Hall Research VSA-31 - Manual (Page 8)

Model VSA-31
8
4.0 Operation
The user’s operation of the system is almost self-explanatory. There are 4
buttons on the wall plate for powering the projector and selecting one of
the 3 A/V inputs.
The buttons are back-lit so you can tell which input is selected or if the
projector is turned on or not. 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 sender with a corresponding LED bar to
indicate the current loudness setting.
The VSA-31 remembers the settings independently for each input. So as
you switch between inputs, the volume setting recalls the last setting of
that input.
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 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.