Expert: Cleggsan - 4/8/2010

Question
Hello can i use a unbalanced TRS cable to connect to the QSC GX3 in crossover mode since the input can only come in thought CH1?Also if the input level is say -10db what would the level be for each channel since they are sharing a unbalanced cable.

Answer
Yes. But maybe you misunderstand the crossover mode.  Here is the manual description of how this works for woofer bi-amping:

"A subwoofer reduces strain on the full-range speaker, allowing it to play louder, or letting a smaller speaker do the same job. The GX Series supports this mode with a Crossover switch that splits the full-range input entering Ch 1, sending 20 Hz - 100 Hz to the sub (Ch 1) and 100 Hz - 20 kHz to the top box (Ch 2). The front panel gain controls balance the sub and top box, while GuardRail optimizes peak power into the sub and top individually, for greater musical impact and dynamic range."

From:  http://www.qscaudio.com/products/amps/gx/gx.htm

So, you can use it in stereo mode to drive stereo speakers OR as a mono system with one amp driving the woofer and the other drive the upper audio ranges.  It is a form of bi-amping.  In this mode it is not stereo; but same signal to each amplifier.

You can use either XLR input connections or phone plug.  And you can purchase these cables with adapter on the other end for rca and other feed lines.

Direct input sensitivity is 1.2 volts.  So, as long as your feeding system can muster up that level you will be alright.  For example, all home grade audio output levels are always 1.0 volts or more - usually more.  The maximum input is 16v in order to avoid input overloads.

It is a great amp.