2. analog
  3. 127090-486

The Palladian-A step beyond

The new cartridge from Acoustical Systems may finally be the LOMC to fully realise the theoretical advantages of the genus.
And convince those long-suffering audiophiles to whom the 'modern' MC presentation has been anathema to 'live sound'....that the realism of vintage LOMCs like the SPUs and FR-7 series has finally been recaptured 👀
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128x128halcro
fleib
1,124 posts
 

***Why would a MM cart have any difference in stylus movement than a MC?***

I don't think you can attribute any differences there to generator type, seems more like a function of stylus profile, contact area, groove height and that sort of thing. It might be nonproductive looking at it that way.

There's another traditional line of thought as to energy transfer and motor type and it has to do with the nature of the beast.  Because the coils are moving they transfer more energy and are more subject to returning energy. This kind of makes sense. The fixed coils in a MM are gigantic in comparison and you have a small magnet or two, wiggling.

One thing is for sure, MM's are much harder to load, but they're tunable. 

halcro's avatar
halcro OP
2,664 posts
 
Fleib and Richard,
If we agree that the movement is the same at the stylus for both high and low compliance cartridges......wouldn't the greater movement at the end of a high-compliance cantilever cause an equally larger reaction (Newton) which the tonearm sees?
Wouldn't that then put greater stress into the arm?
No-one can explain by physics.....why it is claimed that low-compliance cartridges put greater stress into tonearms....🤔

richardkrebs
422 posts
 
Halcro

Low compliance carts are stiffer, so it takes more effort to deflect  the suspension when playing a record.
More energy in that has to be controlled by the arm.
 

Cheers 

halcro's avatar
halcro OP
2,664 posts
 
Low compliance carts are stiffer, so it takes more effort to deflect the suspension when playing a record.

Hang on......
We've agreed that the deflection of the stylus at the groove is the same for high and low-compliance cartridges.
Which means that the end of the cantilever must move more with high-compliance and less with low-compliance.
Where does "effort" come into play in a physical sense?
I don't understand the term "effort" in a structural sense either?
Can you put it in an equation?
richardkrebs
422 posts
 
Halcro
It's late, a long day and I have an early flight to your country. I assume that it is hot?

Compliance  measured in um/mN
I think I have the units right? Please excuse me if I haven't.

Anyway.... 
So for a given force we have a measured deflection.
It takes more force (effort) to move a low compliance cartridge a given distance.

So when playing a record, a low compliance cart will need a higher force applied to the stylus to make it move. We want the cart body to stay still while this is happening so it must absorb this energy. Which in turn means the arm has to deal with this as well.

When playing a record, a high compliance doesn't necessarily mean more movement at the motor end of the stylus. The opposite is also not necessarily true. 
It depends upon the geometry of the suspension and where the mag or coils are.
This with all the usual caveats of compatible arm, etc

cheers 


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