, nothing was going to my favorite
sound.
I have got Tang Band W4-657SC on hand.
So I changed the speaker drivers to Tang Band W4-657SC.
It became refreshing sound without stimulating tone.
I felt motivated, so besides I bought the upgrade parts to MM-171 for 16cm drivers from you.
I have got 16cm drivers on hand, too.
I assembled that, but it didn't fit with backloaded system.

Thereupon I've been thinking of paint the enclosures.
I have got the impregnating coating material for wood deck on hand.
So I painted the whole surface with it.
I spent over 2 liters of the coating material for 2 enclosures.
I dried them in a week or so.
And I overcoated the outside and the horn with acrylic paint three
times, and assembled as MM-161 (with Tang Band W4-657SC).
MDF became so firm and the sound, too.
It changed to a fantastic loudspeaker system.

MM-161 with W4-657SC and TAKET BATPRO
MM-161 with Tang Band W4-657SC and TAKET BATPRO
 

Moreover, I became curious about the backloaded sound by 8cm
speaker driver.
I decided to buy Tang Band W3-1231SH titanium drivers.
And I ordered
SSC coated baffle boards, Tozawa styled resonaters,
etc. to you.

W3-1231SH
W3-1231SH

I disassembled the enclosures for 12cm drivers (MM-161) and
reassembled them for 8cm drivers.
Eventually, I got all parts MM-141 for 8cm drivers to MM-171 for 16cm
drivers.
What the hell am I doing?

Tang Band W3-1231SH titanium cone drivers were dynamic sound, but
I felt that the scale and the high-tone range were not enough.
Now I reassembled them to the first MM-161 with Tozawa styled
resonaters and Tang Band W4-657SC.
And I have added TAKET BATPRO as the super tweeter.
I listen to music with the super woofer depending on the music.
It play the great sound from pops to baroque music.
Karen Carpenter sings songs to me vividly.
Recently, I don't use much YAMAHA NS-1000M and B&W N805.

Tang Band W4-657SC aluminum cone drivers are refreshing sound.
I want to use the contrasting ALTEC speaker driver.
So I ordered the front baffle boards for it to you.
I really appreciate that you devised the unique system of MM series.

MM-161: 220(W)X450(H)X410(D)mm


MM-161
 
 
PageTop
 
 Mr.Nakamura, Tokushima Pref.
 
February 2003

(citation)

Unfortunately, I cannot enjoy music at full blast.
So, I was looking for enjoyable speaker even lower the volume.
My concern for low volume was that it become poor sound by weak
bass.
And it is blunt or coreless sound if it is voluminous sound.
(many large woofers like that.)

I chose 4 drivers from 10 to 16cm, Technics EAS-16F10, FOSTEX
FE108ESII, ELCY Electric LC-12S and Electro-Voice.
And I purchased MM-161T.
I was right!
I was so impressed that unclouded, backboned, voluminous and sharp
bass came out from MM-161T.
It seems like only the good points of the back loaded horn system.
Previously, I have been using the back loaded horn speakers D-37
designed by Mr.Tetsuo Nagaoka.
But D-37 couldn't give full play to the ability when low volume.
So, D-37 didn't meet my living conditions.
I think MM series is great because they have good-quality bass even
low volume.

From the start, I adhered 6 MDF boards with school glue.
I changed the internal wiring from associated cords to JBL speaker
cords, and eventually it was decided CARDAS cords.

LC-12S
LC-12S

Eventually, ELCY Electric LC-12S was the best to me among 4 drivers.
But the top notes of high-tone range don't come out from LC-12S with
MM-161T, so it needs tweeters.
It is usually the voluminous of mid-low-tone and low-tone range.
I am hoping to increase the voluminous, so I will increase the number
of its driver to 2 per channel.
The hardness of the mid-low-tone range is like JBL 4" driver.
Am I very much flattered...?

MM-161T: 220(W)X900(H)X450(D)mm

 August 2005

(citation)

I was using ELCY Electric LC-12S with MM-161T.
I upgraded its MM-161T to MM-191T to increase the number of its
drivers to 2 units per a channel.
I mounted two LC-12S up and down, it was great!
It played hard sound with a soft laid-back bass by different blowback
in the 2 drivers.
But I still was discontented with the bass.

