Both look like pretty solid subwoofers. Really havent ran the x yet to see how good it really can be but judging. I dont think the mx would be worth the 400 dollars(from a seller on here) seeing how I payed alot less for the elevation. to me most of these specs are just number but if you was to compare them which looks like the better some...im sure the x would be better for spl and mx better for sq.
Elevation Audio x12"
fs- 32 qes- 0.449 qms - 4.30 qts- 0.406 vas-34l xmax-32m effecieincy - 88.9db sd- .0539sqm re-2.6 ohm dvc 2 ohm rms power - 1500rms
Re audio mx 12"
Electrical Q Value -Qes: 0.503
Mechanical Q Value -Qms: 3.206
Total Speaker Q Value -Qts: 0.434
Free Air Resonance -Fs: 23.165 Hz
Equivalent Compliance -Vas: 59.0 liters
One-Way, Linear Excursion -Xmax: 22 mm
Efficiency - SPL 1W/1m: 83.5 dB SPL
Effective Piston Area -Sd: 480 cm^2
DC Resistance -Re: 1.4 ohm per coil
Nominal Impedance -Znom: Dual 2 ohm
Thermal Power Handling -Pe: 1500 W
Force Factor -Bl: 14.56