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CH M1.1 User Manual

Two-channel reference power amplifier
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M1.1 Two-channel Reference Power Amplifier
User Manual

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Summary of Contents for CH M1.1

  • Page 1 M1.1 Two-channel Reference Power Amplifier User Manual...
  • Page 3 Dear Valued Customer, We are honored that you chose the M1.1 Power Amplifier for your audio system. Our team devoted every effort to design and manufacture this top quality versatile and future-proof product and is proud to present it to you. We hope your M1.1 Amplifier will bring you uncountable hours of emotion from your music collection.

  • Page 5: Table Of Contents

    3.4.5 Active bi-amplification mode..........................21 3.4.6 Daisy-chain mode............................22 4 Operation..................................23 4.1 Front panel controls..............................23 4.1.1 Front panel..............................23 4.1.2 Front panel push buttons..........................24 4.2 Operating modes..............................24 4.2.1 Normal mode..............................24 4.2.2 Shortcuts................................. 26 Rev 3.0 M1.1 User Manual...
  • Page 6 4.2.3 Menu mode..............................28 4.3 Configuration................................31 4.3.1 M1.1 configuration menu items........................32 4.3.1.1 AUDIO SETTINGS............................. 32 4.3.1.2 DISPLAY SETTINGS........................... 33 4.3.1.3 SHORTCUTS............................. 34 4.3.1.4 FACTORY SETTINGS..........................35 4.3.1.5 INSTALLED OPTIONS..........................36 4.3.1.6 NETWORK............................... 36 4.4 Returning to factory defaults............................. 37 5 Firmware update................................

  • Page 7: Technical Highlights

    USB flash-drive firmware update and Ethernet control capabilities. Like all CH Precision products, the M1.1is highly versatile: up to 5 setups are possible: stereo mode (one M1.1 driving a pair of loudspeakers), monaural mode (the power transformer of the M1.1is dedicated to one loudspeaker, only one output board is used), bridge mode (to nearly four times the available power), passive bi-amplification (each channel powers a specific loudspeaker driver or group of drivers) or active bi- amping (an active loudspeaker crossover is to be inserted between the preamplifier and the pair of M1.1s)

  • Page 8: Unmatched Flexibility

    The M1.1 offers unmatched system integration flexibility. Not only does it provide multiple modes of operation (stereo, monaural, bridge and bi-amplification modes) but also allows adjustments to match the loudspeaker impedance and sensitivity through feedback and gain controls. The operating modes can be selected from the M1.1 front panel user interface or from the Android app.

  • Page 9: Feedback Ratio Control

    1.1.3 Gain control The M1.1 provides an integrated gain control with a 24 dB range in 0.5 dB steps. It allows optimal matching of the loudspeakers sensitivity, room size, and preamplifier output level. In multi-amplification systems it can be used to match the sensitivity of the individual loudspeaker sections.

  • Page 10: Temperature Monitoring

    1.3 Careful construction The M1.1 power amplifier chassis is made of high grade aluminum alloy and steel elements with no visible screws on the front, top and side panels. The front panel, side panels and top cover are machined from aluminum, while the base plate is machined from solid steel, ensuring optimal mechanical reference and magnetic shielding.

  • Page 11: Monaural Analog Inputs: Analog_In Board

    ANALOG_IN board includes an XLR output providing a pass-through of the input signal. 1.4.2 Firmware update and control: CONTROL board The CONTROL board is factory installed into the M1.1. It provides a USB port for software updates using a flash drive and an Ethernet port for controlling the unit over a network.

  • Page 12: Read Carefully Before Use

    Please store the packaging material for future use. Check your M1.1 power amplifier for any apparent damage. In case of damage, please contact your authorized dealer. If your M1.1 power amplifier is still very cold from transport, please let it warm up to room temperature in order to avoid condensation inside the unit.

  • Page 13: User Manual

    2.4 Mains supply In order to use the amplifier to its full capabilities, the M1.1 needs two independent mains phases to be connected to the back panel. The power section being able to deliver up to 2200W, it is on the edge of exceeding the maximum current a traditional mains phase is able to deliver before the circuit breaker trips.

  • Page 14: Cleaning

    2.7 Maintenance and service The M1.1 power amplifier contains no user serviceable parts. Do not try to open, modify or repair your M1.1 by yourself. This will void any warranty. Your M1.1 power amplifier must be checked by a qualified technician in any of the following cases: The unit is not functioning properly •...

