Revox M 219 - Manual (Page 15)

M219 room amplifier Re:connect
14
[7] CHANNEL SELECT
Stereo/ Mono switch
Using the Channel Select switch, you can adjust the operating mode of
the two music (stereo) channels, to the requirements of the room where
the M219 is installed. Three operating modes are available:
1) Stereo
The left music channel is reproduces through the left speaker
connector and the right channel through the right connector.
2) Inverse stereo
After installation, it can occur that the left and right speaker
connections have been inverted or that the sound picture is not
correct for the normal listening position. In this case, a quick
solution is offered with the Inverse stereo operating mode, which
inverse the assignment of the left and right speaker connectors.
3) Mono
If only one speaker is connected to the M219, or if the M219 is
controlling two speakers, each in a different room, you should select
the Mono operating mode. This means that each speaker receives
all the music information.
The configuration of the Channel Select switches is described on the
next page.
[6] IN Voltage input (from serial # 2000 )
Using the voltage input IN on the M219, the local audio input LOCAL IN
1 can be activated by the application of 5 – 24 VDC. This means that as
soon as the voltage is present at IN, the M219 switches automatically to
LOCAL IN 1, irrespective of which source had been selected previously.
For further information please refer to DIL switch (3) / Page 10.
Please note:
The voltage input IN is galvanically isolated from the M219 with a
high-resistance (10kΩ) optical coupler. This stops any disturbances
from either side having any effect.