AHB2 Instruction Manual Rev F Page 12
Bidirectional 12 Volt Trigger
Benchmark has reinvented the 12 volt trigger by adding bidirectional signaling. The trigger
connection on the AHB2 can be used as an input, an output, or both. It is compatible with any
common 12 volt trigger input or output. The 12V TRIGGER can be used to turn the AHB2 power
amplifier on or off automatically in sequence with other audio system components. The AHB2 can
also turn other connected components on and off.
Linking Multiple Audio Components
Two or more AHB2 power amplifiers can be linked together with 12V TRIGGER CABLES, so that
all units power up and down together. This group of amplifiers can be linked to a group of
Benchmark DAC2 D/A converters. In such a system, any power button can be used to turn the
system on or off.
Trigger Wiring
The AHB2 has two bi-directional 12V TRIGGER I/O jacks. These jacks are 1/8" (3.5 mm) TRS
connectors. The tip is wired to the 12V TRIGGER I/O bus. The sleeve is wired to chassis ground.
There is no connection to the ring.
Trigger Cables
The AHB2 includes one 3-foot (1 m) 12V TRIGGER CABLE. This cable has a 1/8" (3.5 mm) TRS
connector at each end.
Automatic Power-Down Feature
45 Minute Timer
The AHB2 has an audio signal presence detector on each input channel. If no audio is detected for
a period of 45 minutes, the AHB2 will automatically shut down to save energy. This feature is
required by law in many countries, and can contribute to significant energy savings.
Activates the 12V TRIGGER
When the AHB2 executes an automatic power down, it will pull the 12V TRIGGER low to shut
down any equipment attached to the trigger bus.
No Warm-Up Required
Unlike most power amplifiers, the AHB2 reaches its full rated performance very quickly. Full rated
performance is reached in less than one minute. For this reason, there is absolutely no reason to
keep the AHB2 powered on when not in use. The feed-forward error correction circuits in the
AHB2 keep it very stable over a wide range of operating temperatures.
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