Boulder Amplifiers Integrated Amplifier 865 - Manual (Page 13)

CONNECTING THE AUXILIARY OUTPUTS TO A
COMPONENT WITH UNBALANCED INPUTS
The 865 Integrated Amplifier’s balanced outputs can drive
unbalanced inputs with a cable having an XLR connector at the source
(865) end and an RCA connector at the load end.
A special cable required to make this connection connects Pin 1
to the shield and Pin 2 to the RCA center conductor. It leaves Pin 3
unconnected.
Connecting the unused Pin 3 to ground will cause excessive ground
currents and degrade performance. Use an ohmmeter or continuity
checker to determine how a cable is wired. The diagram of the proper
termination technique for this cable is shown below.
When using these outputs for bi-amplification into unbalanced
inputs and if the external amplifier has the standard 26dB of gain, the
loudspeaker outputs of the 865 will be 6dB louder than the external
amplifier.
GETTING
STARTED
1-7
UNBALANCED OUTPUT CABLE
3-NEG OUTPUT
2-POS OUTPUT
1-GROUND
LINE
PREAMP
INPUT