Infinity REF-551A Reference Mono, 550w X 1 Amplifier

This amp is a great overall sub amp. The power is underrated and the sound quality is top notch. Power is probably closer to 800 watts. Pairs perfectly with 2 10” Infinity Kappa subs. I will continue to recommend Infinity Reference series amps.

Rated at 550 watts RMS at 2 ohms. Delivers right at 820 watts at 2 ohms. Don't take my word for it - go to the site everyone goes to for videos on just about anything and enter the model number coupled with the word "dyno" and see it for yourself. No subsonic filter or wired remote are the only downsides to this amp, but both of those potential issues can be remedied with a head unit that possesses those features. The amp has a terminal for a remote turn on wire, but it also has auto signal detection - which is not advertised or listed as a feature by the manufacturer - which negates the need for a remote turn on wire if you don't already have one in place. Quite possibly the best bang for your buck on the planet when it comes to car audio amplifiers.

It's great for the money but not powerful enough to push 2 12inch subs. The sound and quality is very nice.

Nice clean amplifier good for one subwoofer not enough power to run 2 12 inch subs good for small bass wallet for personal use

This company does not produce poopy items! Everything in my rig is all infinity! This amp pushes a single infinity ref… 10” sub and wants me to keep turning up the gain. Power is solid, nice weight to the amp, and sound quality is outstanding. I love Harmen

Mine only lasted a month...

The media could not be loaded. Hooked this up to a single sub to make up for the lack of bass in a factory Kia K5 radio. Gave it the perfect amount of kick I was looking for.

Don’t expect it to bang you like 2020 did, but more of a 2022. It’s being used on 2 10” shallow mount subs and it sounds great!