How is the turntable mounted? Is the turntable close to the wall that the speakers are in front of?
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If you're positive you set up the arm correctly, and that the table is not on a ringing supporting shelf/table, etc. then I would use a bit of damping at the pivot. Just add 1 drop after listening...if the sound is good, add another drop and listen. Continue until there is a deadening of the sound...then use a Qtip, and remove that last drop. Now listen for the ringing. If its still there post again and we'll go further.
Did you check to make sure that the compliance rating of the Benz-Micro Ebony H is compatible with the effective mass of the JMW-Signature arm? If not, the rig will not track properly.
I've been there and one it with a number of other cartridges that I couldn't seem to get right with my VPI Classic 3 tonearm. An old VPI hand, Mike, was able to replicate a bass ringing problem that I had because of this type of mismatch. In the end, I had to settle on a different cartridge.
You might be able use the tools on the Vinyl Engine website to check compliance compatibility.
If your cartridge compliance matches with the tonearm's effective mass, I would consider the possible of a defective cartridge.
Stan and OP:
VE reports that the JMW Memorial 9 Signature arm mass is 9.5 grams. I assume that is the arm's effective mass. VE also reports that the Benz Micro Ebony H has a rated compliance of 14 and has a mass of 9.6 grams. And finally, I ran the VE resonance calculator. The Benz and JMW 9 Sig should be fine.
Stan's suggestion is the easiest to try and I hope it works. If not, the only other factor that comes to mind is that the TT is not set up on an sonically inert table or shelf. If none of these factors are the cause, I am back to the possibility of a defective cartridge .... and I hope I am wrong.
@OP ... Is Benz still around? How about the dealer?? My point is do you have recourse??
@OP ... btw, I assume that you eliminated other possible causes, e.g., electronic problem with your equipment.