consider luminous audio axiom preamps(125.ish ea). would have to dial in each channel individually, but woulddo the trick.
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Peter, I believe the resistor would have the same effect at all levels within normal operating ranges. Algebraically, you could use the following two relationships to demonstrate this in a "pure" system: Power equals voltage multiplied by current and voltage equals current multiplied by resistance. Remember, we are increasing the resistance when we add the resistor, and this doesn't affect the amp's output power but does reduce the power to the speaker.