Peter, the effective mass of a tonearm, is that something all manufacturers mentioned in their specs?
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Extra:
• https://vertereacoustics.com/tonearms/vertere-reference-tonearm-2/
• http://vinyl-club.blogspot.ca/p/analog-tonearm-pivot.html
The effective mass of the vocal
"Arm The "effective mass" of an Effective Mass vocal arm does not refer to the weight of the entire arm, but to the mass of the moving part.
It must be measured before it can be obtained. We are not counting our own calculations.
...
Example: The effective mass of the
Morch DP-6 The Morch DP-6 offers four different quality arm tubes, namely... 4 g (green), 6 g (red), 8 g (yellow), 14 g (blue) in the
end to choose one?! depending on the weight of your cartridge, depending on the extent.
...
Why do we need to know the weight, the order, and the effective mass of the phono?
Because the pickup (needle) is itself a resonant body, the singing arm is also, and after the combination of the two things, it will generate a "new" resonance frequency.
In order to avoid resonance noises, even if the pickup head is "resonated" in resonance,
we must control the resonance frequency beyond the ear-sensitive range (< 12 Hz),
and we must avoid the extremely low-frequency resonance noise (> = 8 Hz).
Therefore, the effective mass of the arm must match the weight of the pickup
so that the resonance frequency falls within the ideal range: 8 - 11 Hz.
(Some data suggest 5 - 15 Hz, or other, but the wider the range, the greater the risk of resonance.)
The resonance frequency of the phono + pickup (in Hz)
= ? (1 / ((MC + EA)* C)) / (2 * ?)
= ? (1 / (((MC + EA)*C)) / 6.2832
= ? (1 / (((MC + EA)*C) / 39.4786)
= ? (0.0253 / (( MC + EA)* C))
= 0.159 / ? ((MC + EA)* C) (PS This C is cm/dyne)
= 159 / ? ((MC + EA)* C) (PS This C unit is 10^-6 cm/dyne)
where...
? : 3.1416
MC : Weight of the pickup, which must include screws and washers.. (Unit g)
EA : Effective mass of the horn (unit g)
C : Player at 10 Hz Dynamic compliance (in units of 10^-6 cm/dyne, or um/mN, or cu)
...
To control the resonance frequency between 08 - 11 Hz ...
then 08 < 159 / ? ((MC + EA) * C) < 11
ie 208.9326 <(MC + EA) * C < 395.0156
When C = 05 Then 41.787 <(MC + EA) < 79.003
when C = 10 then 20.893 <(MC + EA) < 39.502
when C = 15 then 13.929 <(MC + EA) < 26.334
when C = 20 then 10.447 <(MC + EA) < 19.751
... In
accordance with this formula, we know that ...
low degree of compliance (< 10 cu) pickup ... is suitable for "heavy" quality tone arms.
Medium compliance (10 - 20 cu) pickup......... suits the "Middle" quality tone arm.
High obedience (> 20 cu) pickup.................. fits with a "light" mass horn.
As for the quality of the detailed arm, it depends on the weight of the cartridge you choose.
...
However, this is just a theory. In fact, the situation in which resonance occurs is complex and still depends on the material and design of the turntable, the horn, and the pickup.
So, you'll find out... Some sings arms don't provide valid quality data at all,
and some sings arm offers collocation advice, "maybe." The results calculated from the formula are not the same.
Therefore, how to choose the phono + phono arm, in
addition to theory, it is best to "reference" the experience of previous generations.
...
PS has a cymbal damper designed horn, which can control resonance by the amount and type of oleophobic, and has a large elasticity."
...
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Prices (MSRP - tonearm and tonearm cable) ... only high heels need to apply ($63,000 Cdn):
• http://www.element-acoustics.ca/products.php?cid=1&sid=4&tid=0&pid=2326
Down to planet analog Earth:
• http://www.the-ear.net/news/affordable-vertere-tonearm
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