User manual MARTIN AUDIO MA5.2K DSP

[. . . ] MA5. 2K, MA5. 2K DSP User Guide The Martin Experience All material © 2010. Subject to change without notice. Contents Important safety instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Warning notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1 Installation and operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Read the instructions below carefully which will explain the many functions of the amplifier. All material © 2010 Martin Audio Ltd. Subject to change without notice 12 2. 2 The main screen The illustration below shows the main screen; this screen appears after a short presentation when the user powers on the amplifier. In the first line, after power on, "WAIT" appears; if the system parameters are normal, the display is replaced with "READY". During the normal operation the controller monitors the system parameters. If a parameter is out of range, the correspondent error code is shown on the LCD meter of the relevant channel on the third line; if the abnormal parameter is associated with both channels, the error code is written in the centre. The LED bars can function as output voltage or output current meters; in the first case the LCD meters function as output current meters, vice versa in the second case. The first green LED at the bottom of the LED bar when illuminated indicates the presence of input audio signal above -60 dBV on the corresponding channel. From the second green LED to the yellow one, each LED will illuminate for every 3 dB increase in level. If the level of the audio signal reaches the channel maximum output capability, the red LED will be triggered. The LED bars also have diagnostic function; a flashing yellow LED indicates a critical range of temperature (from 80°C to 85°C) of the power devices on the corresponding channel, if this LED is lighting constantly, the temperature is above 85°C. A constantly lit red LED indicates that the corresponding channel is in protection. The fourth line of the screen shows the functions of the buttons below; The "lock" function is activated if the corresponding button is pressed or more than 1 second; in this case all the other buttons are locked. The same operation unlocks these buttons (unlock code is required - see section 2. 3. 18 for more details). The "mute" buttons switch off the two channels independently; in this case "muted" appears on the first line. If the "menu" button is pressed, the main menu is displayed on the LCD screen. 2. 3 The main menu The illustration shows the main menu. You can scroll the menu items by pushing the up or down buttons and choose the selected function by pressing "ok" (if the chosen item enables or disables a function, display showing "on" is replaced with "off" for disabling it, or "on" for enabling it. See below for menu tree. Main menu All material © 2010 Martin Audio Ltd. Subject to change without notice 13 The Amplifier menu diagram 2. 3. 1 Output attenuation The illustration below shows the Output attenuation screen. You can choose to set CH1, CH2 or both by pushing the "C1+2" button. The "+" and "-" buttons change the value of the output attenuation in the range from 0 to -30dB. Note: for the best sonic performance it is recommended that you set the attenuation to 0db (no attenuation), and select the proper gain/sensitivity from the following menu. All material © 2010 Martin Audio Ltd. Subject to change without notice 14 2. 3. 2 Gain/Sensitivity The illustration below shows the Gain/Sensitivity screen. You can choose to set CH1, CH2 or both by pushing "C1+2" button. [. . . ] If the heat sink temperature reaches approximately 80°C, the yellow LED starts to flashing. If the temperature is more then 85°C the thermal sensing circuitry will mute each power section channels, the LED will light permanently and the power supply will be cut off. Once the heatsink has cooled down, the amplifier will automatically reset and the LED will go out. The temperature can be reduced by reducing the output power. 4. 4 DC fault protection If DC or excessive subsonic energy appears at a channel output, an instantaneous protection circuit will cut off the power supply for both channels. [. . . ]