Jean has sent the below
He has built the HPD 385 (first generation, not the A-type)
15' Dual concentric's in 200 L enclosures.
They are closed, air tight cabinets made of waterproof plywood.
The crossover filters are also first generation HPD filters.
He has modified the crossovers as explained below.
The crossover of the HPD 385:
© Copyrights Hans Hilberink & Jean Croux, 2003.