Exponential Curved Backloaded Horn Speakers
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HYBRID HORN SPEAKERS

HYBRID HORN SPEAKERS Development Inside Story

The First Concrete Horn

In about 1975, Mr.Imanari, the man was one
of audio nuts and director of invention school, introduced own invention at the floor.
That's the first concrete backloaded horn
speaker, cubed concrete, FOSTEX 10cm driver
and 2.5m long backloaded horn.
We were appalled to listen to the floor-shaking
tremendous sound from its opening.
Mr.Imanari called the concrete back loaded
horn speaker HoPe-I.

HoPe-I

Hasehiro requested the production to Mr.Imanari momentarily.
Hasehiro made a boast of the concrete backloaded horn speaker to
his friends.
One of his friends came to his house to listen to the sound, bringing
a record occasionally.
After that, Mr.Imanari got some orders by word of mouth.
But they take up to over 1 year from ordering to reception because he was hung up on new invention.
As a result, it went of mind of audio nuts by little and little.

Batonpassing

In about 3 years after completion the first concrete backloaded horn
speaker, Hasehiro thought, this is so wasteful that it has a
remendous amount of potential and anyone think of nothing to concrete backloaded horn and the making, Hasehiro told his
long-held aspiration to Mr.Imanari and he made a promise the tool passing and initiation of the technical know-how.
But before that, Mr.Imanari was taken with illness and passed away
after several months in a hospital.
His heart swelled with put that out into the market for answer to
the will of Mr.Imanari.

Hasehiro told the antemortem promise to the bereaved family, and
he received some undisposed tools from his son.
Hasehiro made trial model over and over imagining the making
process from the tools.

Study from Fabric

Concrete characteristic vibration harden the tone color.
So first, Hasehiro was starting to amelioration of concrete fabric.
He changed black cement to white cement and also he changed
aggregate and mixed in particular absorb sound chips.
As a result, Hasehiro succeeded to remove concrete-specific sound
character and could get the fabric know-how.

failed concrete

Pronouncement

In 1990, Hasehiro Audio submitted the model,
HoPe-II AX (discontinued) used 12cm driver to
The International Housewares Show. promotional leaflet in Japanese

After that, Hasehiro Audio submitted the succession model,
HoPe-II BX (discontinued) used 16cm driver to the exhibition and
they receive orders from after, too.

Challenge to Double-Layered Structure

Hasehiro had wondered for a long time making the upper grade
model used 20cm driver.
But it looks about 50kg from specific gravity of concrete.
So, it is difficult to distribute and had to give up.
However, one audio nut suggested the double-layered structure of
wood and concrete for not only weight saving but also think it should be a natural sound more add to wood sounding.

Hasehiro had a lot of trouble, cracks in the concrete when drying
etc. But Hasehiro could resolve that for technical guidance from
Onoda Cement Co., Ltd.

In 1997, completed the world's first backloaded
double-layered hybrid horn speaker with
ALTEC 409-8E:

WCW-200A (discontinued)
-Takes over the clear sound of the model of
    HoPe-II BX.
-More natural sound quality full of realistic
    sensation by adding to getting bigger and
    wood sounding.
-The sound pressure notched 96dB
hybrid horn

Submission to The 4th Vacuum Tube Audio Fair

In September 1998, Hasehiro Audio made a
presentation at The 4th Vacuum Tube Audio Fair in Akihabara,Tokyo.
The fair attract about 5,000 visitors of high
end audio nuts each time.

Hasehiro Audio exhibited the concrete back
loaded horn speaker HoPe-II BX and the

world's first back loaded double-layered hybrid horn speaker
WCW-200A.

WCW-200A got better-than-expected responses from visitors.
A lady at the reception desk misunderstood playing a live show in
the event site.

WCW-200A gold titled in eliminate tube amp category.

WCW-200A

the world's first backloaded double-layered
hybrid horn speaker

Submission to The Audio Expo '98

In October 1998,Hasehiro Audio made
a presentation at The Audio Expo '98
in Ariake,Tokyo.

Hasehiro Audio also exhibited the concrete back loaded horn speaker HoPe-II BX and
the world's first backloaded double-layered
hybrid horn speaker WCW-200A.

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