Originally Posted by
lindaschipper
I also have the Janome MC6500P and love mine. As suggested, you may have the speed adjusted too high and are running too fast. Mine is set at the half way mark. To help insulate against noise and vibration, try to find an old typewriter rubber pad (Amazon?)...it worked for millions of typewriters it could be used for sewing machines also.
I don't have this machine, so can't really address the question, but when I saw lindaschipper's suggestion, a little light bulb went off: You could try a low-end yoga mat of the type that would be thin enough to cut with a utility knife or scissors to a useful size. If the machine vibrates against the table, even the most steady table won't help much.