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Related Manuals for CH A1.5
Summary of Contents for CH A1.5
- Page 1 A1.5 Two-channel Power Amplifier User Manual...
- Page 3 Dear Valued Customer, We are honored that you chose the A1.5 Power Amplifier for your audio system. Our team devoted every effort to design and manufacture this highest-quality versatile and future-proof product and is proud to present it to you. We wish you hours of enjoyment from your music collection with the A1.5 Power Amplifier installed in your system.
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Page 5: Table Of Contents
4.1 Front panel controls..............................24 4.1.1 Front panel..............................24 4.1.2 Front face pushbuttons............................. 24 4.2 Operating modes..............................25 4.2.1 Normal mode..............................25 4.2.2 Shortcuts mode..............................27 4.2.3 Menu mode..............................29 4.3 Configuration................................32 4.3.1 A1.5 configuration menu items......................... 32 Rev 1.0 A1.5 User Manual... - Page 6 4.3.1.5 INSTALLED OPTIONS..........................36 4.3.1.6 NETWORK............................... 37 5 Firmware update................................38 5.1 Preparing the USB flash-drive........................... 38 5.2 Updating the unit's firmware............................ 38 5.3 Emergency firmware update procedure........................39 6 Troubleshooting................................40 7 Specifications..................................41 A1.5 User Manual Rev 1.0...
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Page 7: Product Highlights
Ethernet control capabilities and USB flash-drive firmware upgradability. Like all CH Precision products, the A1.5 is highly versatile: 5 configuration are available with the A1.5: stereo mode requiring a single A1.5 and monaural, bridge mode, active and passive bi-amplification modes requiring a pair of power amplifiers. -
Page 8: Unmatched Flexibility
1.1.1 Operation modes The A1.5 integrates two channels of amplification and can be fitted with a single or two input boards. When fitted with a single input board, two power amplifier units are required (one per channel) and the pair provides the following modes of operation: Bridge mode: In this mode, each A1.5 operates as a very high power mono amplifier and can deliver up to 550 Watts... -
Page 9: Feedback Control
Feedback and gain settings are replicated on both channels of amplification and the A1.5 can deliver up to 2x 150 Watts under 8 Ohms. It is the configuration used when a single A1.5 drives a pair of speakers. -
Page 10: Advanced Monitoring Circuit
1'700 VA toroidal transformer and ultra low ESR rectifying capacitors sitting in the central position of the unit. The area where the air flows to cool down the amplifier is hermetically sealed from the rest of the A1.5, ensuring the electronic circuitry is protected from gradually gathering dust. -
Page 11: Monaural Analog Inputs: Analog_In Board
1.4.2 Firmware update and control: CONTROL board The CONTROL board is factory fitted to each A1.5. It features a USB port for software updates (using the provided USB flash-drive) and an Ethernet port for remote-controlling the unit over a standard Ethernet network. -
Page 12: Before Use
Please store the packaging for future use. Check your A1.5 for any apparent damage. In case of a damage, immediately contact your authorized dealer. If your A1.5 is cold due to transport, please let it warm up to room temperature before powering it up. -
Page 13: Safety Notice
• Do not install your A1.5 power amplifier near water • Always handle the unit with care. The A1.5 power amplifier is very heavy, always have someone to help you when • moving it around Do not expose the unit to any kind of liquid •... -
Page 14: Transport And Packaging
Keep all the packaging material in a dry and clean place. Besides, we recommend to remove the adjustment spikes and to put them into the A1.5 box (four holes in the bottom piece of foam) for transportation. Vibrations during transport may cause the adjustment spikes to move from their fully retracted position and you run the risk of scratching your rack if the spikes are not fully retracted when installing the unit. -
Page 15: Installation
If no other CH Precision unit is to be stacked on top of the A1.5, screw the four top covers back. Otherwise, screw the four polymer stacking covers instead, and gently lay down the unit to be stacked on top of the A1.5. Be very careful that both units are perfectly aligned in order not to scratch the A1.5's top plate with the other unit's feet. -
Page 16: Connections
For details about how to integrate your A1.5(s) in a specific setup, please refer to the Amplifier modes section of this user manual. If you feel unsure with the connections to be applied to your specific configuration, please contact your authorized dealer for assistance. - Page 17 A1.5 rear panel connections (1) Argento Audio right negative speaker terminal (2) Argento Audio right positive (or bridge mono positive) speaker terminal (3) Ethernet RJ-45 port for command interface [CONTROL board] (4) USB port for software upgrades. [CONTROL board] (5) Analog ground connectors. The bottom one can be connected to digital ground (Earth) using the provided jumper (6) Earth connector.
