I have the M60's and the EP350 sub on the floor. I have a 75 year old house with suspended wooden floors. I know there are various "isolation" options from homemade "sandboxes" to MoPads to outrageously priced spikes and feet. I also know what is used can potentially "color" the sound of the speakers. Hence my dilema. Anybody have similar architectural issues and/or ideas on isolating my wonderful speakers????