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kb1gtt · 05-22-2007, 05:06 AM

I connected an isolated power supply to my left front speaker - and ground, then I found the amp turns on at +3V and off at -.5V. Current draw was less then 10ma. I suspect the -.5V may be caused by some voltage on the ground wires, perhaps increased as age increases resistance, ect. Any one experimented with a means of putting a slightly negative signal on the wire to make sure the amp turns off? The ground loop isolator may offer a means of doing that with an inductive spike.

2001 Jetta 1.8T AWW

05-22-2007, 05:06 AM	#53
kb1gtt Newbie Join Date: May 2007 Posts: 6	I connected an isolated power supply to my left front speaker - and ground, then I found the amp turns on at +3V and off at -.5V. Current draw was less then 10ma. I suspect the -.5V may be caused by some voltage on the ground wires, perhaps increased as age increases resistance, ect. Any one experimented with a means of putting a slightly negative signal on the wire to make sure the amp turns off? The ground loop isolator may offer a means of doing that with an inductive spike. 2001 Jetta 1.8T AWW Last edited by kb1gtt; 06-10-2007 at 11:11 AM.