All subs have some form of equalizer, yes. The only way to sort out the relative performance is to listen to them. And just because some are popular doesn't necessarily make them better than others. The SVS PB12 (I think that's the name) that Jason brought over is a popular sub at a popular price and although it's great for movies, I got sick of the thumping when it came to music. The 350 in my opinion is a better sub.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated