Isolation platforms for turntables

There are 2 mechanical problems to deal with though I don't know what turntable you are using.

To solve a potential problem with footfalls causing the arm to dance across a record, mount the turntable on the wall (mine it to the left of the speaker system), or wedge the stand or furniture it is on to the wall behind it.

To test for feedback, place the needle on a stationary record and turn up the volume. If there is a howl, by far the cheapest solution is to visit a bicycle shop and purchase a small inner tube (14-18"), partially fill it, place a board on it and the turntable on top. Your feedback problems should be solved.

A further note: do not play records with the dust cover down. It tends to amplify air-born sound coming from the speakers.

Dctom wrote,

"I have built my own - very high mass plus anti vibration material and springs. I have no feedback issues at all now."

I'm a big fan of high mass/spring systems. One reason is they are rather uncomplicated plus you can obtain very low resonant frequencies. I'm also fond of dual-layer iso systems with two heavy masses, such as bluestone, and two layers of springs.

I've had excellent results with my Gingko Audio platforms. The difference between a Symposium platform and the Gingko was drastic.