Page 18 User Guide English
Installation and Operating Guide pro.Bose.com
The following chart shows examples of the types of loads possible with the required output mode:
Loudspeaker Load Output Mode Channel Sharing PM8500 PM8250 PM4500 PM4250
2 - 8 Ω Mono (Low-Z) None 500 W @ 4 Ω 250 W @ 4 Ω 500 W @ 4 Ω 250 W @ 4 Ω
4 - 8 Ω V-Bridge (Low-Z) Half block 1000 W @ 8 Ω 500 W @ 8 Ω 1000 W @ 8 Ω 500 W @ 8 Ω
70V V-Bridge (70V) Half block 800 W @ 70V 400 W @ 70V 800 W @ 70V 400 W @ 70V
100V V-Bridge (100V) Half block 1000 W @ 100V 500 W @ 100V 1000 W @ 100V 500 W @ 100V
2 Ω, high power I-Share (Low-Z) Half block 1000 W @ 2 Ω 500 W @ 2 Ω 1000 W @ 2 Ω 500 W @ 2 Ω
4 Ω, high power Quad (Low-Z) Full block 2000 W @ 4 Ω 1000 W @ 4 Ω 2000 W @ 4 Ω 1000 W @ 4 Ω
70V, high power Quad (70V) Full block 1600 W @ 70V 800 W @ 70V 1600 W @ 70V 800 W @ 70V
100V, high power Quad (100V) Full block 2000 W @ 100V 1000 W @ 100V 2000 W @ 100V 1000 W @ 100V
Note: Configure the output mode of the amplifier before connecting loudspeakers. See page 22 for details on front panel configu-
ration. Carefully follow the proper connection method for the selected output configuration.
The wiring of the connector varies by amplifier output configuration. The output terminal assignments for Mono (single channel) and
V-Bridge configurations are printed on the rear panel of the amplifier.
The following graphics illustrate wiring examples for the different output configuration modes. Mixed combinations of Mono, V-Bridge,
and I-Share modes are possible from one output block.
Figure 6. Output wiring showing the four basic configurations
Mono mode V-Bridge mode
I-Share mode Quad mode
Note: Changing the output configuration may automatically place the unit in Standby Mode to allow the safe installation of loudspeaker
cable connections to the rear panel output terminal blocks.
Note: While not optimal, a 70/100V loudspeaker load can be driven off a single channel in Mono mode but is limited to 50 V RMS / 71 V
Peak capability. Download the application note "Using Mono Mode to Drive High Impedance Loudspeaker Loads" from pro.Bose.com
for details on how to adjust software and tap settings for this derated use.
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