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.
KAB sells a subsonic filter that seems to be highly regarded. I agree with Artis4n; that's probably the only way to really solve the problem, if that's what you want to do. -Bob
I can not recommend the KAB unit highly enough. I would not have a vinly based system (the only way I really listen to music...) without one. It's sonically transparent and, in fact, will tighten the bass up a good bit since your amp is having to expend energy modulating your woofers like you're seeing.
Luna- If the degree of woofer movement varies with the record; look at the circumference of the discs, as you play them. If the excursions increase with the warp of the outer edge; you've found your problem. Barring the use of a subsonic filter; a damping ring would be the cure for that particular problem. ie: (http://www.soundfountain.com/amb/ttring.html) (http://www.ttweights.com/480_gram_alloy_outer_ring.html)
Its an isolation problem as other have mentioned - keep experimenting to find the location that causes the least disturbance. Understanding how the sound waves radiate from your speakers based on how you set them up will help alot here. Keep it away from the sound waves as best as possible.
What type of clamp or weight are you using. Before spending big dollars on rings get one of these. Used with the rubber washer under the lp it will flatten the record edge to ensure it touches the platter all around.
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