One of the reasons why wood cabinets are not very good for electronics is that wood resonates at audible frequencies and it also transmits vibrations very well. The fact that the armoire is big and heavy does not solve these problems. Direct your efforts towards isolating the turntable inside the cabinet. And if the armoire has feet, try to have the feet over floor joists rather than on the floor between joists, where the floor will be more springy.
turntable location??
Here is my so called problem. I started to change and purchase new furiture getting rid of all press board type in the home for quility cherry wood and mahagony pieces. I found a beautiful mahagony all wood equiptment armour at a thrift for the unbeivable price of 130.00 the thing weighs in like a sherman tank and all gear fits in very well. Now here is my question, can I place inside on the heavy wood shelves a vpi Hw-19 TT with dust cover removed in an enclosed encloser or will run into trouble with any acoustic rumble or feedback, I know many will tell me just try it and see but just curious if any of my fellow Audiogoners have tried this with success?