For high power (over 100 watts) low frequency (below 80 Hz)I'm using the new Eminence HL10a. In the same box with 200 watts input it gives me an additional 7dB output at 40 Hz compared to a Beta 10, due to the elimination of power compression. I find that the Beta 10 works fine with up to 100 watts in, but beyond that the higher Bl of the HL10a allows much improved cone control, especially with high throat impedances. The high xMax of the HL10a also makes bottoming out a non-issue. However, with 100 watts or less input the Beta ten is more sensitive, so which to use is definetely a matter of intended usage. Since there's a $100 price differential it's an important consideration.