Simple & Cheap Way to Cut Turntable Vibrations
Here's some commercial products... FIM Platinum Isolation Bearings Symposium Rollerblocks Rollerblock Jnr. Isobearing Designed not to roll away :-) |
Nandric, I went out to buy canned sauer kraut in water and decided, right there in the supermarket, that the Mandarin orange slices would be better, because there was more water in the cans and they are heavier. Turns out, the canned sauer kraut is just barely moist. That would not have been as efficacious. However, on a hot dog, I prefer sauer kraut over Mandarin orange slices. Had I chosen sauer kraut as a footer, what would you have recommended as a musical complement? Would have to be Wagner, I think, a sour kraut if ever there was one. |
Lewm - you are absolutely right - I don't want the turntable to move sideways - I want it to stay motionless while the stand is vibrating. So, the hi-fi stand has a sideways component to its vibration (i.e. music induced vibrations) the ball bearing/sorbothane will absorb it by moving ever so slightly under the turntable dissipating the energy, leaving the plinth staionary. The sorbothane also takes care of virtical vibrations It works very well for heavier Turntables like mine. I do get a faint thud if I stamp my foot on the floor, but even kids moving normally in the room has no effect. I tried the squash balls for a number of years, but they never come close to this method for isolation. Of course there are serveral commercial variants available if you want to spend more cash - like - Iso-Pod Isolation System - Vibration Isolation (ball Bearing) Damper - Vibropod - etc... You do have to "tune" the system to the component e.g. when I first heard how well one layer of sorbothane worked I figured two layers would work better - WRONG. It sounded aweful, so I settled on one layer of 1/10" sorbothane for my turntable feet. Heavier items like amps might do better with silicone sheet, but the gear I have works well with sorbothane. I found ball bearings worked better than cones, because the cone anchored the foot, whereas the ball has no point so it does not act as an anchor. Anyhow - Back to the music ! |
If you want something that won't end up with squished balls and won't roll off the table/stand, here's a little DIY project that costs about $10 For Diagram See DIY Isolation Feet and scroll to bottom. Initially I just used two-sided tape to hold my balls in place on the washer, but I've since used epoxy to attach them - no rolling away any more :-) In place of sorbothane you can use silicone sheet - i.e. a silicone oven glove from any $Dollar store. If you can't get Ball Bearings, while you are in the dollar store pickup some glass marbles. I currently 1.25" marbles as my turntable feet - stole them from my nephew :-) I use this in conjuntion with my DIY Isolation Shelf Tweak Hope it helps |
I disagree. Nothing is perfect but the balls btwn the table and the stand, with the TT feet touching, absorbs vibration. Case in point. I have a vacuum record cleaner that vibrates. I can feel it in the floor near the stand. I hear it. It is vibrating. Now, I placed the balls captured there between the cleaner and the table and magically the machine is quieter and the floor doesn't shake. The cleaner is partially suspended - by the balls! It works, try it! -Mike |
Mike, Whatever floats your boat is fine. However, it would seem to me that having the feet touch the shelf defeats the purpose of the balls, to a degree at least. The TT feet afford an energy path that bypasses the balls, in both directions, altho a well designed TT foot could ameliorate the problem (in which case maybe you don' need no stinkin' balls). Geoff, I used to know Dave Hadaway, the proprietor of DB Systems, 30 years ago when he lived near me. He is a very smart and creative guy. It seems to me he suspended his entire turntable from the ceiling using very long springs of some kind. It was quite a sight to see. I have no idea how he could level the turntable or whether he dampened the spring action. But the concept of isolating the turntable was way ahead of its time. |
Herbie rates his balls according to the load they will tolerate. I think he sells at least two types that differ in differ in size and possibly elasticity, to account for variation in mass. Since his balls are relatively inexpensive and since he has made the determination of appropriate mass for each product for us, I would tend to choose his stuff, rather than some random balls from a sporting goods store or hardware store. Plus, you get the cups that keep the balls and your precious turntable from rolling around. Don't get me wrong; I am as much of a DIY anarchist as anyone, but sometimes buying the commercial product does make sense. |
A lot of graduate school engineering labs employ bungee cords for isolation, you know, rather than try to justify the high cost of a real isolation device to the powers that be. Bungees provide a nice smooth mass-on-spring iso system. The trick for audio application of bungee cords is to figure out (1) the springiness of the bungee cords required and (2) how to suspend the damn bungee cords, you know, other than from the ceiling. |
My balls squashed completely. I had a dozen or so under each of two concrete paving slabs, one for the TT and one for the CD player, and the weight was too much for them. (Insert joke of choice here.) The squash balls now look a bit like big red blood cells. In any case, I wasn't sure they were doing anything for isolation anymore, so I now use an inner tube under each paving slab. Since I first read this thread I've added the felt pads--they work! And if anyone else uses innertubes, try a tube with a presta valve (you can get them at any bike shop or from Amazon)--they hold air better than standard Schrader (automotive) valves. You might need a presta adapter ($.99) if you have only a standard pump... |
