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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
leotis
180 posts
 
Where is turntable placed?
When placed in corner I had rumble.
Mid wall no rumble.
Bass builds up in corners.
mains
170 posts
 
hi 
your answer is a pair of Townshend Audio Seismic Podiums please check out for sale on audiogon the seller can provide any size to order at discount prices. All you need is your speakers footprint and weight for the correct size and load cells you will be gobsmacked i will add some links to reviews over here in the UK they are definitely the answer unless your equipment is faulty.
mains
170 posts
 
Check out Townshend Audio Website for reviews, i use the big Sound lab Dynastats i could never get the bass right until i put them on the Seismic Podiums the results are jaw dropping , you can buy from audiogon for sale pages good luck you will not have any further bass problems and you will hear your speakers like never before.
stereo58's avatar
stereo58
3 posts
 
I agree with Mofimadness and a few others that you may be dealing with "acoustical  feedback".  I had the same issue in a console. My turntable was producing a lot of hum when using my turntable and turning the volume anywhere past 11:00. I ended up getting an amazing isolation platform from  Symposium called the ISO Segue! It solved the problem immediately- quiet as a mouse!
russmaleartist's avatar
russmaleartist
52 posts
 
Even though my turntable was on a wall bracketed shelf, I still got air-bourne feedback. The woofers, especially my subwoofers, would be oscillating, and I also saw my tonearm bouncing up and down -- not out of the groove, but it was pretty peculiar to watch.

I used a KAB rumble filter, added more methods of isolation under the turntable, even between the wall bracket and the wall itself. The only other thing that comes to mind is isolating your turntable in another room, but then you would have to get up everytime to tend to it.

Best to you in your rumble and feedback endeavors -- hope you can solve your problem.
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