Instruction Manual for DAC2 HGC and DAC2 L with
2.X Firmware
Page 16
device. The DAC2 can be connected to the
first trigger input at the beginning of a trigger
chain, or it can be connected to the last
trigger output at the end of the chain (less
common).
Typical trigger applications:
•
DAC2
→
Amplifier
•
DAC2
→
Amplifier
→
Amplifier
•
DAC2
→
Preamplifier
→
Amplifier
•
AVR
→
DAC2, and AVR
→
Amplifier
(AVR with 2 trigger outputs controls
DAC2 and power amplifier)
Trigger Bus Applications
The Benchmark bi-directional trigger system
also supports multiple trigger ports wired
together on a bus.
A group of Benchmark trigger ports can be
connected to a group of non-Benchmark
trigger input ports to form a single trigger
bus. A bus should never be connected to
more than one non-Benchmark trigger output
port. If an output port is connected to the
bus, this device should be used to start the
audio system.
Benchmark AHB2 power amplifiers have two
trigger I/O ports that are wired in parallel.
This makes it easy to connect more than one
power amplifier to a trigger bus. Connect a
trigger cable between the DAC2 and the first
amplifier. Use another trigger cable to
connect this amplifier to the next amplifier.
Any number of Benchmark amplifiers can be
added to the trigger bus. The DAC2 will turn
on first, and after a delay, all of the amplifiers
will turn on together.
Bi-Directional Trigger Applications
Benchmark products support bi-directional
communications over a trigger bus. Any
Benchmark product connected to the bus can
turn the entire system on or off. Because of
the bi-directional design, any power button on
a Benchmark DAC2 or AHB2 can be used to
start or stop the system.
The Benchmark device that starts the system
will become the trigger master. If the trigger
master is turned off, all slave devices will
follow. If a slave device is turned off, all other
devices will stay on.
If the DAC2 is used to turn the system on,
any connected AHB2 amplifiers will become
slave devices and they can be turned off
without shutting down the DAC2. This feature
makes it easy to turn the AHB2 amplifier(s)
off when listening to headphones.
Slave devices can force the entire trigger bus
to shut down if the POWER button or OFF
button is pressed and held for 3 seconds.
Trigger Specifications
The Benchmark 12V TRIGGER I/O has a
wide operating range to allow interfacing with
most other DC trigger systems. It should only
be used with trigger inputs that are designed
to tolerate 12 VDC.
•
12 VDC 200 mA current-limited output
•
Input responds to 3.3 V logic and
higher
•
Maximum input voltage = 30 VDC
•
Maximum reverse input voltage = -0.3
VDC
•
Input Impedance = 20 k Ohms
•
1/8" (3.5 mm) TRS jack
•
Tip = 12 Volt Trigger I/O
•
Ring = no connection
•
Sleeve = chassis ground
HT Mode
The HT mode sets the volume control to a
calibrated level that is near its maximum
setting. In HT mode the analog gain is set to
0 dB (unity gain). Likewise the digital
attenuation is set to 0 dB (maximum output).
The HT light is illuminated when the HT mode
is active.
Each input channel can be programmed
individually by pressing and holding the mute
button for three seconds. In HT mode, analog
inputs are passed at unity gain, and digital