Bass distortion-Playing LP's only,,,,please help


VPI Prime----Ortofon Black Quintet (low output moving coil cart)-----Plinius Koru Phono Pre( loading at 20 ohms/gain at 66 db)-----Parasound Halo Integrated -----Martin Logan Montis speakers which have powered bass cabinets.

Using any other source component I have absolutely no issues. When I play an LP and increase the volume past 10 O'clock which is a little loud....but not ridiculously loud-I at times get this huge wave of bass distortion. I do have bass controls on the Montis's...and I have turned them down into the negative, but I still get what I previously described occasionally. 

Any and all help would be appreciated. This doesn't always happen, but its frequent enough to drive me crazy.

Thanks in advance.

krelldog

Showing 1 response by martykl

Agree with most folks here - very likely acoustic feedback.  First choice of potential fix - move the tt further from the speakers.  If the speakers and tt both sit on the same suspended frame wood floor, this can be a bitch to eliminate.  If you can get them on two different flooring structures, you're way ahead in the game.  I know that's a big "if", but it's the best way to go whenever feasible.