I wanted to like this amp....
....I really did. It had such great reviews, 90%+ 5 star, and I like the alpine brnd. But I've been really unimpressed with the system we put into my teenagers 2003 maxima. It has just never sounded that good, and I couldn't figure out why. Nice alpine HU, strong pre-out voltage, lots of audio adjustments, alpine mono amp and 4ch amp, both from the same lineline, very well reviewed, good wiring, decent if inexpensive speakers, 6.5" certain Vega comp set in front, mtx 6.5" coaxial in back, 12" JL lower end Sub in a correct ported box. Simple but should be effective system. But no, it sounded thin and weak, no bass even with the gain, the bass boost, the sub setting, the bass setting all turned up. It was the same in a previous altima on a JVC HU. So just on a whim, I switched the MRP500 for a Rockford fosgate prime 300w sub amp. About the same price as the alpine, maybe cheaper, had it sitting around after an other aborted project. It is literally night and day different. Had to put all the settings back to normal range, and the JL is performing as I would have expected. I tried everything with the alpine, the phase, the filters, you name it. It was just weak. The RF kicks butt immediately. Now I'm looking to switch out the 4ch alpine for a RF Prime to make up the whole system. I can't understand all the 5 star reviews for the alpine, it just doesn't do the job. I gave it 2 stars for ease of installation, and no apparent alternator whine.
Pros: Easy to install, compact, no interference noise
Cons: Virtually no amplification. Rendered 12" JL sub almost useless. Similarly priced Rockford Fosgate Prime is at least 5x as good.