I once absentmindedly left my micro amp on for a week or two, and then I noticed some fuzziness in one channel which was made very obvious by the different responses in the left and right side when changing the volume.
The very helpful headroom customer service rep advised me that static charges can build up if the amp is left on, and this can cause this precise effect. By flipping it on and off several times and turning the volume pot up and down quickly, we were able to reset it.
Ever since then, I definitely try to turn it off whenever not in use.
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Home Rig:
Marantz CD5001 -> Headroom Micro Amp '06 w/Desktop Module -> [Sennheiser HD650 | Ety ER-4s (P to S adapter)]
Portable Rig:
CDs -> Grip @ ogg q7 -> iAudio X5L 30gig -> (Ety ER-4p | KSC75)
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