Yup squash balls under my VPI too. However I did it a little differently. Put the TT on a maple butcher block cutting board, then put about 9 squash balls between that board and the table top, making a cheap man's Ginko Cloud. You can rearrange the balls to put more under the heavier table spots, like the motor, to balance it out. Over time these compress much more than initially, so you should check your level from time to time and adjust. This setup passes the knuckle wrap test (stylus in a groove, record not spinning, rap on the supporting table top/leg - no sound through the speaker). Enjoy, Bob |
Yes I am serious. The squash balls work great! They are designed to do just what we want them to do in our application. Absorb vibration and convert it to heat. One thing I would add. You want the balls to compress under the weight of the supported equipment enough that the feet of the equipment do touch the supporting shelf or table, what-have-you. Give it a try. I think that you will be pleased with the effect. |
Bifwynne, Mike has a good idea. Essentially Herbie's Audio "Isocups" with "Supersonic Hardballs" are naught but small "dead" squash-like balls. And they should work well. The Herbie's part is cheap enough to consider, and the cup he supplies will keep your balls from rolling off the shelf, if you will pardon the image. Phasecorrect, Thanks for your support. Have you tried it? I use Stillpoints feet with their supplied cups, but I mount each of the 3 feet on a stiff sheet of plexiglass which sits on a 3-inch thick piece of industrial styrofoam packing material (3 separate rectangles of the styrofoam, one for each footer). The plexiglass is a practical necessity; this particular turntable is so heavy (~90 lbs) that each footer was slowly deforming the "styrofoam", after long term settling in. This rendered the turntable out of level. The plexiglass just distributes the mass of the tt over a wider area of the styrofoam and keeps the level adjustment stable. The whole thing sits on a composite granite Adona shelf in an Adona rack. (So I guess this system is disqualified from "cheap". However, the styrofoam packing material was free.) |
I have a Technics 1200 MK5 with an Audio Technica 150 MLX set up on a glass shelf in an equipment rack. Could hear vibration when I tapped the tt deck or side. Tried Sorbothane 1.5 inch half spheres. The vibration went away. Got a 1.5 inch thick piece of butcher block to replace the glass panel. Also added Dayton Audio gold speaker feet. Could not detect a difference between the two approaches but did free up the sorbothane feet to better isolate the CD player - they helped there too. I run W4S pre and amp with maggie 3.6's. |
Here's the thing, Doug. If the cans didn't work, I could always eat the contents. For $3 per footer, you can't go wrong. But I confess I in a sense spent a little more than $3; I had some truly "audiophile" Black Diamond Racing carbon fiber tiptoes lying around, so using double-sided tape, I fixed a tiptoe to the bottom of each can. Thus the weight is borne by the tiptoe and it transmits force to the bottom of the can but not the rigid edges of the can. The thin slightly flexible tin that comprises the top and bottom of a can provides a touch of springiness with a resonant frequency probably close to 2-3Hz, certainly less than 5Hz. And energy imparted to the bottom of the can is dissipated in the contents of the can, which being heterogenous and "chaotic" will easily dissipate it. I should probably market this, only instead of calling it "Mandarin orange slices in water with a tiptoe glued to the bottom", I would call it.... well, for that I need a PR guy. |
A few years ago, I was visiting a waterjet cutter who was cutting slate for me. He does a lot of work (most of his work) for industry. Around his shop were sheets of very stiff and very light black styrofoam, much higher in quality and structural stability that what we find in soft drink containers, for example. The sheets are 3 to 4 inches thick, and are used to ship very heavy yet fragile materials. He gave me lots of it, and I find it is very effective in isolating my Technics SP10; I put a rectangle of it under each of the three footers, between the footers and the shelf. I believe the stuff is quite analogous to a Neuance shelf, now sadly no longer available. I am always looking for stuff like this; there is no need to spend big bucks for good foundations, IMO. (See elsewhere my tt feet made from cans of Mandarin orange slices in water.) |
Good one. But you are creeping me out Bro. :-) I have a number of these that I purchased at Homedepot and I've also used them to help with the various acoustic problems that I've had with my audio devices. I mostly used them under my pre/power amps and components, all to good effect. M~ The Aries-3 will be here soon. |
IKEA table is the worst place to put any audio equipment, especially a TT. I can't disagree more with your statement concerning the Ikea Lack table..they the tables are excellent and because of they're light ridged design. Are more than adequate to support and isolate most tables at a very reasonable price. |
Its amazing to me how many here seem to have issues with feedback to their turntables. Perhaps it is because so many use ridgid tables rather than suspended tables. I havent had any such issues with my Sota Cosmos or Oracle Delphi. For furniture stickies to make such a large difference in quality for the OP suggests that there wasnt much there to start with. |