So, I mounted 20cm drivers on MM-191T.
However, I sounded like capacity shortage of the air chambers.
At last, I upgraded its MM-191T to MM-2122T.
I was listening to music by its MM-2122T with FOSTEX FE208Eƒ°,
JBL D208, Technics EAS-20F100 and ALTEC CD408-8A.

CD408-8A     CF404-8A
CD408-8A             CF404-8A

I enjoyed music by ALTEC CD408-8A with MM-2122T, but I had a
particular concern to slackness of around 1kHz. (female vocal or violin)
So, I mounted ALTEC CF404-8A on the rear open boxes and I added
them without crossover network.
I listened to music without change nearly a year.
But I started worrying about the bass volume.

P10Q
P10Q

And so I changed to Jensen P10Q drivers (25cm).
I don't know the brand, but it is alnico magnet.
The frame is pressed steal and the edge remains cone paper.
Originally, it was real dog. Bass was good, but high note didn't grow.
The gamut was cloudy and somber sound.
But it was very sharp sound, and the rising time was much faster than
ALTEC.
It played only the guitar.
It was dismal.
My money went up in smoke...
I should have bought Celetion drivers...

After 3 months, I said "what a relief..."
It just took longer than I expected to the aging.
Even now, sensitive sound of the mid-high note is sluggish.
So, I adds ALTEC CF404-8A.

MM-191T: 310(W)X900(H)X450(D)mm
MM-2122T: 440(W)X900(H)X450(D)mm

 September 2006
(citation)

I used Jensen P10Q for 5 months.
Voluminous bass and sharp sound were utterly fascinating.
But I threw my hands up due to insufficient sensitive sound.

Therefore, I looked for a new driver under the following conditions.
1. 20 or 25cm.
2. Superior expressiveness of tone color.
3. Fine high-mid note, bass and full band even a single full-range
speaker.
Specifically, high-mid note has a sensitive expressiveness.
4. Dynamic sharp sound in the gamut.

FE206E
FOSTEX FE206E

High note reaches to breaking point without stress (power of subcone),
and bass is OK.
I didn't like the driver first because of ugly subcone appearance.
Sound is well that ends well.
Now, it seems like a pretty face.
But I sound weak and boring sound if its motion is less active.
So, I think a large air chamber is better to the driver to make its load
lighter.
I cannot expand the width of MM-2122T anymore.
So, I piled the other baffle board on top of the present front baffle
board. (two-ply front baffle boards)

Super8
Audio Nirvana Super 8

That's a wonderful driver.
The magnet is larger than FE206E magnet, and it is very sharp sound.
MM-2122T began to play with pleasure the sound of wind instrument.
It may be the best driver among 20cm drivers.
But it is necessary to do that the capacity of the air chamber is larger
than using FE206E.
So, I removed the sound absorbing materials from the air chamber.
Even so, it is my favorite sound ever.
Three-ply front baffle boards...?

MM-2122T special: 440(W)X900(H)X480(D)mm
 
 Mr.S, Toyama Pref. 
 
July 2006
Sachsenwerk has four different models in the marketplace.
Two are full-range speakers, one is 20cm field speaker and the other
is 22cm use of ferrite magnet.
The other two are 13cm tweeters, one is use of alnico magnet and the
other is use of ferrite magnet.
All of them are vintage speakers of the 1940's and the 1950's, and carried by the premium tube radio "Olympia".

The most famous driver is 20cm field full-range speaker, and many people say the speaker system with 2 or 3 of the driver per channel is
the greatest in all of the speaker systems.
I purchased 14 of the driver from the German city of Dresden at my
friend's request.
My friend picked over drivers from them because they have an
individual difference.
It was deeply-moving tone for him, so he would try to make the system using the 3 drivers per channel this summer.

