M1.1 Two-channel Reference Power Amplifier

Traditionally, power amps have always been the simplest of audio components, at least on the outside: little more than a set of inputs, a set of outputs and a power switch. Until now.

“The M1.1 power amp is simply the most musically accomplished, high-powered solid-state piece it has been my pleasure to use. I love its configurable nature and I love the idea of adding additional amps along the way.”


Product Description

The problem is that although power amps themselves might appear simple, their job is anything but straightforward. Caught in a sandwich between the output of a line-stage or DAC and the load requirements and sensitivity of any number of different loudspeakers, they must be able to accommodate the widest range of partnering equipment and interface parameters presented to any unit in the audio system. Achieving optimum results under such varied conditions demands a capable and versatile performer – yet as we’ve already established, most power amps offer a single, brute force solution to the problems they face, instead of adopting a more sophisticated response. It’s time for a change – it’s time to meet the CH Precision M1.1, a new-paradigm in power amplification.

What sets the M1.1 apart? It goes without saying that the M1.1’s sonic and musical performance challenges the state-ofthe- art, an incredibly short audio signal path executed with exacting component choices and construction, a massive power supply providing absolute stability and unfettered headroom, capable of meeting both the most delicate and most massive musical demands. But what makes the M1.1 really different is its software driven housekeeping capabilities, a non-intrusive support network that does more than just keep the amplifier unconditionally stable.

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Physical And Conceptual Modularity

  • Modular input boards to match system topology
  • Output stage can deliver 200W RMS into 8 Ohms stereo, 200W mono (high-current), 700W mono (bridged) or 200W bi-amped (single input, differential channel gain and global feedback settings)

Analog Input Stage

  • Pure class A, fully symmetrical circuit topology
  • Fully discrete, ultra low noise, high slew rate design
  • DC coupled with no series capacitors in the audio signal path

Analog Output Stage

  • Pure class A ultra low noise driver and class AB pure follower power stage
  • Patented ExactBias circuitry ensures constant bias, independent of room temperature. Monitors output power, temperature and amplifier loading
  • User configurable display will show amplifier status, power output etc
  • Customized Argento internal wiring and loudspeaker binding posts (accept spades or banana plugs)

Power Supply

  • 2200VA power transformer mounted on separate, mechanically isolated chassis bed to eliminate mechanical vibration
  • Magnetically and electrostatically shielded transformers to reduce noise and EM interference
  • Hyper fast, soft recovery diode bridge rectifiers meet dynamic demands without strain
  • Total of 250,000uF custom-built, ultra low ESR reservoir and filtering capacitors

User Adjustable Global Feedback Ratio

  • Ratio of Global to Local Feedback can be adjusted from 0% to 100%, in 10% steps via the user interface or control app
  • Allows user optimization of amplifier/speaker interface, especially low frequency damping relative to speaker/room interaction
  • Each channel can be adjusted individually to control specific drivers/ranges in bi-amplification modes

User Adjustable Input Gain

  • Input gain can be user adjusted to accommodate input signal level and overall system gain 24dB range in 0.5dB steps
  • Optimizes system noise floor and dynamic range
  • Accommodates variations in loudspeaker sensitivity and room size

Light Touch Protection

  • No output relay in signal path; full short circuit protection
  • Non-invasive output stage voltage, current and temperature monitoring protects your amplifier – and your speakers

Optional Hardware

  • Monaural Analog Input Board – required for stereo and active applications

Technical Specification

Nominal input voltage
2.5V RMS balanced
1.25V RMS single-ended

Input impedance
94kΩ balanced
47kΩ or 300Ω single-ended

Output power
2x 200W / 8Ω, 2x 350W / 4Ω, 2x 600W / 2Ω in stereo and bi-amp modes
1x 350W / 4Ω, 1x 600W / 2Ω, 1x 1100W / 1Ω in monaural mode
1x 700W / 8Ω, 1x 1200W / 4Ω, 1x 1600W / 2Ω in bridged mode

DC to 450kHz (-3dB) at 1W into an 8Ω resistive load

Signal to Noise Ratio
> 115dB in stereo and bi-amp modes
> 118dB in bridged mode

Total Harmonic Distortion + Noise
< 0.1% (0% global feedback)
< 0.01% (100% global feedback)

Max power consumption

440 x 440 x 266mm (W x D x H), 71kg

M1.1 Specific Downloads

CH-Control App

Meet the CH-Control App – a control application that allows users direct access to every aspect of their CH system’s set up and use via any Android portable device. The software control systems used to set and monitor the operational parameters of each and every CH component offer the perfect opportunity for remote operation via a portable App.

To use the CH-Control App, all you will need is an Android device and to connect your CH components to an Ethernet network. That can be done either through the Ethernet control board fitted as standard to all CH units, or through the network streaming board that can be installed in C1.2, C1.2 Mono or I1 units. We would always recommend using a dedicated tablet and network for your music streaming and system control requirements.

Once your CH system is all hooked up, the App gives you touch screen access to every setting on every CH component, from your listening seat, a huge benefit when it comes to whole system set up or optimization for individual recordings. Either way, the CH-Control App allows you to make easier and more accurate judgements: Total control, quite literally at your fingertips.

The features of every CH product are accessible through the CH-Control App:

  • Built-in UPnP controller to stream dematerialized music, create playlists, etc.
  • Set volume level, select sources, reverse phase, mute, etc.
  • Access to all the advanced set-up parameters in every CH product.
  • Works on a standard Ethernet network.
  • The CH-Control App is freely available on Google Play.