Zapco AG Reference-series - Manual (Page 53)

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Reference 360.4 Special Features
The 360.4 is the Reference Series smaller 4 channel amplifier. Like
the other Reference Series amps, it has a full-featured electronic crossover.
The 360.4, however, has two crossovers. They vary slightly from standard,
however at the signal mode switch. While other reference amps bridge to
the right channel, the 360.4 bridges the front channels to left and rear
channels to right. This allows you to switch the 360.4 for “Dual Mono” use.
You now have a stereo amp with 180 Watts RMS per channel.