8
Rear panel connections
1. FM/AM antennas
All tuner antenna connections are made here. Refer to the ‘Antenna
Connections’ section of this manual for more information.
2. RS232C
Used for control of the 651R/751R in Custom Install situations. A full
protocol is available for the 651R/751R on our website.
3. USB interface (751R only)
A USB B type socket is fitted to the 751R to enable the playback of audio
from a personal computer running either Microsoft Windows or Apple Mac OS
X operating systems. Some distributions of Linux are also suitable.
Note: Always use a high quality USB connection cable certified as USB Hi-
Speed. USB cable connections longer than 3m may result in inconsistent
audio performance.
See later section for full details on USB audio.
4. Opto inputs/outputs
Toslink digital inputs for Video 1, Rec 1, BD/DVD and CD sources and also
two Toslink digital outputs for Rec 1 and 2.
5. A/B HDMI outputs
Via the On Screen Display A, B or A and B outputs can be selected (for
connection to two TVs or a TV and a projector for instance).
When both outputs are selected both show the same content.
HDMI A also supports an HDMI 1.4 Audio Return Channel from TVs that also
support this feature.
This allows audio from the TVs own in built tuner to be received by the
651/751R. See later TV-ARC section for details.
6. HDMI
HDMI inputs compatible with the HDMI 1.4 standard. By Default the HDMI
inputs are assigned to BD/DVD, Video 1 and Video 2, with the 4th input
unassigned.
These inputs can be freely assigned, see later section on assigning video
inputs.
All video inputs whether analogue or HDMI are transcoded and output via the
HDMI outputs.
7. Video 1/2, Recorder 1/2, BD/DVD, CD and Aux
Please refer to the connection diagrams later in this manual for more
information on these inputs and outputs.
8. Heat tunnel vent grille
Allows cooling of internal circuitry via the 651R/751R’s proprietary X-TRACT
heat tunnel. DO NOT OBSTRUCT!
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Always turn the Volume to minimum, or turn the
751R off before plugging/unplugging cables to the
USB input or whilst booting up/shutting down your
PC/Mac.
