Does anyone have similar problem with Pass Amp?

It doesn't sound normal. Try reversing pre-outs. Does the left speaker make the low hum. I think you might be blaming wrong component. See an "audio troubleshooting guide."

Viggen has the right idea. Keep in mind all transformers hum to some degree. Some manufacturers pott them to reduce hum but that only creates a new set of problems.

Other than the suggestions above, this could be a problem with a component or a cable. If you can systematically swap connections from side to side one at a time, you might be able to find the source. Sean
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Thanks for all your responses. I've tried all combinations to isolate the "problem" but have narrowed it down to amp residual noise. If I remove all cables but speaker cables from amp to speakers I get a slight hum from right speaker. I tried swapping speaker cables left to right and right to left and problem remains the same side(right channel). It is not the preamp or any associated cables as I have tried all combinations. I as well isolated all ac cable from each other.My Pass X250 will have a slight residual hum from right channel but it is only noticable if I put my ear right up to the speaker and I was wondering if anyone else has experienced this with there amp and could it be normal? Thanks again

It is not normal and you should contact Pass Labs. There is obviously a difference in performance between channels in terms of gain and / or noise floor. Sean
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