testing amplifier

[tcheb]

I'm trying to fix my sound system and am struggling with diagnosing the amp.

I've followed all the wiring and am able to get sound if I disconnect the amp and jump the speaker input and output wires at the amp connector (essentially bypassing the amp) I also validated that the amp is getting 12v.

I assumed that the amp is faulty so I bought another used one from eBay but I'm still not getting any sound.

So either both amps (my old one and the one I got from eBay) are faulty or there's something else I'm missing.

is there any way to test the amp?

[reelizmpro]

What is the year and model of your car? Which headunit are you using?

[tcheb]

it's an 86 325es and I'm using the stock head unit.

[reelizmpro]

Which headunit though? It should be an anti-theft unit. I'm curious if the headunit was swapped.

[tcheb]

it's the CM5905 Anti Theft Unit. I know it's been swapped but it produces sound.