AHB2 Instruction Manual Rev F Page 10
3. Connect the Audio Inputs
There are two balanced XLR audio inputs on the AHB2:
1 IN/MONO IN
2 IN
Special adapter cables are required if balanced sources are not available. The adapter cables
extend a three-wire balanced connection back to an unbalanced RCA output. The adapter cables
are available from Benchmark.
Use 1 IN/MONO IN for the left channel of a stereo system.
Use 2 IN for the right channel of a stereo system.
Use 1 IN/MONO IN for all MONO mode applications.
Please note that unbalanced sources will limit the overall performance of the playback system. This
is not due to any limitations in the AHB2. It is due to the noise limitations of unbalanced output
drive stages. High-level balanced interconnects are required in low-noise systems. We highly
recommend balanced interconnects.
4. Connect the Speaker Outputs
The AHB2 has twist-lock NL4 SpeakON connectors that provide very high-quality speaker
connections. These connectors outperform most binding posts, have very low resistance, and are
designed to reliably carry high current. These jacks are compatible with two-pole NL2 plugs or four
pole NL4 plugs. For best performance, make all speaker connections using twist-lock SpeakON
connectors. Binding posts are included to provide compatibility with existing speaker cables.
Use 1+ and 1- for the channel 1 output in STEREO mode.
Use 2+ and 2- for the channel 2 output in STEREO mode.
Use M+ and M- for the output in MONO mode.
The 1&2 OUT NL4 jack provides access to channels 1 and 2. If an NL2 plug is inserted into this
jack, it will have access to channel 1 only. Use this jack with a two-pole cable to connect the
channel 1 output to the left speaker in a stereo system.
The 2 OUT NL4 jack provides access to channel 2 only. Use this jack with a two-pole cable to
connect the channel 2 output to the right speaker in a stereo system.
The BRIDGED MONO OUT NL4 jack provides a dedicated output for bridged mono applications.
Use this jack with a two-pole cable to connect the bridged output to a single speaker.
The 1&2 OUT NL4 jack can also be used for biamp applications. Use this jack with a four-pole
cable to connect both output channels to the high and low drivers in a biamped 2-way
speaker.
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