Help with Turntable/arm/cart decision

After using the Cartridge Resonance Evaluator I determined that I am at 10hz. My tone arm is 8.5g and the cartridge compliance is 15 that puts me in the 10hz zone which shows more than acceptable. So all I know is that my system has a heartbeat, 4 beats exactly, and it seems to get faster if I play the big 45rpm records. I can sit real close and hear and see my main speakers and the REL 4 very quick pumps then it goes away then 4 very quick pumps and so on....It happens on everything I play. I put digital on and everything seems to be rock solid there.

I was able to replace the 10" woofer by calling Dave @ Rel in Berkley CA. I received the replacement driver very quickly. So, Now I am waiting on a new phono pre amp (Manley labs Chinook). I have had bad luck with my last 2 phono stages. I really am looking forward to getting my system back up and running properly again. It has been a real downward spiral ever since I received the new Turn Table. One thing after another... electrical noise, woofer pumping, buzzing, blanketed sound, I am experiencing a little of everything right now. More later.

Matt,

As I posted on your Woofer Pumping thread ten days ago, it's obvious from the symptoms that tonearm/cartridge compliance is not the cause. Your test confirmed this.

Have you performed the diagnostics I suggested on 7/21?

This problem is unlikely to fix itself. The most likely cause is a defective turntable drive system component - either belt, bearing or motor. The sooner you file a plausible report with the dealer/manufacturer, the more likely you'll get a satisfactory remedy under the warranty. The longer you wait, the easier it is for them to claim owner error or abuse and disclaim liability.

Matt, I just read this thread from top to bottom. I also saw the "woofer pumping" thread, but did not read it in its entirety. However, I have to ask an obvious question: where is your tt located with respect to your speakers? (I am sure this question was asked and answered on the other thread, because Doug would have also been asking about it here if that were not the case.) Anyway, on the off chance that you have not considered this, acoustic feedback from the speaker to the tt can certainly cause this sort of misbehavior. And even if the two components are not in obvious proximity, you might consider re-positioning either the tt or the speakers empirically, because quirky room acoustics can result in feedback even when there is no obvious reason for it. Further I would advise you to figure out your basic problem before installing your new REL woofer, lest you blow another one. You mention that the driver pumping has some sort of periodicity to it. I assume that by now it is established that the pumping only is observed when you're playing LPs, not with other music sources. Have you listened carefully to your new tt, to determine whether it is making a periodic mechanical noise of some sort? (This is what Doug was getting at.) One worthwhile experiment would be to install a different tt/tonearm and observe whether you still have the issue. That would indicate a problem with our new tt. Perhaps you still have your old Thorens or you can borrow a tt from a friend.

You already verified that the table is the problem. What makes you think a new phono preamp will fix it?