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projects

horn speakers

tqwt

TQWT plan with industrial sewer tubes
TQWT plan with additional resonation pipe in order to equalise bass response
measurements of TQWT (debate with Jack Egidijus at Full-Range Driver Forum): tapered 1/2 wave tube with stuffing proposed by David B. Weems (through Jack) and ussual stuffing of TQWT. Note: Measurement taken with RS Spl meter, correction for C weighting not aplied
single unit loudspeakers
Single unit fullrange loudspeaker with RadioShack unit

front panel is prolonged to avoid unnecessary speaker stands

multilple arrays
This loudspeaker (TQWT) contains 4 ultra cheap Conrad Electronic 3" fullrangers and one Motorola piezo tweeter (cost for all units is approx. 30 US$). The only real drawback is lack of bass.
other speakers
Classic 3 system loudspeaker with Scanspeak drivers
Series of classic loudspeakers
other devices

record player

high efficiency drive units
high efficiency drive unit with exponential aluminium cone