What may affect noise floor? The gain of the preamp and amp with regard to sensitivity of the speakers. It can reveal noise in the upstream components. May not be a problem with the right cartridge choice.
And of course, the amount of noise on the AC line coming into your house. Has this ever been noticeable before, and do you use any power conditioning?
And of course, the amount of noise on the AC line coming into your house. Has this ever been noticeable before, and do you use any power conditioning?