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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 1 response by perazzi28

perazzi28's avatar
perazzi28
224 posts
 
I would advise against the use of filters.  Yes cartridge loading can be a real issue and 20 ohm loading should be increased to 100 ohms and see (or rather hear) any difference.
Secondly, most good preamps will pass DC which will of course create havoc with your woofers.  Some woofer motion with normal vinyl playback will be present on a fair amount of material. 
So as presented earlier, TT isolation is paramount + proper cartridge loading.
Best of luck,
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