Workshop Bookshelf Loudspeaker for listening in the workshop
Description of this page
The Workshop Loudspeaker is a compact two way acoustic suspension bookshelf mounted loudspeaker, built from a set of cheap Jaycar bass drivers and a leftover pair of Sony Tweeters. This speaker is the mainstay for my background music whilst pottering around in the backyard workshop. The acoustic performance is more than adequate for fatigue free listening to FM radio.
The Workshop loudspeaker system was built to provide a reasonable background music source whilst I worked in the backyard workshop. This meant the design required a small footprint to fit on an elevated shelf with the other speakers undergoing testing whilst still being able to withstand A/B testing with other designs. The design is a small acoustic suspension sytems using a cheap Jaycar 5" Woofer/Midrange and a pair of Sony cone Tweeters extracted from a sad sounding stereo I dismantled.
Both drivers had the cones doped with PVA to prevent cone breakup, with the 2nd order Linkwitz Crossover contributing to the clean sound. I am not concerned about the two sections having different impedences, as any decent modern amp should have no problem handling this; the Workshop amplifier is a 30 year old Sansui AU-217. Crossover assembly was on a Jaycar CX-2605 Crossover PCB, using Jaycar off the shelf inductors and polypropylene capacitors. I stained the cabinet to great effect and used a decent set of speaker connector terminals on the rear panel.
Originally the sound was a bit harsh until I doped the drivers. After this the speaker came alive, and is surprisingly good for a system with a cone tweeter. The bass response does not seem lacking and the speaker has an overall balanced sound which has provided many hours of fatigue free listening.
Circuit for the Crossover Network