Reddit reviews Polk Audio PA D5000.5 900W RMS, 5-Channel Class D PA Series Car Amplifier (PAD5000.5),100 Watts x4; 400 Watts x1
We found 2 Reddit comments about Polk Audio PA D5000.5 900W RMS, 5-Channel Class D PA Series Car Amplifier (PAD5000.5),100 Watts x4; 400 Watts x1. Here are the top ones, ranked by their Reddit score.
Sophisticated unit will withstand numerous elements it encounters while on the waterStainless steel hardware throughout to prevent corrosion, short circuit protection and many other marine specific featuresHigh-speed MOSFET switching powerNickel-plated wire terminals and RCA connectors ensure maximum signal transferProtection: Thermal, DC offset, reverse DC voltage and short circuit protectionFit Type: Universal Fit
I have an extremely similar setup in my 1999 Ski Nautique, minus the tower. I would have loved help picking out equipment/installing, but didn't have any available, so had to learn as I went.
Head Unit - I basically got the older version of this. Make sure what you get has 6 pre-outs Head Unit $120
Amp - Go with a 5 channel amp to save space, I bought this one Polk 5 Channel $280
Speakers - 2 sets of these, which sound incredibly clear Polk 6.5 $250
Sub - I put together a sub from components. You will need sub, box, and grill. I'll link the sub I got but don't remember the box or grill. Went with 10 inch to save space, but it sounds great and is clear/sloud. Sub Around $120
Speaker Wire - Went with 14 guage, not sure what others would recommend here Wire $25
Amp Kit - Not sure what difference is between grades with these Kit $33
Basically, I had about the same budget, and it came to about $800-$900, I think prices have changed a bit since then.
I really went with clarity over loudness because I can't stand turning up the radio and hearing distortion, but this setup is both clear and very loud. I have gotten a lot of compliments on it.
To add tower speakers later you will probably need another amp, and maybe an alternator, not totally sure on that, if someone else has more advice.
Let me know if you have any questions, and hope this helps. Good luck!
Product links for more info:
https://www.amazon.com/Polk-Audio-5-Channel-Amplifier-PAD5000-5/dp/B005ZKFZEQ
http://www.jlaudio.com/8w7ae-3-car-audio-w7ae-subwoofer-drivers-92117