I agree. I replaced my Summits with the Expression 13A's. However, aside from the addition of ARC, they're still far from equivalent. The 13A's have 13" wide panels, vs. the Summit's 11". Both have dual 10" woofers, but totally different configurations. Also, the Expressions cross over from panel to woofers at 300 Hz, vs. the Summits/X at 270 Hz.I agree with GW1800, the 13 is the current similar model, but it is much better with the built-in ARC room correction for the bass.