Multi Room Audio Amplifier Installation Instructions
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3.3 Stereo Input Connection The rear panel connectors for the local audio input are labelled LOCAL IN. See
Figure 5. The high power amplifiers use RCA sockets and the low power amplifier
uses a 3.5 mm stereo socket. The LOCAL IN is for connection to line level signals,
normally labelled Audio Output on source devices.
Do not connect high-level speaker outputs from audio source equipment to the
LOCAL IN inputs on the MRA amplifier. These high level signals will overdrive the
input of the MRA amplifier and produce poor sound quality. Connect line level signal
sources only.
Optical Input (optional)
If you have a standalone high power remote amplifier, you cannot use the OPTICAL
IN and the LOCAL IN at the same time. If you wish to connect an optical source,
disconnect the LOCAL IN cables.
If you have a standalone desktop amplifier, you can connect both an OPTICAL IN
source and a LOCAL IN source. The Source switch allows you to toggle between
these sources. However, you cannot use the OPTICAL IN and the DIGITAL
AUDIO IN connections at the same time.
3.4 Digital Audio Cabling for Multiple Amplifiers You can connect two or more MRA amplifiers together using the digital audio
capabilities of the amplifiers. When connecting MRA amplifiers together, follow these
guidelines and refer to Wiring Diagrams and Figure 5.
• Only one source input can be active for all connected amplifiers. Attaching
multiple sources will cause poor audio quality.
• Each standalone MRA amplifier requires a power supply and speakers.
• Mark the digital audio cables so that they are not confused with C-Bus network
cables. Never plug C-Bus network cables into digital audio or LAN sockets, or
vice versa.
• If a 560110R Low Power Amplifier is connected to an upstream or a
downstream amplifier, use an RJ45 Tee connector, Catalogue Number
5600TEE, at the digital audio socket.
• When using multiple amplifiers, be sure to wire the positive and negative
speaker wires consistently to ensure the best sound quality. Also, you might
have to experiment with speaker placement for left and right channels to get the
best results.
• Install a ferrite filter on each digital audio cable.