A class A/B amplifier uses two groups of transistors and it is generally considered to be the best compromise of the two classes put together. Class ‘A’ and class ‘B’.A pure class ‘A’ amplifier typically has an enormous amount of current flowing through its output transistors with no audio signal.A pure class ‘B’ amplifier has NO current flowing through its outputs with no audio signal. This eliminates virtually all of the crossover distortion that’s possible with class ‘B’ amplifiers.A class A/B amplifier is much more efficient than a class ‘A’ but without the possible distortion of a class ‘B’.As if that wasn’t enough, with a Full Range amplifier you not only have the option to run your speakers, but also your subwoofers.By just a flip of a switch from Full to Low, the CXX1204 will change from offering a complete range of frequencies that you need to be able to listen to your 2/3/4 or 5 way speakers to the “Low” that you need for a subwoofer application.

This feature comes in handy for a few different installation applications and is very multi versatile. Let’s go down the list.The “4” channel means that you are able to simply use the CXX1204 as a 4 channel amplifier by hooking up 4 speakers to it. Fronts and rears.The “3” channel is slightly different.What you can do here is to hook up 2 speakers to channels 1+2 and use the remaining 3+4 channels for 1 subwoofer in bridged mode.And lastly, the functionality of the “2” channel.Channels 1+2 can be bridged to accommodate one speaker OR one subwoofer.Channels 3+4 can be used in the exact same above application.

The CXX series amplifiers have two different ways that you can get a signal into it.One is called Low level input and the other is called High level input.A low level input is measured in voltages. It comes in the form of RCA outputs from the back of your receiver and goes to the RCA inputs on your amplifier.A high level input is measure in wattages. It comes in the form one positive and one negative wire from the back of your receiver to and goes to the input terminal of your amplifier in the same wire form.Low-level (RCA) input wiring is preferred for best audio performance. Always use a high-quality RCA cable for best audio performance.NOTE: Do not connect BOTH the high level and low level inputs from your receiver to your amplifier at the same time!