Description of 46CXA6605:

CX-Series amps reach massive power levels thanks to an optimized circuit layout and the highest-grade internal components. Highly efficient heat sinks keep the amp cool and an optional remote level control lets you adjust bass on the fly. The CXA660.5 Amplifier is built to be the complete package in one cool-looking amp. This CX amplifier uses powerful Class A/B technology to power four mid/high-range channels and an ultra-efficient Class D power plant for the bass channel. The amp also comes equipped with FIT+ (Fail-safe Integration Technology-PLUS), giving you superior clarity and dependability. KickEQ variable bass boost gives you as much as a 6dB of extra bump with a simple turn of the knob. A powerful 12dB crossover and 24dB subsonic filter is also included, letting you quickly tune your entire system to taste. This CX amplifier delivers as much as 90 watts into four full-range channels or 180 watts

Description of RWK42:

The Rockville RWK42 4 AWG (American Wire Gauge) amp kit has the following diferences over other amp kits on the market at this price point. 1. Our RCA cables are 100 % copper. These are top of the line RCA cables 2. Better Resistance: The only thing that really matters with wires is the resistance rating. This is a measurement of conductivity and how much signal is loss per foot of wire. Since Rockville wires are made with around 3 times as much copper as any other wire at this price point, these wires had a much better resistance rating which means they will transfer more power to your amps than the other brands. 3. We do not cheat you on the thickness of the wire. These are standard American wire gauge thickness. This is another reason our conductivity is better than anything else at this price point. Other brands in the market place write 4 gauge, but cheat you on the thickness. We are honest about the thickness.