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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
moonglum
619 posts
 

Czarivey said :-

"It's not acoustic feedback to worry about it's EM resonance between cartridge and speakers"


This is nothing more than scaremongering. You'll find most audiophiles, including myself, will have learned to place sensitive gear e.g. CRTs and magnetic cartridges, at least 2ft from unshielded loudspeaker magnets.

MLs are magnetically shielded.

If you have both min clearance and shielding, case closed.

czarivey
5,946 posts
 

@moonglum , Didn't I mentioned Electro-magnetic resonanse?

Do you have any idea how heavy the ELECTRIC field of panel speakers? They can cause not only rumble but even ED when you hang around too close!

moonglum
619 posts
 

Those panels generate an electrostatic field not a magnetic one. To generate powerful magnetic fields requires high current (magnetic flux is proportional to current).

The aforementioned field is also constrained within the stators.

Magneplanars would be a different story... ;)

Anything else?

czarivey
5,946 posts
 
So are these electrostatic panels shielded or not?
How does 4kv static charge sounds to ya and how it's compared to the delicate LOMC output? 

krelldog OP
323 posts
 
I ordered the KAB Rumble filter.....I'll let you know what the results are. I can't move my turntable due to my setup. I did move the M/L Montis's out into the room more.....The amazing thing is: It doesn't happen all the time. The sound in my new setup is spectacular. I just want to cure the rumble issue.
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