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Strange subsonic rumble problem?

Hmm.... I have 2 arms on my TW Acoustic Raven AC, a Reed 3Q and FR 66S sitting on Minus K platform. Yesterday, I took out my Koetsu cartridge and put on Ikeda Kai on my FR 66s. After the usual setup routine, I noticed significant subsonic rumble with the woofers pumping like mad when using the FR 66s. No such problem when using Reed arm playing the same record. I never had subsonic rumble problem in my system for a long time now and no problem with FR 66s in the past. The setup seems to be fine, all the joint, screws, etc are tightened properly as far as I could tell. Overhang, VTF, VTA, etc has all been checked several times so I am out of idea now what else to check to eliminate the problem. I assume airborne vibration, acoustic feedback should not be an issue since the problem was not there before and the turntable sits in the same location for years now.
Thanks for any suggestion.
suteetat

Showing 2 responses by pcosta

pcosta
240 posts
 
Could it be the combo of the Audio Tekne transformer and the Aesthetix Io? Have you tried the Io alone with another cart.
Most users with Io owners use it without a transformer from what I have read. I understand why you are using it that way since the Ikeda output is so low.
pcosta
240 posts
 
Suteetat

Well you have ruled out the Tekne SUT with the Aesthetix since it works with your other arm.

Perhaps the ground lead has come undone inside the arm. Check continuity with a meter.
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