  • Page 15: Installation

    Installation 3.1 Unpacking Unpack the M1.1 power amplifier and store the packaging for future use. At least two people are required to lift the M1.1 as it is very heavy (over 75kg). 3.2 Positioning your unit We recommend to locate the M1.1 close to the loudspeaker it drives, using short loudspeaker cables.

  • Page 16: Connections

    This section provides information about how to connect your M1.1 power amplifier to your system. For details about how to integrate your M1.1 in a specific setup, please refer to the Amplifier modes section of this user manual. If you don't feel confident with the connections to be applied, please contact your authorized dealer for assistance.
  • Page 17 (17) (21) (20) (19) (18) M1.1 rear panel connections (1) Right channel negative loudspeaker terminal (customized Argento Audio connector) (2) Right channel positive (or bridged mono positive) loudspeaker terminal (customized Argento Audio connector) (3) USB port for software upgrades [CONTROL board]...

  • Page 18: Control Board

    USB port The USB port on the CONTROL board is dedicated to upgrading the firmware of the M1.1 unit. Do not use it for any other purposes. For more information on unit firmware update, please refer to the relevant section in this manual.

  • Page 19: Power Cord Receptacles And Voltage Selection

    A single M1.1 equipped with two analog input boards can be used as a stereo power amplifier. This is the simplest configuration that already allows to enjoy the unique sound of the M1.1 amplifier. The picture below shows how it should be connected in this case.

  • Page 20: Bridge Mode

    3.4.4 Passive bi-amplification mode In this mode, each M1.1 operates its two power amplification channels in parallel, each channel driving a different loudspeaker terminal from an identical signal. Feedback and gain can be adjusted independently for each channel to best match the individual speaker sections.

  • Page 21: Active Bi-Amplification Mode

    A pair of M1s, each with two analog input boards installed, can be used in active bi-amplification mode. In such a case, each output board of each M1.1 feeds the speaker's drivers of a given frequency range. This configuration is optimal when an active crossover network is used.

  • Page 22: Daisy-Chain Mode

    3.4.6 Daisy-chain mode When more than one M1.1 is used to drive a single loudspeaker, they can be daisy-chained. This allows for ultimate configuration taking advantage of the increased power available in Bridge mode as well as the flexibility coming with multi-amplification systems (optimal feedback ratio setting for each frequency band).

  • Page 23: Operation

    Operation The M1.1 Monaural power amplifier is operated either from the unit's front panel display and push buttons or from the CH Precision Android App available on tablets. The tablet reflects the state of the unit settings and allows the user to adjust the settings on the fly.

  • Page 24: Front Panel Push Buttons

    The M1.1 monaural power amplifier has two main operating modes: Normal mode and Menu mode. Normal mode is mainly used to display the M1.1 general status (such as power or temperature) whereas the Menu mode is used to configure the unit. The M1.1 also includes Shortcuts to quickly access preselected Menu items.
  • Page 25 (7) Amplifier mode (Monaural, Bi-amplification or Bridge) Displayed elements depend on the user settings. In the example above, the M1.1 is set as a bi-amplifying power amplifier, using the balanced XLR connector as input, with its outputs muted (in that example the power should actually display 0 W). Its internal temperature is 23°C.

  • Page 26: Shortcuts

    4.2.2 Shortcuts The M1.1 amplifier settings are accessible through a set of menus as described in the next sections. However, to allow quick access to the most frequently used configuration menu items, the M1.1 offers the concept of Shortcuts. Shortcuts are fully programmable and the user may choose any configuration parameter as a Shortcut.
  • Page 27 The last Shortcut (SETUP) is always the same and cannot be removed or altered. It gives access the Menu mode and the detailed setup of the unit. DETAILED SETUP EXIT ENTER DETAILED SETUP Shortcut screen Rev 3.0 M1.1 User Manual...

