FRS 5 - 8 ohm FRS 5 8 OHM FRS 5 X - 8 ohm FRS 5 X 8 OHM FRS 5 XTS - 8 ohm FRS 5 XTS, 8 OHM FRS 5 XWP - 8 ohm FRS 5 XWP, 8 OHM FRS 7 - 4 ohm FRS 7 - 8 ohm