left channel less loud then right channel

[TomJS]

Hey everyone, I'm back again with my NAD 3400. First a bit of background information. I always had the idea that the left speaker had less bass or volume than the right speaker so I checked with a DB meter on my phone and set the amp to MONO and it confirmed what I thought. Back when I did this test I had problems with both speaker cutting out for a millisecond so I brought my nad 3400 in for repair. I told him about the main issue with the speakers cutting out for a millisecond and also about the left channel having less bass. He repaired the issue but he said there was no difference in output between the channels so I accepted that a moved on thinking it was just a speaker placement issue because he had an oscilloscope so I thought he probably checked it with that. Now I got my grandmothers old Goodman speakers and I was testing them both in the middle of the room and found that the left channel still had less bass or volume. I already checked it isn't a phase issue. Could it be I have to align the amplifier as it says in the service manual? If so power amp alignment seems straight forward following the manual. A DVM I guess stands for a digital voltmeter, is that right? But pre-amp alignment I don't get what they mean with AC VTM's to pre-out, what is an AC VTM?

This is the service manual, https://www.vintageshifi.com/repertoire ... Manual.pdf

Thanks and regards,

Tom

[pompeiisneaks]

DVM - Digital Volt Meter

VTM - Vacuum Tube Meter

AC - Alternating Current.

They probably recommend a VTM because they have a needle that can show subtle bouncing and balance type testing whereas a digital can be a little less visibly sensitive.

You probably can still perform whatever it wants with a digital volt meter (nowadays mostly called DMM - Digital Multi Meter as they can do multiple things, besides just measure voltage). but it may be a bit trickier to get a perfect balance.

~Phil