Making a sub chip amp

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I'd need an amplifier for a subwoofer and I was thinking about making two sets of three parallel chips, bridged (LM3886 or LM3875).

I was just wanting to ask, is there any difficulties doing this, and do I need anything special than pots for offset adjustment?

I was thinking for an signal OP amp to invert the signal for the other side.

And what kind of supply voltages should I/could I use for this arrangement?
 

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