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Warranty
MR1250f Amplifier
Knoll Systems warrants MR1250f amplifiers sold in the USA and Canada by
authorized Knoll dealers to be free of defects in materials and workmanship. This
warranty extends for three full years from the date of purchase by the original
consumer. Any products returned to Knoll Systems and found to be defective by
Knoll Systems within the warranty period will be repaired or replaced at Knoll
Systems decision, at no charge. Knoll Systems will not be responsible for the
actual cost of installation or removal of the product, nor for any incidental or
consequential damages. Some states do not allow the exclusion or limitation of
incidental or consequential damages, so the above limitation may not apply to
you. This warranty gives you specific legal rights. You may have additional legal
rights that vary from state to state.
12 Channel Amplifier
Installation Instructions v1.2
Warning: To be installed and/or used in accordance with appropriate
electrical codes and regulations.
Description: The MR1250f is a member of the long line of Knoll multi-
channel amplifiers. Designed primarily for the custom install industry, it
is used to power speakers with different or similar sources in multiple
rooms. With 12 channels rated at 50 watts per channels at 8 ohms, the
MR1250f packs some serious punch. Each channel has a gain control.
The MR1250f can be turned on and off via the front panel power switch
or via the 12 VDC trigger. MR1250f channels 3-12 can be linked to
channel 1-2 individually using the link switches. MA1250 amplifiers
designed to meet the amplifier needs of custom installed systems
where high-quality sound is a specific requirement.
Specifications:
Inputs 12 Gold RCA jacks with adjustable gain
Input impedance 50k ohms
Outputs detachable plug
Output power 50 watts RMS per channel (8 ohms)
Peak output power 100 watts per channel (8 ohms)
Ideal impedance 4 - 8 ohms
Frequency response 10 Hz - 40 kHz +/- 1dB (1w)
S/N ratio over 105 dB A weighted (50 watts)
THD distortion less than 0.1% 20 Hz to 20 kHz
IMD distortion less than 0.01% 60 Hz 7 kHz 4:1 (SMPTE)
Trigger control 12 VDC 35mA on 3.5mm mono jack
Dimensions 17" x 3.5" x 11.5" (432 x 89 x 292mm)
Fan Noise quiet 26 dBA
Power 750 watts at 117 VAC or 230 VAC
Weight 21 lbs (9.5 kg)
Key Features:
1. Size efficiency. The MR1250f consists of a total of 12 power
amplifiers in one 3-1/2” high enclosure. Each power amplifier
channel can deliver 50 watts RMS into an 8-ohm load.
2. Automatic protection circuitry. Each
MR1250f 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
MR1250f so installers normally set the gain.
Note: Specifications subject to change without notice.
4. External power on/off. The
MR1250f can be turned off and
on by external controllers. To activate external power on, apply
a 12 VDC current to the trigger jack (the
MR1250f power switch
is in the off position for external power control).
5. Stackable 17" chassis.
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).
Knoll Systems
145 Tyee Drive Point Roberts, WA 98281
12140 Horseshoe Way, Richmond, BC V7A 4V5
Tel: (604) 272 4555, fax (604) 272 5595
Made in Canada