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. . 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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