Connect the right or left output from the audio source to the
right or left input of the zone you are bridging. Repeat this
for each zone you want in bridged mode.
The “BR/ST” switch should be in the bridged (BR) position.
Make sure the switch is in this mode only on the zones you
want bridged.
Connect the speaker cables coming from one speaker to
the “speaker input” connector on the back of the amplifier.
For bridging, one speaker will connect to one connector.
Make sure to follow the labeling on the back of the amp
where the speaker input connector is labeled for the
bridged zone. The speaker input connector is removable
to make connection easier. When connecting the cable to
the connector, check for any wire strands that might be
sticking out of the connection terminal that could cause a
short.
BUS 1 & 2 Connection:
The BUS inputs are used to input
audio sources such as a preamp, CD, tuner, and MP3
player over multiple zones. For example, you could have a
CD player on BUS 1 that goes to zones 1 and 2 and an
MP3 player on BUS 2 going to zones 3 and 4. The other
two zones could have independent input sources. When
designing a single-source, multiple-zone system, this
mode is perfect. Use a good quality RCA type patch cord.
Connect the right and left outputs from the preamp to the
right and left input connectors on the back of the amplifier.
Repeat this for each channel and or zone. Then, with the
zones on which you want to access one of the BUS
sources, put the input switch into the appropriate setting (1
or 2) position. Proceed to connect the speaker cable to
the amplifier as per the instructions in the “Stereo
Connection” section of this manual.
General Maintenance and Service
The front panel is finished with a high-grade anodizing
process to ensure that it maintains a flawless appearance.
Occasionally, you should wipe off any dust build up with a
damp, soft cloth.
DO NOT use any kind of cleaning solution or cleanser on
these units.
If for some reason the amplifier needs to be repaired,
please contact us immediately. We will issue a Return
Authorization Number (RA#) as well as a UPS call tag for
SYMPTOM
POSSIBLE CAUSE AND
TEST PROCEDURE
Very little or no sound
on some or all channels.
1. Check the SEN/ ADJ knob that it is not
turned down.
2. Check input switch is in correct position
settings.
3. Audio cable to the input is bad. Connect
the nonworking channel to a cable known to
be good.
4. Bridging switch is in the wrong position.
No sound on one
channel pair and zone
LED is red.
1. Check that connections are secure and that
there are no loose strands of wire crossing
from positive to negative terminals at the
2. Disconnect the speaker wire at both ends.
Separate the two conductors at both ends
and test with a meter for a short circuit. If
there is no short, connect the two conductors
at one end and test for continuity.
Hum from all the
speakers.
1. Hum can be caused due to a ground
components (especially those connected to
antenna or cable TV feeds).
2. Check for faulty cables, faulty source
signals, an ungrounded phono system, cable
feed, and/or a defective component.
3. Reverse the AC plug of the components
with non-polarized plugs.
4. Test the AC receptacle using a ground
tester.
Bass is weak and stereo
sound is “phasey”.
two adjacent channels are connected
normally but the bridging switch is set to the
bridged position, the two speakers will be out
of phase.
2. The speakers may be wired out of phase.
Recheck polarity and reverse the connections
on the back of one speaker if necessary.
Sound is distorted on
one or more channels at
normal volume.
1. Check the setting on the SEN/ADJ knob.
You may need to turn down controls.
the return. This unit should not be shipped back to
OSD Audio without the RA#.
DO NOT attempt to open or dismantle
this amplifier. THIS WILL VOID THE
WARRANTY!
MX 1260
4
LANDSCAPE
VIBRATIONS
Hi-Fidelity Sight & Sound
