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In Reply to: RE: Woofer Pumping posted by AudioSoul on February 06, 2016 at 09:42:31
Most importantly, is this happening only with vinyl or with digital program sources as well? BTW, turntable rumble can do it (would have to be pretty severe, IMO), but record warps are the most frequent culprit or acoustic feedback, in my experience.
Follow Ups:
I did forget to say didn't I. The only time this happens is from playing records. If this is happening from warps in my Lps then they would all have to be warped, which they are not. I have seen the effects before and it effects both speakers. This is why I find it unusual since just the left side is effected. I am not playing the music loud enough for it to be acoustic feedback. Thank you for your response. Any other ideas would be appreciated....
One possibility worth eliminating is whether your non-pumping woofer is operating normally. In other words, the fault could lie in the speaker opposite the one that is affected. Two things to try:
(1) Play a mono LP and put your ear up to the two woofers, in turn. Is there any difference in intensity? (Better yet, if you have one of the ubiquitous Radio Shack Sound Pressure meters, use that.)
(2) Switch speaker wires between the two speakers (or between the two woofers, if they are separately wired). Does the "pumping" now occur in the opposite woofer?
Edits: 02/06/16
What tonearm and cartridge are you using?
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