Polk Audio RM30 Satellite Speaker with Stand (Single, Pewter) Single satellite speaker for the RM series 6.1 or 7.1 channel speaker system Equipped with dual 4.5-inch mineral filled polymer composite midrange drivers Frequency response: 95 Hz - 24 kHz Equipped with a single 1-inch silk/polymer composite dome tweeter Bolt-on swivel wall-mounting brackets with hidden wire channels