Hall Research VSA-31-SP-W - Manual (Page 10)

Model VSA-31-SP
8
4.0 Operation
The user‟s operation of the system is almost self-explanatory. There are 7
buttons on the User Interface wall plate for powering the projector, video
source selection, volume and mute control as well as a user definable
AUX button.
The buttons are back-lit so you can tell which video or audio input is
selected. If the command string being transmitted to the projector has a
„wait‟ delay inserted, then during the prescribed wait time, the LED will
be blinking and the user cannot switch channels.
There is a volume knob on the User Interface with a corresponding LED
bar to indicate the current loudness setting. The Volume Select button is
used to specify whether you are adjusting the AV volume or the
Microphone volume.
The VSA-31-SP remembers the settings independently for each input. So
as you switch between inputs, the volume setting recalls the last setting of
that input. Later versions of the VSA-31-SP allow the user to control
which options are remembered, whether to process the user defined strings
at power-up and whether the microphone input is disabled or not.
The default setting is: Everything off, nothing muted and microphone
enabled.
Notes on Audio Output
The receiver has an “Audio Amplifier” switch with “Normal” and “Boost” settings. For
a small room use the “Normal” setting, for larger rooms use the “Boost” setting. This
is used to normalize the loudness LED bar display, so in a small room where you
never would set the sound volume too loud, with the “Normal” setting the LED bar
display is not all the way to the bottom all the time! Also note that if you use 4 Ohm
speakers, the power output from the system is maximized, so if you are using 8
Ohm speakers, and in “Boost” you still don’t have sufficient loudness, then you
better switch to a lower impedance speaker such as 6 or 4 Ohm.
You can add more than one speaker to each of the Left or Right output of the unit. If
you are using 8 or 16 Ohm speakers, you can parallel 2 of them on each channel
(for a total of 4 speakers). If you are using 4 Ohm speakers, then you need to put 2
of them in series for each channel (for a total of 4 speakers).
The VSA-31-SP receiver has a Line-level audio output. This connector is used in
cases where the built-in power amp may not be sufficient. Upon connecting a plug
to this jack, the power amp outputs are disabled and you can route a stereo cable to
any external Audio Amp of your choosing. The volume knob on the sender still acts
on the level of the line output signal.