• Item: 3-WAY ALL-JBL HORN SPEAKER  
  • Type: 1500AL + 2450SL-Be + radial horn + 045Be-1 + radial horn  
  • Posted: 31 January 2019  
  • Builder: marco_gea  
  • Country: United Kingdom  
  • Comments: 0  

Richard's new speakers

* THIS PROJECT IS STILL WORK-IN-PROGRESS.
I WILL UPDATE THIS PAGE AS THE BUILD PROGRESSES *


WOOFER: JBL 1500AL (15", AlNiCo magnet, cellulose diaphragm, SFG, double damper)

WOOFER BOX: Bass-Reflex, Vb = 120L, Fb = 32Hz. Made out of birch plywood, extensively braced.

MID: JBL 2450SL (4"-diaphragm, 1.5"-exit 'throat-less' compression driver, Neodymium magnet, 'Coherent Wave' phase plug) + Truextent BeX4008 Beryllium diaphragm

MID HORN: My own design, inspired by Yuichi Arai's work.
Radial hypex expansion, Fc = 320Hz, T = 0.7. Made out of birch plywood, with CFRP throat adaptor.

TWEETER: JBL 045Be-1 (1"-Beryllium diaphragm, 1cm-exit compression driver).

TWEETER HORN: My own design, inspired by Yuichi Arai's work.
Radial hypex expansion, Fc = 2kHz, T = 0.7. Made out of marble powder + resin.

PASSIVE CROSSOVER: My own design, inspired by Shozo Kinoshita's work.
Crossover frequencies are 700Hz and 7kHz.
6th-order Woofer Low-Pass; 2nd-order Mid Band-Pass; 2nd-order Tweeter High-Pass.
Mundorf coils and Jantzen capacitors.
Mid attenuated with Someya autotransformer.

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