Owners Manual
Page 4
... Phone plugs for connection to the phone jack inputs should not be parallel-connected with minimum impedance of 8 ohms or 4 ohms. A pair of parallel-connected 8-ohm speakers have a total impedance of 4 ohms. The S112V/S115V/SM10V/SM12V/ SM15V/SW115V/SW118V are 8-ohm speakers, and two of these can safely be paralleled on one output.
... Phone plugs for connection to the phone jack inputs should not be parallel-connected with minimum impedance of 8 ohms or 4 ohms. A pair of parallel-connected 8-ohm speakers have a total impedance of 4 ohms. The S112V/S115V/SM10V/SM12V/ SM15V/SW115V/SW118V are 8-ohm speakers, and two of these can safely be paralleled on one output.