Yes there is more throw.
The Z v.4 series is our 1750 RMS rated line they feature a 3 diameter 8-layer flat aluminum coil wound on spiral cut black anodized aluminum former. They feature our new spider, surround, and cone platform. Production linear x-max is around ~35mm one-way by 70% BL with a total mechanical clearance of 62.5mm in the motor. The Z v.4 series features a large internal magnet shorting ring for reduced inductive distortion.
The X series is our 1250 RMS rated line -- they feature a 3" diameter CCAW round wire coil and our new frame, spider, surround, and cone platform. Linear x-max is around ~30mm one-way by 70% BL with a total mechanical clearance of 50mm in the motor.