I snagged it because it just because it's an old school amp. Is there any info or specs at all about setting the bias on the amps? It's hard to trace the PCB with the black mask on there. I did measure the voltage drop across the 3 big grey resistors and two sets out of the four are different. Here'...

I snagged it because it just because it's an old school amp. Is there any info or specs at all about setting the bias on the amps? It's hard to trace the PCB with the black mask on there. I did measure the voltage drop across the 3 big grey resistors and two sets out of the four are different. Here'...

I paid 50.00 out the door, so not a screaming deal. Yeah, the little PS is just more convenient then pulling out amps out of my truck for testing with no load. Although this amp must pull a couple of amps just idling. I'm wondering if the trimmers themselves are maybe a little dirty. And are they fo...

I should of specified, yes those numbers are for dcmv.

Well I measured the DC offset on the four different channels and came up with:
LF -3.35
Rf 5.00
LR 0.98
RR 16.55

I'm testing it using a little 3.0A 13.8vdc regulated PS I have.

Are these values normal on these amps? I debating whether or not to take it back to the pawnshop for a refund.

Hello everyone, first post on the site. I picked up a XS 4300 in a pawnshop the other day and was testing the outputs AC voltage on my oscope and dmm. The outputs are putting out between 15.50 to 16.50 vac each before clipping with a 1khz test tone but there's about a volt difference between the 4 c...