In an early 80s Linn lp 12 manual is said that by rotating the springs by trials and error is possible to get the most low frequency swing and bass response from the Lp 12 . I don't think to have found the same statement in subsequent owner and english manual .
what said in the early manual is correct or not ?

Do you have a link to the setup manual you’re referring to?

No I don't .

I know tnat one side of the spring is hard and one is soft . But I don't think it could be possible to get a swing motion really low.
In other words I cannot think that by a perfect orientation of the spring you can obtain such a low frecquency bounce such as you can by a minus K isolation platform just to quote an example .
.

the spring topic is complex and in the end all the 3 springs need to work together rather than against each other. Yes turning the springs helps to cancel sideways movement. But that is art. I believe what you state is right.
There was even a test having your needle on the record without spinning the platter engaging the up and down movement (bounce) there should be no pumping to be seen in your loudspeakers bass drivers.
But be careful to not kill your cartridge.

Adjusting the springs removes sideways motion, as Defender just wrote. The closer to a single frequency piston like bounce, the better.

Adjusting the springs doesn’t change the fundamental bounce frequency, but it can remove the overtone oscillations of the subchassis.

Ths for your answers. Now everything is understandable .

ROBIZ wrote: ↑2023-03-18 19:52 I know tnat one side of the spring is hard and one is soft . But I don't think it could be possible to get a swing motion really low.
In other words I cannot think that by a perfect orientation of the spring you can obtain such a low frecquency bounce such as you can by a minus K isolation platform just to quote an example .
.

The Linn spring is simply a conical spring made to Linns specifications and it's not specifically designed or engineered to be hard on one side and soft on the other if that's what you meant, it's a spring made like many other springs in that where the lead of the coil wire starts and where it ends in the construction of the spring creates slight differences in vertical tensions throughout it's circumference -at certain points one side of the spring may have 11 coils and on the other side 12, also where the wider dia. end coils overlap for example- thus spinning the spring in conjunction with the other springs can cancel unwanted or wanted motions/frequencys in or out as Legonklou stated to meet the desired bounce.. Many years ago Linn actually made a change to the springs where they were once wound counterclockwise they are now wound clockwise, not sure why and Linn never told us but they weren't any easier or harder to set up that I recall.

Ths for your answer . You 're right . I recall the older springs and were different .

lejonklou wrote: ↑2023-03-18 21:25Adjusting the springs doesn’t change the fundamental bounce frequency, but it can remove the overtone oscillations of the subchassis.

That's interesting Fredrik. I find that when my springs are out of adjustment, the bounce frequency appears faster than when they are adjusted optimally. This could just be my eyes playing tricks on me, but it doesn't appear so.

Isn’t that because the springs are locked up, so that the fundamental frequency is blocked and only overtones remain?

Don't know, possibly?