Boulder Amplifiers 865 manual Getting Started

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.

UNBALANCED OUTPUT CABLE

2-POS OUTPUT

3-NEG OUTPUT

1-GROUND

LINE

PREAMP

INPUT

1-7

GETTING

STARTED