Yamaha P-2200/2201 - Manual (Page 39)

Fig. 63A - Input Splitter Transformer Setup to Operate P-2200 in "Mono" Mode.
Fig. 63B - Output Connections for Operating P-2200 in
"Mono" Mode.
In the "mono" mode, the P-2200 will produce a full
400 watts into a 16-ohm load. The voltage output from
the P-2200 in the mono mode is approximately 75
volts RMS, and since it can drive even highly reactive
loads with complete stability, it is suitable for driving
70-volt (constant voltage) commercial sound speaker
lines. In all but very small systems, the P-2200 can offer
cost savings when compared to multiple, low-power
amplifier installations. In addition, the P-2200's per-
formance specifications far exceed most commercial
sound amplifiers. Figure 76 illustrates a typical 70-volt
constant voltage system (also called a "distributed"
system since there are usually a number of speakers
distributed throughout a building).