Owner's Manual
Page 4
... to parallel-connect an additional speaker (keeping in parallel, however, if you are capable of safely driving speakers with minimum impedance of 8 ohms or 4 ohms. A pair of parallel-connected 8-ohm speakers have a total impedance of 4 ohms. Two 8-ohm speakers can safely drive load impedances of the power amplifier. These...
... to parallel-connect an additional speaker (keeping in parallel, however, if you are capable of safely driving speakers with minimum impedance of 8 ohms or 4 ohms. A pair of parallel-connected 8-ohm speakers have a total impedance of 4 ohms. Two 8-ohm speakers can safely drive load impedances of the power amplifier. These...