The Audison Prima AP5.9 bit amplifier has a built in digital signal processor (DSP) and allows you full control over your vehicle's sound system. The digital processor that is built into this amplifier allows you to plug a laptop into the amp, and you can tune each speaker independently with full equalization. This allows you to dial in each speaker individually so that you can have it play the frequencies it was designed for, at the level that sounds correct to you. The DSP flattens the input signal from the radio, removing any built-in equalization. Once the input signal is flat, you use the software to configure your front speakers, configure your rear speakers, and then tell the software the subwoofer setup you have, and configure it. Then, speaker by speaker, you can adjust the frequencies and the amplifier gain for each channel independently. This allows you to set your front dash speakers to play just the frequencies you want them to, at the level you want them at. Same thing with your rear speakers. Same thing with your subwoofer. You have full control. Think of a DSP as the soundboard at a concert. You are the sound man and you get to tune your stereo so that it sound exactly the way you want it to. When you go see good live musicians in small, intimate venues, the reason it sounds so good is because DSP's are involved.
Now let's get to the power aspect of this amplifier. The Audison AP5.9 bit amplifier is rated at 20Wx2 for the front channels or the tweeters, 50Wx2 for the rear or the speaker woofer at 4 ohms. At 2 ohms it is 40Wx2 and 90Wx2, respectively. For the woofer, at 4 ohms it puts out 150 watts of power, at 2 ohms, which is the most likely scenario, it puts out 270 watts of power. Now, if you are thinking to yourself, "But, my radio says that it is putting out 45 watts a channel for my front speakers," that isn't necessarily an apples to apples comparison. Because the the DSP, you can adjust the gain on the amp for those front speakers, +/- 6dB, which will allow them to play 4 times as lound. Also, if you are actively crossing them over, you are selecting the level at each frequency, allowing you to completely dial in those front speakers. 20 watts RMS from this amp will blow away 50-75 watts RMS from another without a DSP. For the rear speakers, the 50 watts RMS is more than enough for most speakers, and once again, you can adjust hte gain on each speaker independently. Finally, you will want either a single 2 ohm or dual 4 ohm voice coil subwoofer so that the amplifier will see a 2 ohm load and you will be ready for unbelievable sound quality in your vehicle.
If you are concerned about setting everything up, Audison offers a full tutorial on their YouTube channel and we can help guide you through it. We can show you settings that have worked for other vehicles so that you have a good benchmark as to where you start.