depends oh the vehicle and the true power of the ma audio amp but i heard one at a comp in a truck on two us amp 2000 rms monsters and it only did a 148 db burp which i thought stank but it was probably the install
Digital Design subs are plain out wicked for SPL, a 9500 or 9900 is more than capable of smacking the Solo X all over the place. Honestly, IMO the Solo X is just a power eater, better can be had for SPL, and with less current draw. It just depends on your budget.