Rack Mounting; Application; Use The Hpa4 As A Headphone Amplifier - Alto HPA4 User Manual

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4.3 Rack M ounting
The most secure mounting is on a universal rack shelf available from various rack manufactures or your music
dealer. The HPA4 4-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 HPA4 4-Channel Headphone Amplifier on high
temperature devices such as power amplifiers etc. to avoid overheating.

5. APPLICATION

This section introduces some typical applications of your
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 HPA4 4-Channel Headphone Amplifier.

5.1 Use the HPA4 as a Headphone Amplifier

This is the basic application for HPA4 4-Channel Headphone Amplifier.
While using the HPA4 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
impedance 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 HPA4
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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LTO HPA4 4-Channel Headphone Amplifier. Please reserve
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