Lets check the simple stuff first. Check the speaker calbes and make sure that they are both hooked up the same way. If you have colored cables, then make sure that both "red" (for example) wires are connected to the positive(+) terminal of the speakers. If you have one to + and one to -, you will get sound out but lose the bass. This is because the speakers will be out of phase. This is the most common cause of the loss of bass response.
If that does not resolve the problem, please check with headphones to confirm that the problem is with the amp and not the speakers. Update this with your results.
Thanks,
Dan
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