2. analog
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Woofer sucking in and out

I have a problem with my analogue set up that once it starts play, the woofers of my speaker will move in and out like crazy, unrelated to the music! It relates with volume as when the volume is low, the woofers will not move as much. May it has to do with oscillation between cartridge and arm but my set up is new. The turntable is Acoustic Solid-Transparent and rega301 arm with cardas wiring and weight mods, Herron VTSP 3A pre and VTPH phono. I wonder if placement has anything to do with it or power connection.
I hope someone who has the same problem before can give me some hints.
Thanks.
luna
ahendler
416 posts
 
You are getting rumble in your turntable setup. It could be an isolation problem or poor setup. It also could be microphonics in the phono stage. Try tube dampers on your phono stage
albertporter's avatar
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albertporter
4,949 posts
 
From your description I'm guessing turntable isolation is the problem.

Is the turntable near the speakers? Is it in a room with a suspended (pier and beam) floor?

Lots of ways to help this situation, the best are all mechanical in that you resolve the problem by removing the interaction. Those options include a wall bracket, isolation stand, isolation feet or maybe even several of these together.

The fast and easy way is a rumble filter but it cuts low bass and puts another layer between the music and your ears.
luna OP
235 posts
 
It made sense as I have only moved the set up to the location next to one speaker on the side wall lately. It was between the speakers before. I thought equipment on the side is better than in the middle. I will try to move them back. I was thinking the tubes has gone bad or something? Thanks for the help and I will get back when I have some progress.
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albertporter
4,949 posts
 
Your idea is good, just happened that it brought about another problem. I've had things like that happen ever since I set up my first system.

If you don't make some mistakes you're not trying :^).
rockvirgo
587 posts
 
My turntable, a Dual 1219, was into woofer pumping too. Search A-gon's database for that and you may find more discussion. You're far from alone.
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