Relay holding amp back?

i have an older alpine amp (3546) and the turn off circut doesn't work so i installed a relay int he power wire and now it seems like the amp doesnt hit like it used to before the relay.

i was wondering if a 40/30amp relay is the problem and if i could just go to a bigger relay and fix the problem or is there something else that i could do?

Are you running the power through a relay because the remote turn on circuit is fried and the amp stays on otherwise?  If so, I'd recommend scrapping the amp.

If for some reason, you can't seem to convince yourself to do that, you need to use a relay that can easily handle the current demands of the amp, like a battery isolator.  If you're trying to draw too much current through a typical Bosch-type relay, then the contacts can easily fuse over time, and the amp will again stay on constantly.

A relay (or a fuse or a power wire) cannot "hold the amp back."  An amp will draw whatever it needs to draw until it fries the relay, blows the fuse, or burns up the wire.  Or until the vehicle's electrical system cannot supply enough voltage and current to support it.

Like was asked above, if there something wrong with the amp?  Then that's your likely "problem."