Phoenix Audio Technologies
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www.phnxaudio.com
7. VCA Interface - Connection and Operation
The VCA interface is an Analog In / Analog out interface. It can be utilized to
connect the Quattro to a Video Set-top Codec or a computer’s sound card.
The black RCA jack on the right should be connected to your VC system’s (or sound card’s) output (the signal
that goes to the loudspeakers. The red RCA jack on the left is the Quattro’s output and it should be connected
to your VC system’s (or sound card’s) Input.
The VCA interface has a sensitivity control switch which offers 8 different settings of output signal level. This
allows the user to tune the Quattro’s output level and optimize it to the specific VC (or sound card) input level
specifications. The output levels for the different switch settings are detailed in the following table (note: the
orientation of the switches in the diagram represents the way these switches appear when the Quattro is sitting
on the table):
Switch
Position
Output
level
peak-to-peak
Switch
Position
Output
level
peak-to-peak
Line
level
3.0v
Mic
level
0.5v
Line
level
1.5v
Mic
level
0.25v
Line
level
0.75v
Mic
level
0.125v
Line
level
0.375v
Mic
level
0.0675v
