VMPS does not license from ET. Sonigistix, the OEM for the panels used now by VMPS was a lisencee of Eminent Tech. When Sonigistix closed shop VMPS bought these planar drivers in large quantities.
Speaking from personal experience ET's are some of the fastest speakers around, with exceedingly low distortion figures (for the LFT VI <.04% HD, 100 Hz - 20KHz, 90 db, 1 meter) as well as some of the select few that can pass a square wave (read they 're transient perfect). And yes they can sound a bit thin at the low end depending on system and set up of course, but nothing that a good sealed sub can't fix.
Speaking from personal experience ET's are some of the fastest speakers around, with exceedingly low distortion figures (for the LFT VI <.04% HD, 100 Hz - 20KHz, 90 db, 1 meter) as well as some of the select few that can pass a square wave (read they 're transient perfect). And yes they can sound a bit thin at the low end depending on system and set up of course, but nothing that a good sealed sub can't fix.