A-290 Wood Horn


Yellostone National Park, WY, USA (Photo by Yuichi)
A-1K Horn Specifications

= Horn Type : Hyperbolic horn
= Cut-off frequency : 900Hz
= Frequency range : 1200Hz to 20KHz
= Driver : 1 in or 2.5 cm throat Pioneer TAD 2001 or equivalent
= Size : W 255mm, H 185mm, D 158mm (inclu. 25mm throat adapter)
= Material : a Teak laminated lumber (3.0cm thickness)
= Finish : Teak oil

= Color : Not applied
= Others
- No fin

....Jul. 1992 MJ Magazine....
Building and assembly process

Transfer template on a
laminated lumber by pencil.
Cutting of the lumber by
a router using template
Bonding process of two
pieces
Adjustment of joints
Curving process by a
electric hand plane
Verification and adjustment
of joints
Verification of side
alignment among three
pieces
Application of epoxy glue
and filler (12 Hrs to cure)
Application of epoxy glue
and filler (12 Hrs cure)
Completion of the horn by
applying oil finish.
(Top view)
The horn and the driver
adapter


Measurement and Data


Left hand data is A-1K frequency response curve.

Pioneer TAD 2001, 1 in throat,
driver is mounted.The response
shows very flat sound pressure
level from 800Hz to almost 20KHz.

This horn with TAD 2001 or
equivalent driver covers higher
frequency range in two way system. However,
high frequency response depends upon the driver capability.

It is a good idea to set the crossover frequency in
between 1.2 or 1.5KHz.
Left hand data is a directivity curve at 1 KHz.

This data shows that the horn system provides reasonable service area in front of the horn.

It is also good that back side of
-67.5 to +67.5 degree zone has less output. This means that reflection from walls of a room is minimized.
This effect is one of the advantage
of horn systems.



Right hand data is a directivity curve at 5 KHz.

This data shows that the horn system provides reasonable service area, -30 to +30 degree, in front of the horn.

It is also good that back side of -45 to +45 degree zone has very small output. This means that reflection from walls of a room is minimized. This effect is one of the advantage of horn systems.

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