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I had a 2.1 speaker set, which produced excellent (yes excellent) bass. But, due to defect in its IC, it produced sound only from left channel. Hence, I had to replace it with another spk set of same model and company. Now, this spk set is working alright except that bass reproduction is ZERO, in addition to a lot of humming inspite of isolating the power cables. Though both are of same make and have same components, yet why the difference in bass prod?

Does the problem lie with the IC? I have a couple of ICs of same make (TEA 2025 B). I can replace the IC if the problem lies there.

A call to all geeks and electronic engg. there!! Thanks in advance.
 
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