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Subwoofer rumble issue

I’m having a hard time solving a problem that seems to come and go. My subwoofer will rumble uncontrollably when playing records at a higher volume. If I turn the volume down sharply it goes away but when I creep the volume back up it comes back. I’ve tried isolating my turntable as much as possible with diy books, isolation feet, etc. (I don’t want to buy an expensive isolation platform unless that really is the issue.) Any thoughts on what I can do to fix this? Thx!
paulgardner

Showing 2 responses by audioman58

audioman58's avatar
audioman58
4,286 posts
 
What kind of sub ,or how cheap is it made.
Buy the svs sb 3000 with control app for under $1k delivered 
And free shipping and 60 day audition  nothing better even at $1500 plenty of awards !!
audioman58's avatar
audioman58
4,286 posts
 
It is  s Must ,saying what brand,and model it is cheaper ones 
Has minimal control small amplifiers, magnets and pole pieces
As well as cabinet construction all important factors 
How to you adjust it ?  The SVS 3000 line SB with app
For just UNDER$1K 13 inch aluminium driver  beat my  $1500 JL Audio in every respect
The split coil poll piece  works for great bass even at low volume
And the app works great . #1 sub and buy of the year. 
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