User manual ALTO HPA6

[. . . ] User's Manual HPA6 6-Channel HEADPHONE AMPLIFIER LTO www. altoproaudio. com Version 1. 0 April 2002 R English SAFETY RELATED SYMBOLS CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN wire or disconnect the wiring of protective grounding terminal. Operating Conditions This apparatus shall not be exposed to dripping or splashing and that no objects filled with liquids, such as vases, shall be placed on this apparatus. To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture. Install in accordance with the manufacturer's instructions. [. . . ] While using the Direct In Input, the Main signal applied on the rear panel is interrupted automatically. 2. Input Gain Control: This control sets the input signal level coming from Main/Direct In. 3. Input Level Meter: This 8-digit Input Level Meter informs you about the input signal level within a range from -24dBu to +18dBu. 4. Aux In Input: The Aux In Input is used to feed the further input signal, which can be mixed with the Main/ Direct In signal via Balanced Control. 5. L Mute Switch: This push-button mutes the Left input signal. 6. R Mute Switch: This push-button mutes the Right input signal. 7. Mode Switch: This push-button switches the operational mode between Mono and Stereo. Press this button for Mono application, and the Mono LED (8) lights up. 8. Mono LED: This LED informs you the current operational mode. Press the Mode Switch(7) for Mono application, this LED lights up. 9. Headphone Out Output: This 1/4" TRS phone jack is connected in parallel to the rear panel output connectors, and provides an additional option to monitor the individual channels. When this unit is permanently installed in rack, this proves to be a useful function. 10. Balanced Control: This control sets the proportion between the Main/Direct In signal and the input signal applied to Aux In Input. 11. Output Gain Control: This control sets the volume of the individual channels and refers to both the Left & Right Channel and the Headphone Out. Do not plug power cable into AC power until voltage has been correctly set. 15. Main Input Connectors: These connectors are used to input the stereo signal. You can input the main signal via the balanced 1/4" TRS phone jack or XLR connector. 16. Main Output Connectors: These connectors are used to output the stereo signal. You can output the main signal via the balanced 1/4" TRS phone jack or XLR connector. In some typical field, you can also use these connectors to interlink several Headphone Amplifiers. 17. Headphone Out1: In Parallel with the Headphone Out on the front panel (for Channel 1), these are the headphone outputs of Channel 1. 18. Headphone Out2: In Parallel with the Headphone Out on the front panel (for Channel 2), these are the headphone outputs of Channel 2. 19. Headphone Out3: In Parallel with the Headphone Out on the front panel (for Channel 3), these are the headphone outputs of Channel 3. [. . . ] The Balanced Control supersedes the previously required monitor mixer and allows for an application that is frequently used in Studio field. Typical example : Suppose a vocalist wants to record a vocal track that is to be added to already existing instrumental tracks. Up to mow, it has been common practice that the vocalist listens to the playback by pressing a headphone pad against one ear, while controlling his/her own voice with the another free ear. 9 This kind of application may be obsolete if you come with the LTO HPA6 6-Channel Headphone Amplifier. Insert the playback signal via the Main Inputs, and apply the preamplifiered vocal signal to Aux In. The Balanced Control is adjusted so that the vocalist can hear a pretty perfect mix of both backing tracks and vocals, with the Output Gain Control to determine the overall volume level. P layback P rogram Out1 M ain I nput INPUT LEVEL(dBu) 24 18 12 6 0 6 12 18 OUTPUT LEVEL(dBu) 24 0 12 CLIP 3 2 4 OUTPUT LEVEL(dBu) 24 0 12 CLIP 3 2 4 OUTPUT LEVEL(dBu) 24 0 12 CLIP 3 2 4 OUTPUT LEVEL(dBu) 24 0 12 CLIP 3 2 4 OUTPUT LEVEL(dBu) 24 0 12 CLIP 3 2 4 OUTPUT LEVEL(dBu) 24 0 12 CLIP 3 2 4 3 2 R L 4 MUTE R MAIN IN AUX BALANCED 1 6 0 OUTPUT GAIN HEADPHONE OUT 5 L MUTE R 1 MAIN IN AUX BALANCED AUX IN 6 0 OUTPUT GAIN HEADPHONE OUT 5 L MUTE R 1 AUX MAIN IN BALANCED AUX IN 6 0 OUTPUT GAIN HEADPHONE OUT 5 L MUTE R 1 AUX BALANCED AUX IN 6 0 OUTPUT GAIN HEADPHONE OUT 5 L MUTE R 1 AUX BALANCED AUX IN 6 0 OUTPUT GAIN HEADPHONE OUT 5 L MUTE R 1 AUX BALANCED AUX IN 6 0 OUTPUT GAIN HEADPHONE OUT 5 LTO DIRECT IN AUX IN 1 0 6 5 MONO ON HEADPHONE 6-Channel HPA6 MONO MONO MONO MONO MONO AMPLIFIER STEREO STEREO STEREO STEREO STEREO STEREO INPUT GAIN MAIN SECTION CHANNEL 1 CHANNEL 2 CHANNEL 3 CHANNEL 4 CHANNEL 5 CHANNEL 6 OFF POWER AUX In 1 Line Out Mic In M ixing C onsole Microphone 5. 4 The HPA6 in Mono / Stereo Application The HPA6 6-Channel Headphone Amplifier can be switched between the Mono and Stereo operational mode via Mode Switch control. [. . . ]