Tonearm ringing excited during playback

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.

I have a hotrod Scout with the 20lb platter and 10.5" Classic arm.  Same problem, ringing when tapped and on silent grooves or passages.  My solution was to put small plastic washers between the headshell and my Lyra cartridge AND on top of the headshell between the top surface and screw head.  A great improvement.  Washers are on Amazon for cheap.

https://www.amazon.com/gp/product/B01N02UG1F/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

I had a Benz Ebony LPS on a VPI metal arm and it was wonderful......I really don't think the problem is the arm