Whats the difference between the rubber bushings for the Standard vs. the Wide Electric Soft Motor Mount?
The soft bushings are ~10 durometer (about like warm bubble gum) and the firm bushings are ~55 durometer (more like a medium pencil eraser). They both filter high frequency, low amplitude vibration well, the main difference being that the softer bushing has a lower cut-off frequency (the frequency were the signal attenuation, in this case vibration isolation, begins to become significant).