What I've noticed in mass tuning a rega tonearm for the DL103-R is that in order to gain a full point hz reduction (1 hz) in arm/cart res I had to increase mass at the headshell by 7.5g. Which is approximately 68% of the arms original effective mass rating.
I expect that this could be roughly applied to any tonearm. If you want to lower the arm/cart resonant frequency by 1 full hz it takes the tonearm's rated effective mass plus the addition of 68% of that rated mass in additional weight over the headshell. Sound about right?
Incidentally I ended up adding an another 25g of weight to the counterweight (an Expressimo) in order to balance the the arm.
Results were easy to hear. The DL-103R sounded more liquid with warmer mids, better defined details/inner-details and frequency extension. It was an obvious improvement and told me what I needed to know about the DL-103R. It needs more than a medium mass tonearm to work its best.
link to article: http://www.theanalogdept.com/dl_rb.htm
-Steve
I expect that this could be roughly applied to any tonearm. If you want to lower the arm/cart resonant frequency by 1 full hz it takes the tonearm's rated effective mass plus the addition of 68% of that rated mass in additional weight over the headshell. Sound about right?
Incidentally I ended up adding an another 25g of weight to the counterweight (an Expressimo) in order to balance the the arm.
Results were easy to hear. The DL-103R sounded more liquid with warmer mids, better defined details/inner-details and frequency extension. It was an obvious improvement and told me what I needed to know about the DL-103R. It needs more than a medium mass tonearm to work its best.
link to article: http://www.theanalogdept.com/dl_rb.htm
-Steve