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A1.5 Two-channel Power Amplifier

User Manual

Содержание A1.5

Страница 1: ...A1 5 Two channel Power Amplifier User Manual...

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Страница 3: ...al journey we kindly request your special attention regarding the information contained in this manual The A1 5 as you will discover in the following pages is a Swiss precision product designed for ul...

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Страница 5: ...2 4 Transport and packaging 14 2 5 Cleaning your unit 14 2 6 Maintenance and service 14 3 Installation 15 3 1 Unpacking 15 3 2 Unit positioning 15 3 3 Connections 16 3 3 1 CONTROL board 18 3 3 2 ANAL...

Страница 6: ...1 4 FACTORY SETTINGS 35 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 pro...

Страница 7: ...s For increased flexibility the A1 5 also provides two unique features the global versus local feedback ratio and gain adjustments The amount of global feedback in the amplifying loop of each channel...

Страница 8: ...ier s front panel or from the CH Control app running on a tablet In addition multiple CH amplifiers can be daisy chained for ultimate performance in multi amplification systems 1 1 1 Operation modes T...

Страница 9: ...distortion figures Local feedback on the other hand does not include the output stage and lets the latter operate in open loop mode This favors small signal details and timing As a rule of thumb a hig...

Страница 10: ...al surface treatments provide the luxury finish of the A1 5 Four steel feet support the unit Each foot ends with a elastomer ring to sit on delicate surfaces but is also equipped with a height adjusta...

Страница 11: ...mer A second toroidal transformer is used as standby transformer to ensure green standby mode meeting the latest energy saving regulations Both transformers have static shields between primary and sec...

Страница 12: ...e should contain Your A1 5 power amplifier with one or two input boards depending on what you ordered An IEC C19 power cord Four adjustment steel spikes A suction cup used to unscrew the top covers An...

Страница 13: ...e bottom of the unit Do not operate under high ambient temperature 40 C or with extremely high humidity Only use options and accessories specified or recommended by CH Precision Do not open the unit n...

Страница 14: ...ully retracted when installing the unit 2 5 Cleaning your unit Use a soft dry towel or cloth for cleaning Never use any solvent or liquids as they may damage the surface treatment or penetrate inside...

Страница 15: ...on for instance in your preferred audio rack Make sure cool air is able to freely flow around the unit 2 Gently lift the unit s corners and insert a support disc under each foot The foot s elastomer r...

Страница 16: ...ovides information about how to connect the A1 5 power amplifier to your system As the A1 5 is a modular design with different optional boards the description applies to the example configuration pres...

Страница 17: ...nced analog output pass through for amplifier chaining for right channel Right ANALOG_IN board 10 XLR balanced analog input for right channel Right ANALOG_IN board 11 XLR balanced analog input for lef...

Страница 18: ...Fi network of the router Install the CH Control app on the Android tablet freely available from the Google Play Store Once installed run the app The app gives you access to all the settings of the A1...

Страница 19: ...he socket mating with the A1 5 is fully inserted and not able to move and create intermittent contacts due to its own weight 3 5 Amplifier modes This section describes the most standard setups in whic...

Страница 20: ...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 This configur...

Страница 21: ...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 s...

Страница 22: ...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...

Страница 23: ...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 Optimal global feedback can be set f...

Страница 24: ...ng 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 The picture bel...

Страница 25: ...user control pushbuttons 3 Display area high definition AMOLED display The standby LED lights up when the unit is in standby It is normally turned off during operation The LED can also be programmed...

Страница 26: ...igure the unit The A1 5 also includes Shortcuts for quick access to selected Menu mode items Shortcuts are user programmable and most Menu mode items can be added to the list of Shortcuts 4 2 1 Normal...

Страница 27: ...s depend on the installed optional boards and user settings In the example above the A1 5 is set as a single channel bi amplifying power amplifier using its balanced XLR input connectors with its outp...

Страница 28: ...an OK R push will return to Normal Mode and an UP N push will enter the Menu mode The individual parameter for a given Shortcut is modified using UP N or DOWN O buttons If there is no user action for...

Страница 29: ...direction 3 Next parameter Value if UP button N is pushed parameter up 4 Current parameter Value 5 Next parameter Value if DOWN button O is pushed parameter down 6 Arrow indicating DOWN button O if ap...

Страница 30: ...m DETAILED SETUP and push the TOP N button once to enter the Menu mode If no shortcut is configured simply press the OK R button once to enter the Menu mode Navigation in Menu mode is based on UP N an...

Страница 31: ...he 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 3 This is the parameter...

Страница 32: ...ble parameter Value s depends on parameter 4 parameter for which the parameter Value can be modified in the current menu screen The following section provides detailed information about the menu struc...

Страница 33: ...rameters of the unit Accessible parameters are GLOBAL FEEDBACK GLOBAL FEEDBACK 1 GLOBAL FEEDBACK 2 INPUT AMPLIFIER MODE GAIN GAIN 1 GAIN 2 INPUT BOARD Sets the amount of global feedback for both chann...

Страница 34: ...unit Accessible parameters are DISPLAY MODE FRONT LED BRIGHTNESS NORMAL BRIGHTNESS DIMMED COLOR GAMMA SCALE Selects what is displayed in normal mode Selects if the front LED is turned on Sets the nor...

Страница 35: ...splay 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...

Страница 36: ...e AUDIO SETTINGS and DISPLAY SETTINGS menus or None None If SHORTCUT 6 is not defined parameter value for SHORTCUT 6 is set to None Details of SHORTCUTS menu parameters 4 3 1 4 FACTORY SETTINGS The A1...

Страница 37: ...muting or powering down the amplifier In such extreme cases and if it is of major importance that the A1 5 runs uninterrupted protections can be temporary disabled by the end user at his own risk NETW...

Страница 38: ...offline or connect to it as being the master or as a slave This networking facility allows information sharing among CH products ROOM NUMBER 1 7 Connection to a router via its RJ 45 Ethernet port Defi...

Страница 39: ...d that only one revision of these files is present Any missing file will make the firmware update procedure fail while multiple versions of the same unit s firmware can lead to unstable A1 5 behavior...

Страница 40: ...n 5 1 2 Power the unit off back panel mains power switch to OFF 3 Push and keep the standby mute button pushed while powering up the unit back panel mains power switch to ON Keep the standby mute butt...

Страница 41: ...gs and start your setup again Software update fails Try the Emergency Software Update procedure If it fails download the latest A1 5 firmware from www ch precision com prepare a software update image...

Страница 42: ...ratio of the amplification stage Gain 24 dB range adjustable gain in 0 5 dB steps Analog Audio outputs Speaker terminals 2 pairs of custom Argento Audio binding posts THD Noise Less than 0 01 1kHz sig...

Страница 43: ...ing the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures adjust or relocate the receiving antenna increase the separation between...

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