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About the support for the Rega: there is more than one way to skin a cat (strategies). But there is only one theory. In building construction it is called foundation technique. Foundation technique is all about distribution of stress, frequencies, mass and decoupling. If you suspend a 5kg mass on another 5kg mass once 1 is in resonance the other will follow. If you suspend a 5kg mass on a 50kg mass it will move with the same low frequency. If you suspend a 50kg mass on a 5 kg mass it will likely not move. And by suspend I mean springloaded with shockabsorbers.
There is a contradiction in above story. The Rega wall 'shelf' is actually coupled to a very heavy mass... the wall it is attached to. You can do the same with a pair of heavy duty (=triangular) wall brackets ($10 total) and something to level with.
The trick is to think about what you are doing, and just like I said: it is important to have a very different mass from the TT body itself. The Ikea-table is the other side of the scale (lighter vs heavier). I wouldn't use that on a wooden floor. It transfers all energy straight up into the arm. Every problem asks for a different solution.
The Ikea Lack table was actually promoted by Linn as the ideal stand for the LP12.
Wow, that is one beautiful cartridge!
The point I was making is that there is more than one theory as to how to isolate a Rega.
Some Rega users swear by a light, rigid platform instead of marble, just as I believe some owners of heavy plinth TTs like using a marble platform ie. heavy with heavy.
Most 'designed for Rega' platforms are acrylic with isolating feet.
My conclusion is that each solves it's own problem and might well create others.
I changed the feet on my Rega and now just use it on a heavy bookcase with no other isolation. Works just as well as with my acrylic platform...
The wall mounting is altogether different so it is really not a contradiction. It is designed to physically separate the TT from floor vibration, instead of provide a barrier between.
Yes one can make a DIY shelf, but to be really effective you'd want to weld in some cross bracings so your shelf and screws isn't providing the structural rigidity.
The Rega design (or any with a welded cross brace) is an improvement over basic wall brackets and screwed in shelf.
I'd buy a used Rega shelf from someone who decided they can't deal with a TT hanging on their living room wall.
I never heard of the Lack with the LP12. I only see the reference all over the UK Rega forums. Again I was only pointing out this other path, not promoting it.
Did I mention how beautiful your Koetsu is?