The ISO-Pucks are designed to be used in multiples to match the weight of each speaker. Each unit is rated for up to 20lbs (9kg) so multiple units can be placed under each speaker. For smaller studio monitors 3 ISO-Pucks can be used, 2 front and 1 back. For heavier monitors, 4 ISO-Pucks or more can be used as required. The ISO-Pucks are designed to be used with the logo facing forward, as the isolators have been tuned to resist lateral movements resulting in greater clarity and focus.