First Watt F4 Operation And Service Manual page 8

banded connectors are signal ground, and are not used. The positive speaker
lead goes to the left red band, and the negative speaker lead goes to the right red
band.
Mono Parallel Operation
In mono parallel operation, you can achieve up to 100 watts output into a 2 ohm
load. The amplifier is driven by a single-ended source, through the two RCA
inputs in parallel. The easiest way to do this is through a male RCA cable going
into one of the RCA inputs with a jumper between pins 2 and 3 of the XLR input
connector, which parallels the two inputs. This jumper is supplied with the
amplifier.
If you look carefully at the connector you will see tiny labels next to the pin holes.
For parallel operation of the two channels as one, you must connect the outputs
left positive to right positive either at the connectors themselves or by "bi-wiring"
the loudspeaker with two sets of cables. Remember that the positive outputs have
a red band.