Description of 46CXA3604:

The CXA360.4 Four-Channel Amplifier is built to power all your door speakers in a single, powerful package. Using Class A/B power, this amp features a variable bass boost with KickEQ, giving you as much as a 6dB of extra bump. A powerful 12dB crossover is also included, letting you quickly tune your system to perfection. CX-Series Amplifiers accept up to 40 volts (400 watts) of speaker-level input signal. This kind of flexibility both makes line-out converters unnecessary and optimizes your sound quality at the same time! Highly efficient heat sinks keep the amp cool with a sophisticated new look, while KICKER's FIT+ (Fail-safe Integration Technology-PLUS), gives you outstanding noise rejection - even with premium factory audio systems. This CX-Series Amplifier delivers as much as 90 watts into four full-range channels, or 180 watts into two bridged channels.

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.