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Turntable feedback

I was listening to a record on my Rega planar 3 which sits on a 1 inch thick slab of granite which sits on 4 metal vibration isolation points which sits on a tabletop made of a slab of solid hickory that is 1 1/4” thick. Yet through all that I had bass feedback. The feedback went away when I turned the volume down a bit. It was not that loud. I’m thinking the bass energy went right to the turntable and not up from below. Any thoughts on getting to the root of the problem? Subwoofer is a Goldenear which is powerful but I don’t like bass to be unnatural sounding so it is not booming at all.  I like it for its detail not punch. 

The turntable is in a corner nook so I wonder if there is a standing wave in the nook that could be transferring directly to the platter. Has anyone else had this problem?

Thanks
schmitty1
cleeds
6,271 posts
 
millercarbon
Granite is great for mass and dynamics ... But granite also rings.
I’ve seen others make this claim and it confounds me every time. I have two granite shelves in my system, and each of them is deader than dead. The only thing that happens if I rap it with my knuckle is that it hurts my knuckle. And if I tap it with a hammer, it’s still deader than dead.

So I have to ask: On what do you base the observation that granite "rings?"
geoffkait's avatar
geoffkait
23,365 posts
 
Eggs ackley! Granite rings is an old wives tale. Ditto bluestone, they especially won’t ring when they’re 2 or 3 inches thick. Hel-loo! Even better - use granite or bluestone as slabs on springs. Then the slabs are isolated. Problem solved! 🤗
noromance's avatar
noromance
10,187 posts
 
Try it without the granite.
geoffkait's avatar
geoffkait
23,365 posts
 
Don’t hit it with a hammer while music is playing. - old audiophile axiom
three_easy_payments's avatar
three_easy_payments
2,097 posts
 
You mean my system would sound better if I'm not constantly whacking the rack with a hammer?  This may be the least expensive tweak ever.
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