Right match

Something is wrong. Do what tablejockey suggests. 

I was using luxman 505ux11 it sounds much better than the m8 preamp

Seems like a luxman preamp will be a better match.

http://www.luxman.com/product/#Control

@rucan65

What is your source? Are you using an output of a turntable connected to a line level in on the musical fidelity preamp?
Luxman has a built in phono stage…that’s the only explanation I can find other than your preamp is broken. 

I'm using the preamp not using the luxman anylonger

I get it. I was asking what your source is and whether or not you have your turntable directly plugged into the m8 preamp