2. analog
  3. 1379095521

Low frequency problem while playing vinyl

Has anyone experienced (and knows a cure for) a very low frequency problem while playing records. Just recently I hooked up two old turn tables, Linn LP12 (1980s) and Dual 704 (1980) in my system and the woofers of my speakers are almost jumping out of the speaker cabinets while I am listening to a record. Displacement at least 0.5 inch if not more and the keep "pumping". Needless to say that I didn't experience this issue years ago when I used to play records regularly.

amps: Krell Ev202/350MCx
speakers: Thiel CS7 + smart sub
phono amp: Valvet
whiskeyhill
zd542
5,339 posts
 
Were you using the same phono cart with both TT's?
stereo5's avatar
stereo5
2,766 posts
 
It isn't acoustic feedback as I had the same problem. After trying everyone's advise here, I bought a KAB rumble filter and it solved the problem. It goes on a tape loop and it does not take away any bass, just the oscillating.
yogiboy's avatar
yogiboy
2,678 posts
 
It could be arm and cartridge mismatch. Resonating above 12hz.
bpoletti
1,004 posts
 
Dirty bearings? Warped records? London recording of Tales of Czar Saltan?
viridian's avatar
viridian
4,184 posts
 
Here's a test, with the turntable off, not rotating, place the cartridge on a record. Slowly advance the volume to the level that you commonly listen at. If howling begins, back off. You have found out that you have a problem with acoustic feedback and if it is structure borne, you will have to change the structure on which the table sits. If it is air borne, you will have to site the turntable somewhere else.

This is usually only a problem with vented woofers, which are unloaded below their primary resonance. Acoustic suspension woofers remain loaded and will not show this kind of response problem.
More to discover