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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
yogiboy's avatar
yogiboy
6,187 posts
 
+1 georgehifi
A subsonic filter will not solve the problem! The table is what you should address!
https://www.vinylengine.com/turntable_forum/viewtopic.php?t=47974
geoffkait's avatar
geoffkait
23,365 posts
 
And what’s causing the problem with the table? The subwoofer. The REL is driving the room. It’s the structureborne vibration, seismic plus Rel. The resonant frequencies Fr of the cartridge and tonearm are circa 8-12 Hz, the platter can be even higher. Some rooms are incredibly microphonic, especially the upper floors of buildings. Some racks/stands amplify the vibration. The REL weighs only 42 lb so my cryo’d Baby Prometheans would be sufficient to properly isolate the REL. $48 free shipping, cannot beat with stick!
kalali's avatar
kalali
1,977 posts
 
Just out of curiosity, try inverting the phase on the subwoofer and see if it makes a difference. 
paulgardner OP
183 posts
 
@kalali yep tried that. Nearly took the whole building down. Yikes!
geoffkait's avatar
geoffkait
23,365 posts
 
Wouldn’t that mean the subwoofer is in correct phase. If it’s out of phase (polarity) the bass would be reduced, right?
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