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My Carvin Legacy has a half power switch. Can I just throw the switch without worrying about the speaker impedance?It depends on the circuitry used to drop the power to "half". Some amps do remove two of the 4 power tubes from the circuit [often by lifting the cathodes from ground] and that will require an impedence change. Others use lower B+ voltages, which does not require a change. Others again use triode/pentode switching on the output tubes, whcih does not require a change.
Which amp are you thinking of?
My Carvin Legacy has a half power switch. Can I just throw the switch without worrying about the speaker impedance?
Almost any amp will tolerate a 100% mismatch-not just boutique amps.Certainly any amp that has a 1/2 power switch that cuts out 2 of the tubes will. They wouldnt put a 1/2 power switch on an amp expecting guys to change the impedance every time they used it IMO. Heck,the 1/2 power switch on my Ultra is even on the front panel. BobMost of the boutique amps are overbuilt....so some mismatch isn't an issue. Rick