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Page 18: Control Board
CONTROL board back panel layout The USB port on the CONTROL board is dedicated to the firmware update of the A1.5 unit. Do not use it for any other purpose. For more information on unit firmware update, please refer to the corresponding section of this manual. -
Page 19: Power Cord Receptacle And Voltage Selection
IEC C20 power cord receptacle and plug the power plug to an AC wall outlet only after all other connections were made. If third-party power cords are used, make sure that the socket mating with the A1.5 is fully inserted and not able to move and create intermittent contacts due to its own weight. -
Page 20: Bridge Mode
3.5.2 Bridge mode A pair of A1.5 amplifier, each equipped with a single analog input board can be used as a pair of high power monoblock amplifiers with high voltage swing. This configuration should be used when low efficiency high impedance loudspeakers are used in large rooms to achieve higher sound level than with a single stereo A1.5. -
Page 21: Monaural Mode
3.5.3 Monaural mode A pair of A1.5 amplifiers, each equipped with a single analog input board can be used as a pair of high power amplifiers with very high current capability. This configuration should be used when low efficiency low impedance loudspeakers are used in large rooms to achieve higher sound level than with a single stereo A1.5. -
Page 22: Passive Bi-Amplification Mode
3.5.4 Passive bi-amplification mode A pair of A1.5 amplifiers, each with a single analog input board installed, can be used in passive bi-amplification mode. In such a case, each amplifier board of each A1.5 feeds the speaker's drivers of a given frequency range. The main advantage of this configuration is the possibility to set a different global feedback for the different frequency bands. -
Page 23: Active Bi-Amplification Mode
3.5.5 Active bi-amplification mode A pair of A1.5 amplifiers, each with two analog input boards installed, can be used in active bi-amplification mode. In such a case, each output board of each A1.5 feeds the speaker's drivers of a given frequency range. This configuration is optimal when an active crossover network is used. -
Page 24: Daisy-Chain Mode
3.5.6 Daisy-chain mode When more than one A1.5 amplifiers are to be used to drive a single speaker, they can be daisy-chained. This allows for ultimate configuration taking both advantage of the increased power available for example in bridge mode, and the flexibility provided by multi-amplification (optimal feedback ratio setting for each frequency band). -
Page 25: Operation
Operation The A1.5 power amplifier is operated either from the unit's front panel pushbuttons and display or from the CH Control app available on Android tablets. The tablet reflects the state of the unit settings and allows the user to adjust the settings on the fly, directly from the optimal listening position. -
Page 26: Operating Modes
The A1.5 power amplifier has two main operating modes: Normal mode and Menu mode. Normal mode is mainly used to display general status (such as power or temperature) of the A1.5 whereas Menu mode is used to configure the unit. The A1.5 also includes Shortcuts for quick access to selected Menu mode items. - Page 27 (2) Mute indication. If the 7 symbol is present, the output is muted (3) Peak power fed to the load. Total power in bridge mode, maximum power (among the 2 channels of the A1.5) for other modes (4) Average temperature of the 2 output boards (in degrees Celsius).
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Page 28: Shortcuts Mode
4.2.2 Shortcuts mode The A1.5 amplifier is configured by a set of menus as described in the next sections. To allow quick access to the most frequently used settings, the A1.5 offers the concept of Shortcuts. Shortcuts are fully programmable and the user may choose almost any configuration parameter as a Shortcut. - Page 29 (6) Arrow indicating DOWN button [O] if applies. The item below indicates the previous parameter value (down direction) The last Shortcut (SETUP) is always the same and cannot be removed or altered. It gives access the Menu mode to access the detailed setup of the unit. DETAILED SETUP EXIT ENTER Rev 1.0 A1.5 User Manual...
