Conclusion: I had one of these 5 channels in a Saturn Aura. It only took up a very small space in the trunk. It is super handy that all the wire connections are on the same side of the amplifier. It keeps the install cleaner. Because it is a full range class D it doesn't draw very much current compared to other 5 channels. It has a very clean sound and has plenty of power for anyone who isn't an SPL maniac.
Summary: The top of the line. 4-channel + Mono = 5-channel. It's a 5-channel amp that has plenty of power for whatever system you're trying to run and it's small enough to mount to the back of a single sub box or under your seat like I did. My PDX is powering four 6x9 type R door speakers and soon to add a single type R 12. This amp has had plenty of power for the last 3 months for my 6x9's and should keep me kicking hard after I add the 12.
Summary: Plenty of power in a small package. Supplies distortion free sound. I am running Infinity's 6.5, Polks 4.5 and a Polk 10 inch sub. The Polk sub seems to have taken more power from the amp then a previous MTX sub, but still sounds great.
Summary: I bought the Alpine PDX-5 to power Alpine Type R componets in all 4 doors and a subwoofer in my Ford Explorer. This amp is exactly what I was hoping it would be. Small and lite so it was easy to conceal under a seat in the second row. I've had it a few months now and it's been completely reliable. The system gets extremely loud and stays clear and the sub can rattle all the mirrors and windows.
Summary: I am using this AMP to run my entire system. This amp works great. It is compact but powerful. I was running a Fosgate amp before and I have to say the sound quality completely changed for the better when I went with this Alpine amp.
Summary: I have this Amp powering my whole system in my SUV. Sounds Awesome! Two 6x9's in the front, two 6.5" in the rear and a 10" JL Audio sub. The power certification that came with the amp stated a much higher power output. Just over 100 watts per channel x4 and 409 watts on the momo channel!