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RE: theoretically the aluminium is better, but not for sound? ...

Why do you say an aluminium subchassis doesn't deliver good sound? If that is the case ... then why would Linn choose aluminium for their Keel subchassis?

As others have said, due to the spring construction, a subchassis should be lighter ... rather than heavier. However, the subchassis material itself, has an affect on the sound.

I think magnesium & titanium are lighter than aluminium - but I suggest:
* these materials are more difficult to machine, and
* they are certainly more expensive

. . . than aluminium. Hence, Linn chose aluminium (however, we don't know whether they ever listened to a magnesium Keel! ;-)) ).

A CF-end grain balsa-CF composite makes a good subchassis - as does the CF-aluminium honeycomb-CF construction started by Cetech in about 2000. The top CF skin is used to mount the bearing housing & spring bolts ... the intermediary material and bottom CF skin act as a dampener for the top CF skin. (The 2 skins must be separate - the sound is terrible if you wrap the balsa all the way round with CF.)

I have no doubt Linn will come out with a better-sounding subchassis made from some different maerial, at some stage. :-))


Regards,

Andy


Edits: 09/22/16
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