Home Speaker Asylum

General speaker questions for audio and home theater.

RE: Has anyone done this with a subwoofer




Hi airtime,

Your idea reminds me of my DIY stereo subwoofer project that's different than yours, but still thinking outside the box ;-)

I pulled the stock plate amplifiers out from a pair of KEF subwoofers, ordered two custom-fabricated rigid resonance-dampened 1/8" steel plates to cover the enclosures cut-outs, installed a stereo set of Edison Price Music Posts on the back panels in order to match my B&W loudspeakers binding post upgrade, upgraded the stock drivers, and replaced the four plastic feet with a set of three Madisound Tiptoe spikes.

The two stock plate amplifiers were replaced with a Lexicon (made by Bryston) stereo power amplifier, and an old-school Nakamichi mobile electronic crossover powered by an external Zerozone linear power supply. The crossover I/Os and power amplifier outputs are connected in full stereo for better low frequency soundstage and ambient information, and the original integrity of each stereo channel remains intact within the signal chain rather than summing the stereo signals, which I found to sound inferior, perhaps due in large part to inter-channel phase issues, among others.

Most notable to mention is the crossover and stereo power amplifier components are completely isolated from the detrimental effects of the subwoofer enclosures and drivers, including the magnetic influence of the driver magnets in close proximity to the plate amplifier circuits, which have always been downsides in my opinion when it comes to a plate amplifier affixed to the back panel of the most vibration prone audio device within a typical system.


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  Michael Percy Audio  


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