Adding mass to a tonearm


I would like someone to explain to me why adding headshell weights doesn't really alter the mass of the tonearm that much when figuring cart vs tonearm compliance. I have a Denon DL-103r and I keep reading that's it's for high mass tonearms. I also hear that adding headshell weights doesn't really alter the mass. What gives?

I want to try a DIY on my Pioneer PL-530 turntable tonearm where I mask off the arm such that only the chrome arm on the headshell side is visible and spray it with Plastidip. This would seem to add mass and resonance control. If it doesn't work the I can just peel it off.  
last_lemming

Showing 1 response by sbank

Even if you proceed with your experiment, you might just find that you don't have enough counterweight on the back of the arm. Headshell weights are usually for use with extremely light cartridges, but that isn't the case with 103R. 

I'd suggest trying the resonance test tracks on the HIFi News test record before and after any experiment. 

Also, a potential can of worms, but if you are planning this whole concept because of vinylengine calculator results "are you factoring in  the tendency for Asian, espec. Japanese, carts to establish their µm/mN compliance figure at 100Hz rather than the 10Hz typically used by the various on-line calcuators and formulas. Unfortunately many Asian manufacturers rarely publish that info. Euro carts generally use 10Hz.

I also understand, but am not an expert here, that there is no direct translation or conversion formula. The general rule I've read is to multiple the 100Hz compliance number by somewhere between 1.5 and 2.0, then use that result as part of the resonance frequency assessment. I use 1.75. Vinyl Engine gives the green light to resonance frequencies in the 8Hz to 11Hz range.". Cheers,
Spencer