phono preamps with a subsonic filter?

If the subsonics are on the record and not a result of the arm/cartridge (mis)matching I'm not sure how much help the filter might be. I have a TC with a sub sonic filter and a couple of LP's which cause substantial woofer excursions. I put the filter in line but it made no difference, on or off. If its just a couple of LP's, don't play them. :-) If it happens on a lot of LP's, look at set up/matching issues. A subsonic filter is, IMHO, a cheap bandaid used to cover up a major problem.

Dopogue, Apparently my response was ambiguous.

FWIW, my reference to a "bandaid" was to using a subsonic filter to mask a problem in the cartridge/arm matchup. The effect of mis-match will creep up into the audible frequencies if you don't correct the problem - by using a subsonic filter you just stop the woofers obvious flapping.

As to using a subsonic filter to solve software encoded information problems, do what works for you. I was just pointing out that mine did not work for me with the problem the original poster was referring to.

But here's a thought - if you can actually hear it in playback its probably not really subsonic, so a filter meant to really apply to the subsonic frequencies might not extend high enuf to affect audible frequencies. Perhaps my filter was truly a subsonic filter which rolled off before it got to the 20hz zone. Don't have the stats on the filter so I really don't know. Just a thought mind you......