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Page 30: Menu Mode
4.2.3 Menu mode The Menu mode allows for Configuration and Setup of the A1.5 power amplifier through a set of menus. Menu mode is entered from the last Shortcut item (see above). From 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 31 As an example, the following drawing shows the display elements of the A1.5 SETUP >> AUDIO SETTINGS sub-menu. A1.5 SETUP >> AUDIO SETTINGS menu display elements (1) Menu title. A1.5 SETUP >> AUDIO SETTINGS shows that the parent menu is A1.5 SETUP. By pushing the CANCEL [Q] button, the unit returns to the parent menu.
- Page 32 For instance if only a single ANALOG_IN board is installed or an amplifier mode requiring two input boards is selected, INPUT BOARD selection menu items (to select the left or right input board) will be hidden. A1.5 User Manual Rev 1.0...
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Page 33: Configuration
4.3.1 A1.5 configuration menu items 4.3.1.1 AUDIO SETTINGS The A1.5 SETUP >> AUDIO SETTINGS menu allows configuration of the audio related parameters of the unit. Accessible parameters are: - GLOBAL FEEDBACK: Sets the amount of global feedback for both channels... -
Page 34: Display Settings
Details of AUDIO SETTINGS menu parameters 4.3.1.2 DISPLAY SETTINGS The A1.5 SETUP >> DISPLAY SETTINGS menu allows configuration of the display related parameters of the unit. Accessible parameters are: - DISPLAY MODE: Selects what is displayed in normal mode... -
Page 35: Shortcuts
+/-30% unit's display color, even at low brightness. Details of DISPLAY SETTINGS menu parameters 4.3.1.3 SHORTCUTS The A1.5 SETUP >> SHORTCUTS menu allows configuration of the Shortcuts. Accessible parameters are: - SHORTCUT1: Defines action for Shortcut #1 - SHORTCUT2:... -
Page 36: Factory Settings
4.3.1.4 FACTORY SETTINGS The A1.5 SETUP >> FACTORY SETTINGS menu allows to get information about current A1.5 firmware version, to update the A1.5 firmware and to reset the unit to default configuration (or subset of settings). Accessible parameters are: - FIRMWARE VERSION:... -
Page 37: Installed Options
USB port RESET ALL SETTINGS Reset None Selecting 'Reset' returns the A1.5 to its factory settings. Serial number Serial number indicates the serial number of the A1.5. Format is SERIAL NUMBER None xxxx10nn. This parameter is read only. SHORTCUTS Default shortcuts None Selecting 'Default Mapping' returns the A1.5's Shortcuts to their... -
Page 38: Network
DHCP server feature. Manual Ethernet port WAKE-ON-LAN Connection to a If No is selected, the A1.5 can't be woken up by the app. Standby Only if PoE router via its RJ-45 mode will consume less than 0.5W. Ethernet port When Only if PoE is selected, the A1.5 can only be waken by the app if connected to a Power-over-Ethernet switch. -
Page 39: Firmware Update
5.1 Preparing the USB flash-drive 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 flash-drive (provided in the accessory box) with files containing the new firmware. -
Page 40: Emergency Firmware Update Procedure
FACTORY SETTINGS menu and select the FIRMWARE VERSION item. The displayed firmware revision should match the firmware revision on the files copied to the USB flash-drive. Note: The emergency firmware update procedure lasts 5-10 minutes, do NOT interrupt it! A1.5 User Manual Rev 1.0... -
Page 41: Troubleshooting
Check that the correct input is selected on your A1.5 amplifier Check that the correct amplifier mode is engaged No sound Your A1.5 is muted (display area 2 7 must be off). Unmute using the top button (“7” is displayed) Lost in the settings? -
Page 42: Specifications
USB port for firmware 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 A1.5 User Manual Rev 1.0... - Page 43 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. Rev 1.0 A1.5 User Manual...