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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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In Reply to: Rega counter weights (again?!) posted by Aleksunder on September 11, 2006 at 06:07:53:
Lot's of interesting stuff, and it's all helped clarify a few things.I've been trying to explain what I think are the effects of mass-distribution of C/Ws, specfically in context of the roll/rotational mode of a Rega arm-tube.
There are two distinct aspects to consider.
- changing effective mass of the C/W. For example, if similar mass concentric weights are made with a deep, small diameter and a shallow, large diameter the latter will have more effective mass and better damp the effect of a force trying to roll/rotate/twist the arm-tube.
- changing the centre of mass; if the the weight is 'dropped' or 'under-slung' moving it's center of mass downwards (comparing two of exactly the same dimensions and weight), the C/W now itself exerts rotational torque (via it's weight, i.e .the force of gravity) which also resists any force trying to roll/rotate/twist the arm.
What I'm 'hypothesising' is (trying really hard not to sound pretentious here) that this helps ameliorate the flawed vertical bearing arrangment of the Rega in subtle but important ways.
I reckon because the bearings are so close together, and hence to the axis of the roll moment, they are loaded in a less-than stable (or completely symmetrical) way, that this affects how they both support the static weight of the of the arm assembly and more importantly (because of this?) in the way they transmit audio-band energy to 'acoustic ground' via the yoke > arm-pillar, and so on. IOW, it improves whole shebang sonically.
I would hazard a guess that people using underslung C/W's mainly (but not exclusively) perceive better 'imaging' from stereo recordings than with mass-centered and/or low effective mass ones.
The only fly in the ointment is that these factors (mass distribution) are also effective in the 'pitch' (up and down, warp-tracing) moment of the arm, producing the much discussed additional dynamic variation in VTF (the arm actually moves in this mode, remember) - as if warp tracing wasn't enough of a problem already.
As I've already pointed out, this isn't the same geometry as, for e.g., the SME IV & V series, which have the vertical pivot below the arm-tube, in the same plane (more-or-less) as the record surface and the centre of mass of the underslung C/W, so the C/W thus still exerts it's stabilizing rotational torque but most of the VTF issue is avoided.
Anyway, my hunch is that the trade-off is worth it, though - within reason.
In my case, particularly so, given I'll be using a Townshend TT - LP's will always be clamped flat and the arm will be well-damped, to say the least.
ciao.
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Follow Ups
- Re: Rega counter weights (again?!) - recapitulation - Aleksunder 06:55:01 09/12/06 (0)
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