just bought a 12" Pioneer sub but need help
 

I just bought a 12" Pioneer sub TS-W309D2 from Best Buy on sale for $40 thinking it was a good deal (was it? lol). it's a 400w rms 2ohms sub and I'm having a hard time deciding which amp to get. I understand adding just a sub, I should get a mono amp and from my noobish research, I've come up with two amps to choose from: the Kenwood KAC-8105D and the Alpine MRP-M500. both amps are similar in specs and I don't know which to choose or which one is better. are these even the right amps for me? are there any other amps I should be looking at? I'm just looking for a reasonably priced amp to properly handle the Pioneer. This will be connecting to my '12 Accord SE stock radio. any help would be appreciated, thanks :)

Links to specs:

Pioneer Specs

Kenwood Specs

Alpine Specs

do you have to buy it from Best Buy? Can your order one?

You bought a Dual 2 ohm sub. So you need to power it at 1 ohm or 4 ohms. You cannot achieve 2 ohm mono. The amps you listed are not what you want.

The Phoenix Gold S1000.1 includes high-level inputs and auto turn-on so you don't need to do any wiring behind the head unit or generate a remote turn-on. I recommend this over the two you listed. Phoenix Gold is making a nice come-back. This amp is larger than you need, so you have some future flexibility and headroom so you won't worry about clipping.
S1000.1 - 1000 Watt Mono-Block Amplifier - Phoenix Gold

There are other 1 ohm stable amps you could look at. Or you could get a higher power 2 channel and bridge it. But you want to keep high-level inputs and auto turn-on or you'll need to buy a LOC to achieve that. If you want a LOC and use any 'ol amp, i recommend this one: Navone Engineering N-RHL-2
N-RHL2 - BEST LOC IN THE WORLD!! - $24.95 : Zen Cart!, The Art of E-commerce

same response as the other forum.

welcome to HAF!

Im a big fan of the Alpine V Power line. Theyre entry level but still very well made and will make their rated power. Ive owned a few of them and theyve all been dead silent in terms of noise and worked great. That would be the one Id vote for.

there are other brands that would perform even better in case ur open to suggestions.

ARC audio
Orion HCCA amps
US amps/RE audio

personally i like the RE audio XTX-5000.1 and Orion HCCA 25001