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Hey gang.I've got a Lenco that I need to isolate from acoustic feedback. There's no spring suspension, & the factory plinth is just a simple wood box. Also, I have no wall space for a wall shelf in the area.
Here's what I was thinking: I was going to try fashioning a set of spring feet for the plinth using regular compression springs from the hardware store & small wood pucks. I'd cut out 4 round pads for the bottom of the feet from an old mouse pad.
Anybody tried anything like this before?
Follow Ups:
Get four 3 inch mylar balloons. (check out a party store or florist shop or on line).Get four used bicycle inner tubes and cut out the air valves. Insert the air valves into the neck of the mylar balloon. Seal with glue and wire twists. Place a balloon at each corner under your diy sandbox and pump up with a small bicycle pump.I have had my VPI mk iv on a sand box for over three years. No leakage of air, no refilling, no wobbling. I won't talk about the sonic improvements, but the ability to precisely level this rig is great.
regards
Jerry
springs and such are useless compared to isolation. I have a Linn that tried all sorts of things with, finally I hung it on the wall, problem solved. I also did it with my idler table, same result. The shelves will cost no more than your springs.
springs might also work like a suspended table and ruin your direct drive sound, it is surprising how much effect that kind of thing can have on a mechanical device.
Soundnut,
I had the same trouble about a year ago.When I would turn up the volume the table would pick up feedback and howl like a banshee!.
The worst place for my table (re-plinthed L-70 birch ply/mdf 60lb)was in the corner on a wall shelf.I thought it would be ideal there because my TD-150(suspended table)was fine there with half balls under it.
Simple solution!.Build a 4 to 6" deep sand box out of mdf and silicone the joints.Make the top about 1/2" smaller so it rests just on the sand,not touching the sides.Then get some cones on the Lenco.The other thing is getting it out of the corner were those nasty bass nodes reside.
You can walk around the room and your highest bass nodes are nearly always right in the corner.Sand boxes are great for isolation. The more sand the better!
I am using an inner tube purchased from Home Depot on my Plinth project number two table and it works more than decently well.
I inflate it only to the point it suspends the table level. I think damped springs would work too. Make sure to use foam inside the springs to cut any resonance.
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