New Spatial Audio M4 Ultra

@soix: By the way, the woofer towers of the GT Audio system are made using the Rythmik Audio/GR Research OB/Dipole Subwoofer kit. The kit includes a pair of 12" servo-feedback woofers and the Rythmik A370 plate amp, which includes a dipole cancellation compensation network. Best sub in the world! GT uses multiple kits per side, stacking several OB/Dipole H-frames into tall columns.

Another fan of Spatial Audio and Clayton Shaw is Danny Richie of GR Research. In a recent YouTube video Danny raved about the X4 (I believe it was), recommending it to his customers who can't or don't want to build a GR Research DIY kit. He of course recommended adding a pair of GRR/Rythmik Audio OB/Dipole subs to the Spatials ;-) .