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Oh the magic of damping

post #1 of 12
Thread Starter 
Sorbothane is magic. Over the weekend I disassembled my self-made IKEA rack construction, for three reasons.

Reason 1: The little adhesive silicone feet I used to isolate the top deck with turned out not to be as adhesive as expected, the whole thing drifted like a glacier on the shelf-back I had mounted on the bottom deck due to vibration.
Reason 2: It therefore looked incredibly ugly.
Reason 3: I did not like the way it made the rig sound.

So what to do, I have two rather big boards and round about 20kg of equipment. At first I got rid of that horribly ugly shelf-backing.

Idea, I still have a bunch of those fat sorbothane feet I use to isolate my source and Cosmic with. So I took three of those (had to steal from the Cosmic) and put them in between the boards. One in front, two in the back. Perfect look, as if the top deck was levitating.
Soundcheck. Peter Gabriel - So, SACD. Incredibly strong bass. Incredibly shrill highs, out of control. Incredible lack of soundstage.
Bad. Very, very bad. Sound was better when the rig sat on the plain carpet.
Remebered about endless damping product site readings, put in two more sorbothane feet today thinking that three of them might not be enough to compensate for the weight.
Soundcheck. Peter Gabriel - So, SACD. Magic done. Bass still strong but more pronounced now. Highs still a tad shrill at insane levels, but great at normal volume. Remembered that "So" might be a bit on the high side anyway. More testing with other material made me confident about this idea. And, finally, soundstage has returned to my speaker setup, and very much so. The whole thing returned to sounding more contoured and controlled now.

Looks are still neat (if it wasn't for the ugly black MD-Deck I put up again in the vague hope of needing its DAC for my yet to come AirPort Express setup)

Now I just have one problem. I am running out of sorbothane. I want to put the remaining three feet from under my source in between the shelves, hoping for even smoother highs and possibly wider soundstage. Then I just lack something to put under my source, and I am not going to put the original feet back on. Basically I need six feet, three for my DVD-2900 and three for my Cosmic. So much for cutting back on putting money in the rig.

What are your ideas about sorbothane?

Edit:
I took some shots of the rig, you can see them here (password is headfi)
http://service.gmx.net/mc/8rVPmLEq53...utwnm7gFWZ9XAt
There is also a slideshow.

They do not really look as ******, it's the &%$!ยง GMX interface.
post #2 of 12
PANDAFEET! Read my favorite site on sorbothane

http://www.pandathumbaudio.com/

There's more to it than just random feet
For speakers though, Gary recommends thin sorbothane pads from mcmaster carr.
post #3 of 12
Thread Starter 
Quote:
Originally Posted by ooheadsoo
PANDAFEET! Read my favorite site on sorbothane

http://www.pandathumbaudio.com/

There's more to it than just random feet
Ahh, those look very promising. I will have to do some calculations and talk to Gary once I've done them. Great hint, thanks a lot!
post #4 of 12
I've had mixed results with Sorbothane. Sorbothane is rated for specific mass loads; it's not a one-size-fits-all medium. Improperly loaded, it'll actually amplify vibrations. It quickly became an exercise in frustration trying to get Sorbothane to work right. I now use and prefer cones, sandboxes, and ball-bearing devices.
post #5 of 12
Thread Starter 
Quote:
Originally Posted by Len
It quickly became an exercise in frustration trying to get Sorbothane to work right.
Isn't it more like a one-time setup with some math involved, for a fixed setup I mean? Please tell more about your problems. I am still exited that the placing of two more pads can make a 100% difference from nasty to great.
post #6 of 12
If you set it up properly the first time (whether by design or luck), it'll do fine for a while. Sorbothane does change physical characteristics over time, but it's a gradual change.

Hey, if it works well for you, don't question it I personally found sandboxes, rollerballs, and cones a lot easier to apply (and with better results).
post #7 of 12
Quote:
Originally Posted by ooheadsoo
PANDAFEET!
That's cruel
post #8 of 12
Gary's white paper is interesting. Worth a read. Apparently, the sorbothane only deteriorates over time when overstressed.
post #9 of 12
Thread Starter 
Bump, now with pics!
post #10 of 12
well, let's see them, then!

Oh, you put them in the orig post
post #11 of 12
Thread Starter 
Quote:
Originally Posted by ooheadsoo
well, let's see them, then!

Oh, you put them in the orig post
Okay, okay, for your ease of browse...
http://service.gmx.net/mc/8rVPmLEq53...utwnm7gFWZ9XAt
The password is "headfi". Please try and ignore the ugliness of GMX.
post #12 of 12
I second the Pandafeet, Gary is very good to work with, and will help you get the right mix of goodies.

I use them under my Mensa.

mark
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