I think this is worthy of it's own little thread! Finally got around to building this project. Didn't want to rush and **** anything up so took about a month to finish. 12mm BB plywood, an extra 4mm glued and cut to size for the speaker panels to allow for rebating the drivers and using captive nuts. 460mm X 200 X 200. I'd planned to use a Dayton 215 8" passive with the Tang Band W5 1138 sub but I went with the SB Acoustics SB15SFCR-00 5'' x 8'' Passive Radiator as the racetrack shape allowed for a low profile enclosure rather than the briefcase shape. Mids and highs provided by a pair of defunct Tang Band W4 937sf coaxials sourced on Ebay. Built-in crossovers! The dome tweeters were extremely vunerable but luckily, I had some 4" Chinese grills from a previous project that fitted perfectly and held in place with the magnetic attraction of the speaker motors. Handy Harry! I used 5" PVC duct for the mid high enclosures made rigid with a stepped end cap routed from 2 circles of 6mm ply and glued into a groove cut into the back of the baffle. Butyl sound deadening sheet around exterior and carpet underlay and wool fiber damping for interior made for nifty dead enclosures with low displacement within the main box. I used the popular 2.1 TPA 3116 based Chinese amp module with built in bass crossover and level adjustment for lows and highs. Very flexible and quiet in operation. Bit of a faff mounting it so controls were accessible. Ended up making a panel with black Perspex and 4mm plywood with cutouts in a rounded over slot on the side. Exterior covered with fake leather vinyl and funky blue pearl vinyl wrap for speaker panels. I tuned the passive using 1hz test tones to approx 36hz with 40g added. Battery power from a Chinese 24v 6ah has lasted 6 days (20 hours+) so far! Sounds pretty decent too!
Attachments
Last edited:
Great looking build,
You have made solid cabinets and some nice choices for the midrange cabinet. No wonder you are happy.
You have made solid cabinets and some nice choices for the midrange cabinet. No wonder you are happy.
Hi Wolf, the SB passive is fine 99% but during testing, it ran out of excursion with a 35 Hz test tone, the amp near maximum. I like bass heavy music and it's not happened once with my normal program fully cranked. They displace 195 cc which seems great for the 1138.
