Mozzerrocks,
I would not worry about the amp having more power than speakers can handle. It only becomes a problem if you plan to blast the amp at full power in a concert or big auditorium setting. The zensor 7 has sensitivity of 90 so you dont need much power to play at loud volumes anyway. I would just hook it to the 4 ohms. The nominal impedance is 6ohms but it will drop to 4 ohms or so when playing most music.
I would not worry about the amp having more power than speakers can handle. It only becomes a problem if you plan to blast the amp at full power in a concert or big auditorium setting. The zensor 7 has sensitivity of 90 so you dont need much power to play at loud volumes anyway. I would just hook it to the 4 ohms. The nominal impedance is 6ohms but it will drop to 4 ohms or so when playing most music.