If a person wanted to burn in a pre AND an amp at the same time, but didn't want to put up with listening to a CD on repeat forever, could you disconnect your speaker cables from the amp and then run a CD on repeat?
Use resistors. The "out-of-phase speaker" sugestion does not completely eliminate sound like "noise-canceling" headphones. Just be sure the resistors are 4 - 8 ohms (see your amp's specs), and rated adequately for wattage being fed.
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