I’ve had Planar speakers since the early eighties and still have a pair of Acoustat Model X’s. The midrange and the High-end are fabulous! The low-end, while accurate, has no push to it. If I play the beginning of DSOTM loud, the heart beat goes rattle rattle, rattle rattle, because it can’t produce the umph of a traditional speaker. I’ve made a bunch of subwoofers over the years and have an old Audio Research EC-2 crossover, but have never got it quite right. The ripple of the Mylar is so much faster than a moving cone!
All the best!
JD