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Woofer pumping - what gives?

Some years ago I noticed that regardless of the speakers, cartridge or preamp in the circuit my woofers pump wildly out of control the more I advance the volume while playing an LP. They don't seem to be responding to the musical signal but something else. The sound is fine. My humble rig is a Dual 1219 with a NOS Shure M91ED cartridge. Tapes made from the same LP's do not exhibit this odd behavior. Who knows why woofers look like they're going nuts while playing an LP?
rockvirgo

Showing 1 response by bwhite

bwhite
807 posts
 
Man is this contagious? I think I have it too!! I just set up a table (not too well mind you).

I was using a JA Michell phono stage and it wasn't marked left/right so I guessed which in/outs to connect to. It was making horrid sound as the volume increased and then went away briefly when I turned down the volume. When I raised the volume, it happened again... over and over and over. Annoying.

Just now, I switched the connectors around on the phono stage and the wubba-wubba stopped... But I have a small hum from the phono now.

Geez... is this ever easy?
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