FRS 7 - 4 ohm FRS 7 - 8 ohm FRS 7 4 OHM FRS 7 4OHM FRS 7 8 OHM FRS 7 A - 8 OHM FRS 7 A, 8 ohm FRS 7 S - 8 ohm FRS 7 W - 8 Ohm FRS 7 XWP - 8 OHM