A:
Hi, Thanks for the great question. Free-space 51s are fine for using 2 pairs (4 speakers)..Each speaker pair connected to the amplifier requires power handling of 100 W and a minimum nominal impedance of 8 ohms. If using a single pair of speakers, each speaker must be a 4 ohm minimum. If using two pairs of speakers, each speaker must be 8 ohm minimum. Have a great day!