Resfreq.com has the optimum range between 8-12Hz, but notes a 40+ year old white paper with a very different frequency range as follows: "It is interesting to note that Poul Ladegaard of 'Bruel og Kjaer' determined empirically that the 'best" resonance frequency would be much higher (15Hz to 18Hz) than what is normally considered desirable. See his excellent AES paper published here."

I'm asking because when you do the math on a 12g cartridge weight (e.g. Lyra Atlas Lambda SL) using the resfreq.com calculator (and including a 1.5X conversion rate for 100Hz/10Hz reported values--making the 12 reported by Lyra at 100Hz come out to 18 at 10Hz), you need to have a 10g effective mass tonearm to hit 8Hz.

According to Galen Carol's website a 10g effective mass tonearm is considered low mass--see below:

"A tonearm whose effective mass is rated at 10 grams or below is considered low mass (e.g. early SME’s, Grace 747 etc.). A tonearm whose effective mass is rated between 11 and 25 grams is considered moderate mass (e.g. SME 309, IV, IV-Vi, V, Triplanar, Graham). Arms above 25 grams of mass are high mass in nature (Eminent Technology, Dynavector)."

Yet, Lyra's website recommends the following for use with the Lyra Atlas Lambda SL cartridge (from Lyra website):

**"Recommended tonearm:**Medium to Medium-High mass arms recommended, which is bulk of tonearm market"

I'm interesting in others' actual experience on this subject. Are the calculators a reliable beginning point? A reliable ending point? One of many points to be considered?