Exceptional Sounding MX2275e Stereo Amplifier


  • Stereo amplifier rated at 275 RMS watts per channel.

  • 3 different versions of control; Eco-System™, Eco-System™ with wall mount decora rotary volume control; Eco-System™ with full RS232 control.

  • Eco-System™ circuitry saves energy (and money).

  • Individual and automatic channel resetting protection for low impedance, overheating, overloading, overvoltage and undervoltage.

  • Two rack spaces (3-1/2") with optional rack mount version.

  • Individual level gain controls.

The Eco-friendly choice

Ladies dancing to loud music...The Knoll MX2275e is an exceptional sounding class A/B amplifier that produces 275 watts per channel at 4 ohms and 205 watts per channel at 8 ohms. While offering unparalleled reliability, power and sound quality the MX2275e offers a Knoll exclusive, the Eco-System™ circuit. This patent pending circuit determines when sound is required and delivers power only to the channel(s) needing it. The channels that are "off" are truly off, not in "standby" or "mute".

The class A/B amplifier design circuitry was chosen simply because of its obvious sound quality superiority over other high efficiency designs such as class D or H.

The most important feature of the Eco-System™ circuit is the electrical savings that is delivered to the owner over what a comparable class A/B amplifier will cost to operate. The typical home owner will see a savings of hundreds of dollars or more per year in actual electrical costs and that can be multiplied when taking into account the increased costs of air conditioning the home to extract unwanted heat produced by a typical amplifier.

A comparable amplifier without the Eco-System™ circuit (we should know, we manufacture a lot of them) uses about 14 times (65 watts) as much power while idling in standby. By comparison, the MX2275e with Eco-System™ uses under 5 watts while idling! Click here to review a recent white paper on the actual energy savings of Eco-System™ and its cost saving conclusions.

For more than 25 years, Knoll multi-channel amplifiers have sold around the world because of their legendary reliability and unparalleled sound quality. The MX2275e takes the next logical step by being eco-friendly. Please consider the environment when choosing your next system. The MX2275e cannot be mono bridged.

MX2275e Specifications:

Inputs Gold RCA jacks with adjustable gain
Input impedance 50k ohms
Outputs Detachable screw connectors
Output power 4 ohms 275 watts RMS per channel
Output power 8 ohms 205 watts RMS per channel
Peak output power 360 watts per channel (4 ohms)
Ideal impedance 4 - 8 ohms
Frequency response 10 Hz - 40 kHz +/- 1dB (1w)
S/N ratio over 112 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)
Dimensions 17" x 3.5" x 11.5" (432 x 89 x 292mm)
Fan Noise quiet 28 dBA
Power (standby in Eco-System™) less than 5 watts
Power (maximum) 900 watts at 117 VAC or 230VAC
Weight 22 lbs (10 kg)

Note: Specifications subject to change without notice.

Available Versions:

MX2275e Defeatable Eco-System™ stereo amp with rear panel adjustable gain.

MX2275v Defeatable Eco-System™ stereo amp with included wall mount decora rotary volume control connected by a single cat 5e wire.

MX2275rs Defeatable Eco-System™ stereo amp with complete RS232 control including volume, bass, treble, balance and power on/off.


iBoost Stereo signal booster for weak signal sources and when 2 or more MX850/MX1255/MX6120 are linked together a strong buffered stereo signal is provided. 10/20 dB boost.

MR100 Stereo preamp with wall mounted decorator style keypad. Adjustable bass, treble, balance and volume. Power on/off via keypad. Easy to install.

RACKMA Rack mount ears for a standard 19" rack is available. Occupies two rack spaces and we strongly recommend a blank space above and below the MX2275 for maximum power output.



          MX2275e user manual...