8
GAIN STRUCTURE FOR LINE INPUT SOURCES
Once the external devices have been wired to the Vortex Device, the Input and/or Output gain of
the Vortex Device needs to be set to match the nominal level of the external devices. Here is a
table that references the types of connectors to the proper input / output level of a Vortex Device:
Table 2. Recommended input and output gain settings based on connection type
Connector Type Input Gain Output Gain
RCA +10 dB -10 dB
1/8 inch +10 dB -10 dB
XLR 0 dB 0 dB
Phoenix / Terminal Block 0 dB 0 dB
The issue of nominal levels will affect the gain structure of the Vortex Device. Devices that have
RCA and 1/8 inch style connectors are normally designed to operate with a nominal level of .3
Vrms. The Vortex Device is designed to operate with a nominal input and output level of .775
Vrms. This equates to a difference of 8.24 dB between the two nominal levels. For simplicity, you
may round that value to 10 dB. Therefore, the inputs of the Vortex that receive consumer level
outputs need to be set to +10 dB in order to achieve a unity gain. The outputs of the Vortex will be
about 10 dB too high for the consumer level equipment and, in turn, need to be set to -10 dB to
avoid clipping and to maintain enough headroom in the consumer level devices.
The Input gain of a Vortex device that is connected to a SoundStation VTX 1000 should be set to
+10 dB. The Output gain of a Vortex device that is connected to a SoundStation VTX 1000 should
be set to -10 dB. The Input and Output gains of a Vortex Device that is connected to a VSX 8000
and any other balanced devices should be set to 0 dB.
TESTING THE AUDIO INPUTS AND OUTPUTS
1. Go to SYSTEM, DIAGNOSTICS, AUDIO, AUDIO METER and then speak into one of the
microphones. Your level should be around 0 dB on the B
ALANCED IN meter. You may also
use the loop-back feature to listen to your own audio in the local room. That feature is
under S
YSTEM, DIAGNOSTICS, NETWORK, NEAR END LOOP.
2. Go to S
YSTEM, DIAGNOSTICS, AUDIO, SPEAKER TEST to listen to a codec-generated 400 Hz tone.
CONTROLLING A VORTEX DEVICE VIA THE VSX 8000
When connected via an RS-232 cable to the VSX 8000, a Vortex Device can be controlled via the
Mute button of the Remote Control of the VSX 8000. When the Mute button is pushed to mute the
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