Woofer sucking in and out

Hi Luna,

As Ralph (Atmasphere) said, you should make sure that the arm/cartridge relationship is correct. If there is a mis-match between the resonant frequency of the arm and cartridge it will cause very low frquency problems which will translate into pumping woofers.

If your analog set up is new you may want to contact the dealer that put it together for you for assistance. Brooks Berdan is widely considered to be an analog expert.

Best,

Barry

It is probably not a vibration control / isolation issue.

Barry

Hi Ct0517,

Thank you for your reply.

I did see that but I still feel the arm/cartride relationship needs to be examined again. Moving the TT probably only reduced the problem exhibited by that relationship.

The low freuency pumping of the woofers is probably not sourced from the speakers because it is much lower than their cutoff frequency. If it is sourced from some other source (like a large ac/heating system or a nearby industrial plant or highway) it can be verified by removing the belt from the platter and lowering the needle into the groove of a stationary record. If those are the source the pumping will be evident. The owner can also start the TT motor to see if that is the source coming up through the platter. If none of those are the source it is most likely an arm/cartridge mismatch or misalingnment.

Best,

Barry

Saw a number of typos in my reply but can't seem to find the edit control.