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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
ebm
9,311 posts
 
Have TW RAVEN AC1 SYMPOSIUM Ultra with Stealth top the best my far.Great bass,stage depth Highs,Wonderful midrange.
ebm
9,311 posts
 
Set up tips call Jeff of Highwater sound he set mine up wonderful!!
ebm
9,311 posts
 
Granite is very very bad rings like a bell!!
hifibri
39 posts
 
TW suggests slate for a platform, which can be seen in photo's on TW's web site. I don't think granite is the best material to use, although slate may not be the best either. I am in the process of trying different platforms as well. I have constructed a platform of 3" thick Baltic birch plywood (4 layers of 3/4 inch). I cut a void in one of the middle sheets and filled it with #12 lead shot (smallest size) and will Formica the top, I might also Dynamat the bottom. I purchased 2 pieces of custom cut 2" thick slate which will go on top of this. I’m going to listen to the table on the platform alone, then on the slate on top of the platform, then try a different platform made from some type of advanced resin. If I don't get too lazy, I am also going to experiment with points, Rollerblocks and Sorbothane in different places. Remember the ideal durometer and amount of Sorbothane depends on the weight it is supporting. You'll find pretty much all you need to know on Sorbothane's website. This is probably all overkill and there may be very little, if any, differences as the manufacturer indicates the table is not very sensitive to its support, as long as it's reasonable. I hope that gives you some ideas.
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