Warranty
Knoll Systems warrants MX1255 amplifiers sold in the USA and Canada by authorized Knoll dealers to be free of defects in materials and manufacturing. 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.
Specifications:
| Inputs |
| 12 Gold RCA jacks with adjustable gain |
| Input impedance |
| 50k Ω |
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| Outputs |
| detachable plug |
| Output power |
| 55 watts RMS per channel (8 Ω) |
| Bridged Power (channel 6) |
| 180 watts RMS (8 Ω only) |
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| Peak output power |
| 100 watts per channel (8 Ω) |
| Ideal impedance |
| 4 - 8 Ω |
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| 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 |
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| IMD distortion |
| less than 0.01% 60 Hz 7 kHz 4:1 |
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| Trigger control |
| 12 VDC 35mA on 3.5mm mono jack |
| Dimensions |
| 17" x 3.5" x 11.5" (432 x 89 x 292mm) |
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| Fan Noise |
| quiet 26 dBA |
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| Power |
| 750 watts at 117 VAC or 230 VAC |
| Weight |
| 21 lbs (9.5 kg) |
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Note: Specifications subject to change without notice.
Knoll Systems
145 Tyee Drive Point Roberts, WA 98281
Made in Canada/Fabrique au Canada
MX1255 Amplifier
12 Channel Amplifier
Installation Instructions v7.3
Warning: To be installed and/or used in accordance with appropriate electrical codes and regulations.
Description: The MX1255 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 55 watts per channels at 8 Ω, the MX1255 packs some serious punch. Each channel has a gain control. The MX1255 can be turned on and off via the front panel power switch or via the 12 VDC trigger. MX1255 channels
Key Features:
1.Size efficiency. The MX1255 consists of a total of 12 power amplifiers in one
2.Automatic protection circuitry. Each MX1255 channel is individually and fully protected against low impedance, overheating, overloading, over voltage and under voltage. 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.
4.External power on/off. The MX1255 can be turned off and on by external controllers via its 12 VDC trigger jack.
5.Stackable 17" chassis. 19” rack ears available.
6.Link Feature. Certain installations require that some or all of the stereo channels play the same content. Instead of using Y cords, the Knoll "link" cascades any or all of channels
7.Bridgeable. Channel 6 can be bridged giving 180 watts RMS into an 8 Ω load for use with subwoofers and speakers that need more power.