  • Page 28: Menu Mode

    4.2.3 Menu mode The Menu mode allows the Configuration and Setup of the M1.1 power amplifier through a set of menus. Menu mode is entered from the last Shortcut item (see above). From the Normal mode, enter the Shortcut mode by pushing the OK [R] button. By successive OK [R] button pushes, step to the last Shortcut item (DETAILED SETUP) and push the TOP [N] button once to enter the Menu mode.
  • Page 29 0 dB M1.1 SETUP >> AUDIO SETTINGS menu items (1) Menu title. M1 SETUP >> AUDIO SETTINGS shows that the parent menu is M1.1 SETUP. By pushing the CANCEL [Q] button, the unit returns to the parent menu. (2) This is the Parameter Value column. For each item in the Parameter column, the Parameter Value item on the same line indicates the current value of the Parameter.
  • Page 30 Parameters may or may not appear in the menu depending on installed options. For instance if only a single ANALOG_IN board is installed or an amplifier mode requiring two input boards is selected, CHANNEL selection menu items (to select the left or right input board) will be hidden. M1.1 User Manual Rev 3.0...

  • Page 31: Configuration

    4.3 Configuration Configuration of your M1.1 amplifier is accomplished by setting up parameters in the Menu mode (see previous section on how to access the Menu mode and how to navigate through menu items). The following diagram shows the complete menu structure (final items not shown).

  • Page 32: M1.1 Configuration Menu Items

    • 4.3.1 M1.1 configuration menu items 4.3.1.1 AUDIO SETTINGS The M1.1 SETUP >> AUDIO SETTINGS menu allows the configuration of the audio M1 SETUP >> AUDIO SETTINGS related Parameters of the unit. Accessible Parameters are: - GLOBAL FEEDBACK: Sets the amount of global feedback for output channels...

  • Page 33: Display Settings

    2 input boards + passive bi-amp or bridged mode Details of the AUDIO SETTINGS menu 4.3.1.2 DISPLAY SETTINGS The M1.1 SETUP >> DISPLAY SETTINGS menu allows configuration of the display M1 SETUP >> DISPLAY SETTINGS related Parameters of the unit. Accessible Parameters are: - DISPLAY MODE:...

  • Page 34: Shortcuts

    None gamma curve correction, +/-30% Details of DISPLAY SETTINGS menu Parameters 4.3.1.3 SHORTCUTS The M1.1 SETUP >> SHORTCUTS menu allows configuration of the Shortcuts. M1 SETUP >> SHORTCUTS Accessible Parameters are: - SHORTCUT1: Defines action for Shortcut #1 SHORTCUT 1...

  • Page 35: Factory Settings

    The M1.1 SETUP >> FACTORY SETTINGS menu allows to get information about M1 SETUP >> FACTORY SETTINGS the current M1.1 firmware version, to update the M1.1 firmware and to reset the unit to its default configuration (or subset of settings).

  • Page 36: Installed Options

    Parameters are Read Only Details of INSTALLED OPTIONS menu Parameters 4.3.1.6 NETWORK The M1.1 SETUP >> NETWORK menu display the information and allows the M1 SETUP >> NETWORK customization of the network related Parameters of the unit. Accessible Parameters are:...

  • Page 37: Returning To Factory Defaults

    Power-over-Ethernet switch. Standby mode will draw less than 0.5W from the mains plug. If Yes is selected, the M1.1 can always be woken up by the app. Standby mode will draw a couple of watts from the mains plug.

  • Page 38: Firmware Update

    5.1 Preparing the USB stick The firmware of all the CH Precision units can be updated using the USB port located at the back of the unit. Before starting the firmware update, it is necessary to load a USB stick with files containing the new firmware. Use the FAT32 formatted USB 2.0 stick provided with you M1.1 .

  • Page 39: Emergency Firmware Update Procedure

    5. If the emergency firmware update procedure fails, try the same procedure again using a different USB stick. If the failure persists, turn off your unit and contact your authorized dealer for assistance. Note: The emergency firmware update procedure lasts 5-10 minutes, do NOT interrupt it! Rev 3.0 M1.1 User Manual...

  • Page 40: Troubleshooting

    Check that the correct amplifier mode is engaged No sound Your M1.1 is muted (display area 3 7 must be off for the unit to output signal). Unmute the (“7” is displayed) unit using the top front panel push button...

  • Page 41: Specifications

    USB port for software update / Ethernet based system control Design and Specifications are subject to change without notice. Weight and dimensions are approximate Illustrations are informative only and may differ from the actual production model Enclosure designed by Mana Ishoni Rev 3.0 M1.1 User Manual...
  • Page 42 Should you dispose this component please do so in conformity with local and global legal and environmental regulations and according to best practices. We strongly encourage you to recycle any batteries used with this component. M1.1 User Manual Rev 3.0...

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