from my own experience, which is very limited, i rather spend more on one excellent sub than more money on two not so good. I had 2 JLAudio 10's, and they were leagues below the Lambda Acoustics.
I also heard some Audiobahn's at my installers store, and they dont compare either. Even my box is crappy compared to my original JLAudio box, so the quality of the sub is that good, that it can outshine them with a so so box.
