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Woofers getting workout, but no bass

I'm puzzled: I'm noticing just about every LP I've played in the past couple days has my 10" woofers moving like mad, but not in time with the music and regardless of whether there's any audible bass.

I can only conclude that I have subsonic frequencies occuring (my phono stage doesn't have a filter). What would cause this?

Relevant components:
Speakers: Wilson Sophia 2's
Turtable: TW Acustic Raven One
Phono stage: Tron Seven

Thanks in advance.
madfloyd
mapman's avatar
mapman
22,520 posts
 
"Are you saying a ceedee playing down to,say, 25Hz will also cause excessive excursion?"

No, its a vinyl playback artifact not present in CDs.

"I think that ported speakers may be more susceptible, but that doesn't tell the hole story, IMO."

I would agree.
madfloyd OP
411 posts
 
Man, sometimes vinyl is a real PITA.
shadorne's avatar
Ag insider logo xs@2x
shadorne
7,477 posts
 
Do you know what is the port tuning? My guess it is between 25 and 35 Hz - otherwise you would not have such a problem even with vinyl, which I agree does tend to have some spurious LF due to the mechanical rotation of the disc once every two seconds...
dan_ed
2,451 posts
 
Pain? Perhaps at times. However, how does it sound to you? Warts and all, it still sounds better to me than any other format.
srwooten's avatar
srwooten
694 posts
 
Madfloyd-
Did you ever get your rumble fixed?
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