The Sundown Audio X v.3 has a bigger motor and graduates to the Zv5 coil.
So also more linear Xmax. Which Means More output and less distortion and more power handling vs.
the Sundown Audio X v.2 -- the X v.3 is like 85% of a Z v5 .
with these upgrades; Sundown Audio has added 500 more watts to the power handling making it one of the most potent subwoofers in the world, that also sounds good.
✓ Power (RMS)
✓ Voice coil
|T/S SPECS||X V.3 18″ D1||X V.3 18″ D2|
|Sens (dB @ 1w/1m)||88.6dB||87.6dB|