SMS1 Instruction Manual Rev C Page 8
Bi-Amp and Bi-Wire Operation
Bi-Amp Operation
Set the switch to BI-AMP when driving the tweeter and woofer from separate amplifiers. In BI-
AMP mode, two amplifier channels will be required for each speaker. A four-pole NL4 cable is
required for all BI-AMP applications. In BI-AMP mode, the passive crossover is split into separate
high and low frequency sections. Both drivers still receive the proper range of frequencies and no
external crossover is required. This topology simplifies the use of the BI-AMP mode while
protecting the drivers from incorrect wiring.
Bi-Amp Operation May Reduce Power Amplifier IMD
BI-AMP connections use separate amplifiers to drive the woofer and tweeter. With many
amplifiers, this will reduce IMD (intermodulation distortion) and may improve the sound quality.
Please note that it is not necessary to use a Benchmark AHB2 in BI-AMP mode. The AHB2 is
virtually distortion free, and the use of bi-amplification will not reduce distortion. However, bi-
amplification can offer an opportunity to add separate active filters for the high-frequency and low-
frequency drivers. In such a system, a Bi-AMP connection from an AHB2 will allow fine-tuning of
driver and room response.
Using Bi-Amp Mode to Add Correction Processors
BI-AMP connections provide an opportunity to fine-tune the frequency-domain and time-domain
response of the speakers and room using external active processing. This processing can be added
as an analog process (between the DAC and power amplifier), or as a digital process (before the
DAC). If the correction is digital, two channels of D/A conversion and two channels of amplification
will be required for each speaker. If the correction is analog, there is no need to duplicate the
number of D/A channels, but two channels of amplification will still be required for each speaker.
When using a Benchmark AHB2 for BI-AMP connections, connect the four-pole NL4 cable to the
"1&2" output connector on the AHB2. Channel 1 drives the woofer, channel 2 drives the tweeter.
Bi-Wire Operation
The SMS1 supports Bi-Wire connections when the speakers are set to BI-AMP mode. Bi-Wire
connections use separate conductors for the woofer and tweeter. Unlike BI-AMP connections, both
sets of conductors are driven from a common amplifier channel. Bi-Wire connections offer no
advantages when high-quality cables are used over relatively short runs. Bi-Wire connections may
be useful for long cable runs. Special two-pole to four-pole cables are required for Bi-Wire
connections. The high-frequency and low-frequency conductors must be connected together at the
power amplifier, but must be connected to separate pins in the NL4 plug at the speaker end of the
cable. NL4 pin assignments are shown on the rear plate of the SMS1.
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