preamp necessary?

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One simple way to do it is to add the balance control to the top of the volume control. Dual pot with the same resistance as the volume pot, but linear instead of log. Then arrange wiring so the balance control adds resistance to one channel as it reduces on the other. Roughly, this gives you a +-3dB variation on each channel. Ought to be enough unless your room is a very strange shape.
 
This is what I mean.
 

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