How to fix woofer pumping


Hello,
Looking for a little assistance/advice. I recently noticed some pretty severe "woofer pumping" while playing at a fairly high level. I don't think it's feedback, as it will not "run away" and get worse, just seems to suck the power out of the base. My system is in a fairly open room, system pics are accurate placement, but the gear has changed a bit. Last changes were getting rid of a ML 32 pre and replacing it with a VTL 7.5 plus the Ayre P-5xe phono pre. The ML had a rumble filter, which I used, the Ayre does not. System:
Clearaudio Champion 2
Clearaudio Titanium
Wall mounted with granite
Any help is appreciated.
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Showing 1 response by marakanetz