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SEE-THROUGH HORN SPEAKERS
Development Inside
Story |
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Hasehiro had received
requests mainly from young
adults for it very often at
the Audio Fair.
That's a smaller speaker for PC than MM-S
type.
(Minimum MM-S type is MM-141S, and the size is
W16
x H45 x D25cm.)
But commercial PC speakers are
quite inexpensive.
So, Hasehiro hesitated to
produce the smaller back
loaded horn
speaker experimentally.
Will it play low-tone range
even a short horn...?
Hasehiro designed it as about
two-thirds the size
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MM-141S
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of MM-S type. (That is W12 x H35 x
D19cm.)
Such size
can put it on the table and it doesn't provide a sense of
incongruity if put it aside
of PC. |
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|
Hasehiro completed their first desktop
speaker UMU-131SS and he
mounted DIY Audio SA/F80AMG
on UMU-131SS.
Hasehiro inserted CD into the CD drive of PC,
and he drived it by
own small digital amplifier
immediately.
First, he listened to bossa nova by
Jacintha.
Floaty her voice, wind of saxophone blowing
through the space and
brilliant piano; UMU-131SS is
open and realistic sound quality in her
own
right.
Hasehiro changed the speaker driver to other 8cm
drivers, but it
became languid sound from lack of low-tone
range.
It seemed UMU-131SS has good chemistry with DIY
Audio SA/F80AMG.
Anyone can enjoy dynamic 8 beat
bass if the drivers are DIY Audio
SA/F80AMG,
and that is magna-guard video shielding
design.
UMU-131SS is a reasonable feeling of the
massiveness of sound and
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LS: MM-151S
RS: UMU-131SS
(prototype) |
the low-tone range compared
with MM-151S.
But
maybe that's just as well
if the owner listen to music
while
operate a PC.
Above all, UMU-131SS has
a
beautiful sound.
Hasehiro got into the sound.
He always
heard the song called
"Ashita" by
Ayaka Hirahara when
he operate a
PC. |
This song is so dolce music of an unhurried
singing voice with clear-cut sweet notes of a
harp.
UMU-131SS played realistic about the vibration of
tight harp strings.
Visitors said "Is the
sound from a PC?!"
It was hollow
note like harped with gloved fingers when they hear this song
through closed-box small speakers with the same
SA/F80AMG.
Hasehiro's first desktop speaker UMU-131SS was
completed. |
Hasehiro understood
to enjoy even smaller backloaded horn speaker as home
audio.
The undertone was deeper than Hasehiro thought, and
the appeal
of UMU-131SS is its sense of speed and its
breeziness.
Hasehiro came up with a unique idea
one has cherished for many years once
again. |
Hasehiro completed
see-through
backloaded horn speaker.
Anyone can
enjoy the exponential curve, too.
The side baffle
boards are clear
acrylic board 10mm thick,
and Hasehiro
bonded with
a transparent bond.
Hasehiro had
this idea since olden days, but acrylic board is costly so he
couldn't use it to their previous big
speakers.
Hasehiro had a tricky issue.
That's
glimmering transparent
bond scars.
They glimmer like
luminous paint
if looked at from different angles |
glimmering transparent bond scars. |
| by refraction of light. (See the
right photo.) |
|
 |
Hasehiro looked for the dissoluble
bond
through professional company,
but he couldn't find
it.
He tried a transparent double-stick tape.
But it
also glimmers and lack of adhesion strength.
What
a pity!
It's too roughly made if he bolt the side
baffle
boards up.
Because the side baffle boards are
clear
see-through boards.
Gilded bolts and nuts are
stylish...?
Lack something... |
Hasehiro
found the amazing thing in a storehouse of a
screw
wholesaler, and he decided to make the second
prototype once again.
by a different color...
based on the color of
iPod... |
|
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