10.Connect the AC power into an outlet that supplies at least six amps (750 watts) dedicated to each MR1250f.
Caution: Never listen to sound that is distorted. If distorted sound is heard, turn the volume down immediately or speaker and/or amplifier damage could occur that is not covered by the warranty. If this problem persists, contact your dealer.
User adjustments and service: There are no user adjustments on the MR1250f. Your installer may make certain gain level adjustments on the rear panel.
Caution: The MR1250f contains no user serviceable parts, so do not attempt to open or repair the MR1250f. Refer servicing to a qualified technician only or contact the factory for information.
The trigger is 12 VDC (35mA per MR1250f) via 3.5mm mono jack. 5 VDC trigger outputs will not work. To connect the trigger to a receiver use a 12 VDC power supply (we suggest Knoll PS1202 power supply with an adaptor). Plug the power supply into the switched outlet on the rear of the receiver. Connect the 12 volt wire to a 3.5mm mono jack. Plug the jack into the rear of the MR1250f. 12 VDC polarity is not important. Make sure the amplifier power switch is off (out). When the receiver is switched on, the MR1250f amplifier is switched on.
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| Input |
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| Input |
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| Input | 12 VDC | |||
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| Trigger | ||||||
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| 1 | 2 |
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| 3 | 4 |
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| 5 | 6 | |
Output | L | Output Output |
| Output Output | L | Output | ||||||
| Gain |
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| Gain | Gain | L | Gain | Gain |
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| Gain | |
| R |
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| R |
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| 1L 1R |
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| 2L 2R | 3L 3R | R | 4L 4R | 5L 5R |
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| 6L 6R | |
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| MA1250 |
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Link (out position) |
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| 120 VAC |
cascades channel 1 |
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| 8 Amps | |
to chanels |
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Caution: NEVER connect the MR1250f to impedances less than 4 ohms or amplifier damage not covered
by the warranty may occur.
The Link button is normally set to the in 
position to give all six stereo inputs individual 
sources. When the Link button is set to the
out position, that input Left/Right is linked or
cascaded to input #1 (without the use of Y cords). Any or all combination of linked inputs 2 to inputs 6 are possible. When all inputs are linked to input 1 the input impedance is about 4000 ohms.