A-480 Wood Horn

Death Valley National Park, CA, USA (Photo by Yuichi)

A-480FL Specifications

= Horn Type : Hyperbolic horn
= Cut off frequency : 900Hz
= Frequency range : 1200Hz to 20KHz
= Driver : 1in (2.5cm) throat. JBL-2425 or TAD-2001 or equivalent
= Size : W 435mm, H 145.4mm, D 285mm (inclu. 25mm adapter plate)
= Material : a Chinese quince laminated lumber (3.0cm thick)
= Finish : Two coats of oil based clear polyurethane varnish
= Others
- No fin

October 1994 issue, MJ magazine

Building and assembly process


Coarse cutting of total
eight upper and bottom
plates
Rounding process of
horn mouth edge by a
table saw with sander disk
Forming of horn curve on
a side walls by a router
Completion of upper and
bottom plate
Forming of side walls by a
plane
Verification of joints
among bottom plane and
side walls
Bonding process of two
plates to make 6cm
thickness
Forming of horn curve
by a plane
Assembly process of the
horn
There is no fin exist
Application of filler Building of driver adapters


Measurement and Data


Data below are directivity characteristics at 1K, 5K, 10K and 20KHz for both horizontal and vertical directions. The reason why I display many data is that some of the visitors are interested in the directivity characteristics of the horn without fin (separator). However, sound pressure level is distributed fairly well to all front direction.
A frequency response curve is almost identical to A-480 horn. Please refer to A-480 section.


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Horizontal directivity characteristic (1KHz) Vertical directivity characteristic (1KHz)
Horizontal directivity characteristic (5KHz) Vertical directivity characteristic (5KHz)
Horizontal directivity characteristic (10KHz) Vertical directivity characteristic (10KHz)
Horizontal directivity characteristic (20KHz) Vertical directivity characteristic (20KHz)


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