@avanti1960 1++ You are probably overloading the NAD which would result in the sound you describe. You really do not want a MM cartridge output higher than 5 mv. Avanti's suggestions are fine but probably more expensive than you would like. It would be less expensive to go for something like a Parasound JC3+ and a lower output cartridge like one of the high output Soundsmiths which put out about 3 mv.
A comparable phono preamp
I recently bought a rouge audio rp7 preamp my amp is a bryston 4b my turntable is a linn basic with an akito tonearm with a linn adict mm cartridge mounted to it.I would like to at a later time up date it with a MC cartridge. My speakers are a pair of dynaudio special fortys with a rel s510 sub woofer. Now my preamp has no phono section nor dose the turntable. The phono preamp I have sounds cold harsh and to bright. It is a NAD PP4 and I am using it because it is what I use to record vynal to digital with a USB out. I should of bought a phono preamp when i bought the preamp .Now I am looking for a phono preamp that will give me that warm natural sound I am looking for. Can anyone suggest to me a phono preamp that will make my system sound like what I have spent to build it. TY mal11963