I believe you would have similar results if you used ZYX TB/SB mass weights instead of shakti.From your photo the ZYX has no mass weights,so,its weight is 5gr and possibly arm/cartridge resonance is on the high side without them considerin the zyx's low compliance.The shakti acted as a mass weight imo.
I use a zyx/sb on my turntable and surely the sb weight was necessary to have a resonance at around 9-10 hz.
I don’t completely reject your explanation. Your explanation is an hypothesis. EMI reduction is an hypothesis, too. Both don’t have scientific evidences to support. Which one we should believe? I lean towards EMI reduction in the case of shakti.
In my opinion, arm/cartridge resonance theory can be very well applied to different cases. For example, the tightness of cartridge screws has an impact on noise level and sonic characteristics. I also made some carbon fiber washers for cartridge. Please see the photo. These washers also have impacts on arm and cartridge resonance. I can hear reduction of background noise.
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I don’t completely reject your explanation. Your explanation is an hypothesis. EMI reduction is an hypothesis, too.
One is based on science, the other is based on babble used to defraud the gullible.
In my opinion, arm/cartridge resonance theory can be very well applied to different cases. For example, the tightness of cartridge screws has an impact on noise level and sonic characteristics. I also made some carbon fiber washers for cartridge. Please see the photo. These washers also have impacts on arm and cartridge resonance. I can hear reduction of background noise.
Arm/cartridge resonance, I mean the resonant frequency caused by total effective mass of tonearm/cartridge/screws and cartridge compliance.Not any stractural resonances of tonearm or cartridge body etc... that can be reduced by different means.
Do a search for longhorn cartridge mod. There are other discussions besides this one, though I'm posting it for the link to the Audio Basics Longhorn article from 1982:
" Longhorn" Modification revisited
" Longhorn" Modification revisited
Here are some pictures of my longhorn mod :
http://www.diyaudio.com/forums/analogue-source/253888-my-longhorn-mod.html?highlight=longhorn
http://www.diyaudio.com/forums/analogue-source/253888-my-longhorn-mod.html?highlight=longhorn
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