Michael, I think you were questioning JCarr's implication that a higher effective mass tonearm will produce more robust bass from your cartridge, even when the calculated resonant frequency is already within the generally accepted range of 8 to 12Hz (or lower than 8Hz, if you follow Kuzma's line of reasoning). Far be it from me to put words in JCarr's mouth, but I suspect the reasoning to back up his advice on increasing effective mass is related to the fact that the cartridge/tonearm/headshell are resonating at all frequencies in relation to the program material and that low bass frequencies induce the most energy and hence resonance into the upstream system. The equation we use is for the resonant peak, but there is resonance at higher frequencies, probably always inversely proportional in magnitude to the frequency. Hence bass frequencies produce more resonant energy than treble frequencies. Therefore, it may be that a higher effective mass than what is absolutely minimally necessary to place the peak below 12Hz helps the cartridge to control itself while trying to traverse grooves encoding low bass music. At least this makes perfect sense to me, and is in keeping with my own direct experience. Typically, the added effective mass will not be deleterious, i.e., will not drag the resonant peak down much below 8Hz so as to render the system sensitive to footfalls, or other environmental sources of disturbance.
Lyra and OMA
My first endeavor into moving coil. I’m thinking of a Lyra Kleos MC Cart and OMA SUT. Anyone want to speak to that. Please?
Bent
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Thank you all. I've learned a lot! HA, shame on me? I took too long to move on the Lyra and someone else bought it! It was an 'open box'- I can't do a $3,600 cart. right now. Plus... I was very much on the fence with adding mass to the arm as the solution to the lack of symbiosis described by @jcarr. A few years ago I had only the F9e, and was buying a new stylus, Peter Green at SS, said I might try to add a blue-tac weight (measured 1@gm) to the arm. It didn't work for me. The Korf discussion is fantastic: It clearly shows the Why, which was part of my quest after @jcarr wrote to the subject. Thanks: +10 @jcarr +1 @lewm +1 @tomic601 +1 @rauliruegas and everybody who helped me save $1,900 on a cart that's not right for my TT! Bent |
Let’s not leave out @solypsa . The century plus of experience was reflected in @jcarr statement to seek out an MC that sounds good on your arm. Effective mass and engineering resonance transmission and control are interrelated, within a small range the added bits can work, but not always…. I run both an additional weight / spacer w a Lyra on my Triplaner, and a Kuzma…. Enjoy the music all ! Jim |
as in + @solypsa |
- 47 posts total