A-290 Wood Horn

Yellowstone National Park, WY USA (Photo by Yuichi)

A-10K Horn Specifications

= Horn Type : Hyperbolic horn
= Cut-off frequency : 2KHz
= Frequency range : 3KHz to 20KHz
= Driver : 1 in or 2.5 cm throat Pioneer TAD 2001 or equivalent
= Size : W 125.4mm, H 125.4mm, D 75mm (inclu. 20mm driver adapter)
= Material : a Chinese quince laminated lumber (3.0cm thickness)
= Finish : Two coats of oil based clear polyurethane varnish

= Color : Not applied
= Others
- Super short cut horn (Calculated cut off is 480Hz)
- No fin




...August 1989 issue, MJ magazine
Building and assembly process

Cutting out of 50mm x
55mm wood bars with
polished
Cutting wood a material
with 45 degree for 90
degree joints
Cutting out of four
pieces of horn element
Generation of inner horn
curves and verification
of joints
Assembly of four horn
pieces by applying epoxy
Completed a horn body
(12 Hrs to cure)
Forming of outer curves to
minimize sound reflection
Horn throat making on
a driver adapter
Completed horn body and
a driver adapter
Completion of a horn
with a driver mounted
Completion of the horn
with a driver mounted


Measurement and Data


Left hand data is A-10K frequency response curve.

Pioneer TAD 2001, 1 in
throat, driver is mounted.
The response shows very
flat sound pressure
level from 2KHz to almost 20KHz.

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

It is a good idea to set the crossover frequency
around 3KHz.

Left hand data is a directivity curve at 2 KHz.

This data shows that the horn system provides reasonable service area in front of the horn.
Main service area looks - to + 80 degree zone

It is also good that rear side of the horn has
less output. This means that reflection from
walls of a room is minimized.
This effect is one of an advantages of horn
systems.


Because of no separations is implemented in
the horn, a little concentration of sound pressure in the center is observed.


Right hand data is a directivity curve at 5 KHz.

This data shows that the horn system provides
a little sharp output. - to + 30 degree area is
a service zone.

Because of no separations is implemented in
the horn, more concentration of sound pressure in the center is observed.

It is also good that rear side zone has very
small output. We do not need to consider the
sound absorption process in rear side of the horn.

Left hand data is a directivity curve at 10 KHz.

This data shows that the horn system provides sharp service area, -20 to +20 degree, in front of the horn.

Therefore, we better consider the orientation of the horn in the listening space.

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