User manual AKG HPA 4000

[. . . ] Please note that the equipment will not be fully isolated from power when you set the power switch to OFF. Do not place the equipment near heat sources such as radiators, heating ducts, or amplifiers, etc. And do not expose it to direct sunlight, excessive dust, moisture, rain, mechanical vibrations, or shock. To avoid hum or interference, route all audio lines, particularly those connected to the microphone inputs, away from power lines of any type. [. . . ] Please keep the Manual for future reference. The HPA 4000 is a headphone amplifier with eight stereo line inputs and one stereo output. It allows you to monitor the output signal of any one of eight SR 4000 receivers on headphones. aKG offers suitable headphones for every application. You can use the HPA 4000 as a standalone unit or install it in a 19" rack using the supplied Rack Mounting Kit. 1 HPA 4000 headphone 1 in-line power supply amplifier (if checked on the packaging) Should anything be missing, please contact your AKG dealer. SOURCE 1-8: These blue LEDs indicate either the selected input channel of the current volume level. Each short push selects the next higher input channel number. Turn all the way CW or CCW and release to increase or decrease the volume by one increment. the SOURCE LEDs will indicate the change in volume level. After three seconds, only the SOURCE LED for the selected channel will remain lit. 2 Rear Panel You can set the volume in more than 8 increments. The next (previous) LED may therefore not be lit (extinguish) before you have notched up (down) the volume by several increments. Operate the equipment with the included power supply with an output voltage of 12 VDC only. Using adapters with an AC output and/or a different output voltage may cause serious damage to the unit. Prior to setting up the unit, check that the AC mains voltage stated on the included power supply is identical to the AC mains voltage available where you will use your system. Using the power supply with a different AC voltage may cause damage to the unit. Make all audio connections before connecting the unit to power. [. . . ] The volume level will automatically change to a factory preset minimum. To revert to the previous volume setting, turn the setup control all the way CW. The current settings will be stored in the EPROM and automatically loaded the next time you power up. Switch power to the unit off and disconnect the power supply from the power outlet. [. . . ]