Hey newc33, among other shortcuts the LV12r is using a much lower end driver than the FV15HP (which is using the much more massive DS1510). The FV15HP will (probably) have a greater grip on the cone and therefore tighter sound quality. Two FV15HPs could give you around 9 or 10 dB of output over the LV12. The only way you are going to get a meaningful contribution in output from the LV12 over that kind of power is if you place it very close to you. The problem is, if it IS making a meaningful contribution to the output, its lower quality bass will be more prominent in the overall sound, thereby diminishing the overall sound quality. On the other hand, if it is trying to run on an equal footing with the FV15HPs, its clean output won't be heard at all, but it will hit its performance ceiling far sooner than the FV15HPs at which point it will rapidly drive up distortion in the overall bass sound. Anyway you run it, it is going to be a bottleneck.