SURROUND OUTPUT CONNECTIONS
Your B & K preamplifier has two types of surround outputs: balanced (XLR) outputs and coaxial (RCA)
outputs. Both types of outputs connect from the preamplifier directly to the amplifier in the system. Either
type of connection can be used when connecting to the external amplifier. When connecting audio cables to
the amplifier, be sure to match the labeled output channel to the position of the speaker in the room.
7.1 balanced surround outputs are provided. Each balanced connector will click when locked in place. To
release, push in on the silver tab and unplug the balanced connector. Be sure to pull on the plug and not the
wire. Eight coaxial (RCA) surround outputs are provided. The RCA output section on the back panel is
labeled Surround Outputs. See
for a connection diagram using the coaxial connections.
For best acoustic results, be sure to set up the speakers using the speaker setup menu. To Setup System
Speakers see
7.1 Balanced Output Connections
To connect a 7.1 or 7.0 audio system using balanced cabling, see the connection diagram below. All seven
surround outputs should be connected to the amplifier. The point one (.1) indicates whether or not the system
will use a subwoofer. If a subwoofer is used, the Reference 51 Series2 has two subwoofer outputs, one
balanced (XLR) Subwoofer out and one coaxial (RCA) Subwoofer out, either can be used for connecting a
subwoofer into the audio system. If a subwoofer is going to be used, connect the subwoofer cable from the
subwoofer output to the subwoofer. The diagram below illustrates using a balanced cable to connect a
powered subwoofer.
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