MK celebrates its 40th anniversary with three new THX-certified subs, all with dual drivers in a push-pull configuration that has the front-firing driver operating in phase and the bottom driver operating out of phase, as shown in the brochure we photographed on our hotel room bed. Each driver is in a separate chamber with electronics in a third one. Driver sizes are reflected in the models numbers: X12 ($3200), X10 ($2600), and X8 ($1900). Rated power is 400 watts RMS and 700 watts peak for the X12, 350-650 for the X10, and 300-600 for the X8. Shipping between February and April depending on model. Fans of the venerable MK 150 might want to given a listen to its new tweeter.