Field speaker needs DC power supply for its electric magnet.
So it's too much of a bother.
But some day I want to listen to the sound on WCW or MM Backloaded
Horn System.
I got hold of 2 of Sachsenwerk 22cm full-range speakers using ferrite
magnet, and it is decidedly rare speaker compared to Sachsenwerk
20cm field speaker.
The sound makes my heart melt even it plays naked.

CORAL 6CX-501 and Sachsenwerk
MM-161T with CORAL 6CX-501 and Sachsenwerk
 
MM-161T mounts CORAL coaxial 2-way speaker 6CX-501, but I
removed the wire connection to the tweeter.
Instead, I use Sachsenwerk 13cm cone tweeter across a capacitor
of 3ƒΚF.
I exchanged the advantage of point sound source of the coaxial
full-range speaker driver.
This was because I get the most wonderful, the world's greatest and
one and only mid-high Sachsenwerk 13cm tweeter to sing.

The mid-low range of CORAL 6CX-501 and the MM Backloaded Horn
Sound are excellent.
I also impregnated the baffle board for Sachsenwerk tweeter with
SSC compound, and it had great effect, too.
It smells agreeably of a sense of reality and depth, a stereoscopic
effect, a persuasive power and the luster.
But the sound forces nothing on the listener.
It has a sense of tension but doesn't give tone to me.
I think this is the effect of a high-quality bass tone from Hasehiro
Backloaded Horn.

The most distinctive feature of MM Backloaded Horn Enclosure is
that the owners can easily enjoy many sounds by replacement of the baffle board.
And it brings a lot of enjoyment to me if its driver is not designed to the
Backloaded Horn System.
My MM-161T went through a transition, it began with ELCY Electric
LC-12S and my next selection was FOSTEX F120A.
Now it's CORAL 6CX-501 but I make arrangements try some drivers.
They are German vintage alnico drivers of the 1950's;
SIEMENS Klangfilm 6 Ruf lsp 13g, TELEFUNKEN, EPW NEURUPPIN,
Stern-Radio and EGW.
I will play them with Sachsenwerk mid-high tweeter.
Back then, they made with high efficiency, so they are meant for
vacuum-tube amplifier.

MM-161T: 220(W)X900(H)X450(D)mm
 
MM-161T
 
 August 2006

(citation)

I really felt I had to write.

I mounted SIEMENS Klangfilm 6 Ruf lsp 13g on MM-161T.
The drivers are medium-term models with VAC alnico magnets and
orange labels.
They are medium-term models, but they were produced in transition
from excitation to permanent magnet model in the early 1950s.
At the time, they mounted on tube radio.
DCR is about 6ƒΆ, the efficiency is very high.
Sufficiently-strong alnico magnet, infinitely-thin lightweight cone paper
and aged deterioration-free edge.
That's full-range speaker driver for tube radio.


Klangfilm 6Ruf lsp 13g
SIEMENS Klangfilm full-range 6 Ruf lsp 13g
  
I mounted them on the SSC coated front baffle boards.
At first, I uncoupled the mid-high connection of Sachsenwerk and
heard the sound a little.
I connected its mid-high connection and switched the capacitor to 2ƒΚF
for the lack of the upper side.

Oh! Great!

I felt perfectly natural to connection with Sachsenwerk tweeters.
Buoyant good-quality low pitch sound.
Highly concentrated sleek and rich midrange.
I can feel an air from Sachsenwerk on the high-tone range.
My compliments.
There's no end of melody and dynamism.
I am swayed by the sound.

It took 1.5 years of twists and turns to provide an adequate selection
of quality SIEMENS Klangfilm.
Experience shows that German vintage speaker must not mount on
any box.
It doesn't fully display the positive attributes even open back enclosure.
It exert its potential to the full extent at plane baffle.
German vintage speaker is vibrating system, so it has blowback in
extreme detestation.
But German SIEMENS Klangfilm doesn't have a problem to Hasehiro
MM series (MM-161T).

Hasehiro MM series has unlimited potential.

MM-161T: 220(W)X900(H)X450(D)mm
 
Fresh voices second  third
    
Past voices on DIY kits for MM series
 
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