Nilfisk-ALTO user manual Application, Use the HPA6 as a Headphone Amplifier

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4.3Rack Mounting

The most secure mounting is on a universal rack shelf available from various rack manufactures or your music dealer. The HPA6 6-Channel Headphone Amplifier fits into one standard 19" rack unit of space. Please allow at least an additional 4" depth for the connectors on the rear panel. Be sure that there is enough air space around the unit for sufficient ventilation and please do not place the HPA6 6-Channel Headphone Amplifier on high tem- perature devices such as power amplifiers etc. to avoid overheating.

5.APPLICATION

This section introduces some typical applications of your LTO HPA6 6-Channel Headphone Amplifier. Please reserve your time to well understand the control elements ( see Chapter 3 ) and the following application examples, so as to be able to fully exploit the HPA6 6-Channel Headphone Amplifier.

5.1Use the HPA6 as a Headphone Amplifier

This is the basic application for HPA6 6-Channel Headphone Amplifier.

While using the HPA6 as a Headphone Amplifier, please apply the program source to Main / Direct In Inputs, and connect the headphone cable to one of the appropriate outputs. Ensure the Balanced Control adjusted to the complete counter-clockwise position, and turn up the Input Gain control. The Input Gain control is used to boost or attenuate the general volume of all the headphones, while the individual Output Gain controls are used to set the desired channel volume.

Three headphones can be connected per channel each time, but, please be sure that the resulted connection impe- dance must over 100ohms, otherwise, the output amplified signal may sound a little offensive, in terms of long time fault condition usage, the headphone amplifiers will be finally damaged or distorted.

If you still need further headphone ports or more groups headphone amplifier, please interlink any number of HPA6 via the Main outputs.

In parallel with the Headphone Output on the rear panel, the Headphone Output on the front panel is also used to output the signal of the individual channel, such function proves to be very useful esp. in the rack mounting application.

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