I've had two of the older red versions of this for about 8 years paired with a sony two channel 1200w amp, and it wasn't until recently that I realized just how capable these can be. I busted one because of junk rolling around in the back so I bridged the amp and hooked up just one. Only the one can still shake the car to the point where I need to back it off to hear anything else or see the mirrors, which made me realize that two is overkill. The sound quality is average, but for the price and considering how much power they can really handle these subs are amazing. Once I had it dialed in, I was amazed that just one could create the same sound that I had the two pushing out for 8 years (and by that I mean STUPID OBNOXIOUSLY LOUD lol). I planned on blowing the second one and replacing it, but at this rate I don't think even 500 rms will do the trick... Well done, Sony. Thanks for the hearing damage.
Pros: 8 years of abuse = excellent build quality Will handle more power than I can put up with Best bang for the buck
Cons: Average sound quality