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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 2 responses by mofimadness

mofimadness's avatar
mofimadness
4,933 posts
 
Sounds to me like you might be getting acoustic feedback/acoustic breakthrough/intermodulation distortion/rumble through the speakers.

This happens if the system is turned up too loud and the speakers are causing the arm/cart to excite. A rumble filter would solve this.

I’m assuming you checked all the alignment parameters of the turntable/arm/cart?
mofimadness's avatar
mofimadness
4,933 posts
 
@krelldog...these were/are known also as subsonic filters.  I'm sure you've owned at least one preamp or phono stage that had one.  They used to be pretty prominent on preamps, but not so much now.
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