12 Channel
Power Amplifier
Version 2.4
OPERATION
MANUAL
MR1250a
MR1250f
2
Congratulations and thank you for choosing the Knöll
MR1250a power amplifier. The MR1250a is designed to
meet the amplifier needs of multi-zone systems where
high quality sound is a specific requirement.
Key Features:
1. Size efficiency. The MR1250a consists of a total of
12 power amplifiers in one 3-1/2" high enclosure. Each
power amplifier channel can deliver 50 watts RMS.
2. Automatic protection circuitry. Each MR1250a
channel is individually and fully protected against low
impedance, overheating, overloading, overvoltage and
undervoltage. The protection circuitry automatically
restores the amplifier channel as soon as its parameter
returns to the safe operating area.
3. Individual input gain adjustment. Each channel
features an input gain adjustment pot to adjust each
channel for gain and speaker sensitivity variations. The
gain adjustments are on the rear of the MR1250a so
installers normally set the gain.
4. External power on/off. The MR1250a can be
turned off and on by external controllers such as the
MR640. To activate external power on, apply a 12VDC
current to the trigger jack (the MR1250a power switch is
in the off position for external power control).
5. Stackable 17" chassis. Optional RK1250 rack kit.
6. Link Feature. Certain installations require that some
or all of the stereo channels play the same content.
Instead of using Y cords, "link" cascades any or all of
channels 2-6 to channel 1 (l/r).
7. Optional fan version. For installations that require
a lot of "heavy" use we recommend the MR1250F with an
internal fan. A fan will help to avoid early protection
system distortion.
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