If you have slightly different gains, the amplifier won't be exactly balanced. You need to make absolutely sure that the gain of the inverting half is exactly the same as the gain on the non-inverting half. Otherwise one side will be pushing harder than the other. While this will still work, it won't sound nearly as good as a perfect balance.
Cheers,
Zach
Cheers,
Zach
If you get the resistors unmatched to tolerance and your using servos, the servos will have to work harder than they should to balance the output or prehaps fail to balance the output so that no current flow between the chips needless wasting output power. If your not using servos then there will be current flowing between the paralleled chips wasting power to the extent of the mismatch.
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