Speaker flapping from V15 on SL1210

[Cairns4me]

Hi guys..Am having kittens over this issue. Sl1210 w/std arm and turntable absolutely level, tried my V15-IV, my V15-III and my M91ed ALL have SAS stylii. Have fitted a Kab Fluid Damping trough & tried it with 1/3, 1/2 & 3/4 filled. Tried all carts , using st'd Technics branded headshells, at VTF 1.0 to 1.5g. I always get woofer pumping. Using the HFN test record I get lateral resonance at 7Hz.
No discernable vertical resonance. Tracking is superb otherwise on all of the tracks-even the last track on side 2-the torture track !!
I tried the V15-IV with the brush down & up and still get the same woofer flap/pumping.
I'm a pipe organ fan so I too like my low bass..... Any suggestions for turntable work or do I look to carts with lower compliance? All advice appreciated. Cheers.

[Macca]

How well do you have the deck isolated and how far from the loudspeakers? - could be airborne or structure borne vibration feeding back into the TT?

[YNWaN]

What speakers are you using and are they ported by any chance

[Cairns4me]

Thanks guys. I have identified the problem is NOT turntable siting or acoustic feedback from speakers but DEFINITELY arm/cartridge resonance issue. The resonance is happening at 6Hz with highly visible LATERAL vibrating type movement. So would it be reasonable to expect the (kab) silicone damping trough to be able to lessen or eliminate this resonance by altering the level of fluid from its existing one-third fill or am I better off to change to a less-compliant cartridge, remembering it's a Shure V15-III sas ( high compliance ) in a Technics SL1210 arm.
Please share your thoughts.

[YNWaN]

Yes, I would expect you to be able to largely damp the oscillation if sufficiently damped. I don't know anything about the kab damping trough you mention, but you may have to use a heavier weight of silicone.

However, this is really just disguising the issue and the real answer is to buy a less compliant cartridge.
______________

P.S. I can't seem to find your introduction post (so I can't answer my own question regarding your speakers)?

[Marco]

Hi Laurie,


Thanks guys. I have identified the problem is NOT turntable siting or acoustic feedback from speakers but DEFINITELY arm/cartridge resonance issue. The resonance is happening at 6Hz with highly visible LATERAL vibrating type movement. So would it be reasonable to expect the (kab) silicone damping trough to be able to lessen or eliminate this resonance by altering the level of fluid from its existing one-third fill or am I better off to change to a less-compliant cartridge, remembering it's a Shure V15-III sas ( high compliance ) in a Technics SL1210 arm.
Please share your thoughts.

Welcome to AoS :)

Before you go any further, please pop into the Welcome area (as you were asked to do in your registration email) and introduce yourself to our community, telling us what system you use and what music you like, as this procedure is required of all members.

Cheers! :cool:

Marco.

[jostber]

You could also try the HAL-O JR tonearm damper from Herbie's.