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TW Raven Owners: Set Up Questions

Through the magic of sweet talk, I turned my Orbe into a Raven and mounted my Graham 2.2/Benz LP.
I am looking for a isolation base for the Raven. I have a 1 3/8" piece of granite coming soon so I can ditch the MDF I use now (a temp. meas.!) Symposium, SRA, HRS, etc., can anyone share their experiences with isolation bases? I saw the thread about loosening the Stillpoints.
Initially I had an issue with using the rough side of belt. The belt shimmied up/down on the pulley at a specific spot on belt. Also, the speed fluctuated and I could never get it dialed in with the PSU. So, I went to the smooth side of the belt and then raising the back side of the motor (unscrewing one of the isolation feet) slightly moving the belt down from "center" on the pulley. This moved me from 33.2 to 33.3 and I have no more belt shimmying and the speed is rock solid.
I'd appreciate any tips/tricks etc.
gerardff
whart's avatar
whart
3,086 posts
 
I use an HRS platform for my table- a big Kuzma that weighs about 160lbs. It will not isolate footfalls from a springy floor (which required more work including isolating the big antique table on which the whole affair sits). I would have preferred a wall shelf, but that wasn't feasible and would have required some real re-engineering, both of shelf and of system layout. The Stillpoints do a great job in decoupling vibration, but they are not really meant to address more dramatic movement like floor flex/footfalls, right?
(I have some ultra SS under one component and like what they do sonically).
Finite Elemente made a big shelf for wall mounting, but it ain't cheap. (The Living Voice folks seem to use those if you can find pictures of their factory listening room).
lula
213 posts
 
The Raven One weighs 21 kgs according to the Highwater Sound website.
pcosta
241 posts
 
Suteetat

I owned a custom Minus K for close to four years. I sold it. I found the improvements too subtle to consitantly notice the differences. I sold it after I moved my system to a floor made of concrete compared to an upper floor I had my system in previously. SO unless you have serious floor issues I don't think it is worth it.
Another thing to take into consideration is how big a top you need for an AC-1 because with a Minus K needs to have the load in the center of the table for it to work properly. Having an outboard motor may not allow you enough room if the top is not much bigger than the table.
If you do go with a custom top don't get it from Minus K. It is just a sheet of Aluminum that they will over charge you for.
suteetat
435 posts
 
Thanks for the input. If I go Minus K route, the custom top plate would be quite a bit bigger than the footprint of AC-1 exactly for the center of gravity issue. It is a bit unclear to me at this time though if there is an easy way to see if the center of gravity is properly aligned. If it is a matter of distributing weight until say, leveling bubble level on the platform, I think it can be done easily enough using additional weight

Wall shelf is not an option with my current setup as the nearest wall is not weight bearing and the location would not be anywhere close to weight bearing column.

Pcosta, since you have Raven AC, I assume that you used Minus K with your Raven AC?
pcosta
241 posts
 
Yes I used it only with my TW and I have only had one motor. It is easier to address the centering issues with the short belt for that table.
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