I took two $5 amplified speaker sets, ripped out the amps, and put them in a project box. It cost me about $15 total and they sound good. The THD is 0.2%, which is not bad for a $5 speaker set. I had to add 10k pull-ups after the output coupling caps to keep my stock VW amp turned on. The only problem is ground loop noise. I used the RCA outs as the ground for the amps, and that helped. It seems there is current ripple on the DC input to the Empeg, hence the hard drive noise through the ground lead. Are there low-Z caps on the input to the switchers? I may modify my Empeg harness to add a lower impedance ground wire. Has anyone tried this? In reality a differential input for the amps would be best.


Speedy