"9.87 is simply the fullest-range, most natural-sounding one-way I’ve ever heard."
– Jonathan Valin, The Absolute Sound (June 2016)
"My third best sound of Newport Beach was Holger Adler’s $34.9k Voxativ 9.87 one-way (using Voxativ’s AC-4x spruce-wood-cone driver with neodymium magnet and whizzer tweeter in a folded-horn enclosure, which sits atop an active 12" dipole bass “extender”). Driven by Voxativ’s 845 SET monoblock amps and Ampeggio preamp, and sourced by Totaldac digital, this German masterpiece couldn’t be more different than Cessaro’s horns or Gauder’s steeply crossed-over multiways (both also from Germany, as it turns out), but its sound was, in its own way, just as fascinating and just as realistic. Neutral and absolutely seamless, the 9.87 (along with Voxativ’s Ampeggio Due) is simply the fullest-range, most natural-sounding one-way (or augmented one-way) I’ve ever heard. And once you’ve heard a speaker without a crossover that is this good, it makes everything else sound just the slightest bit cobbled together from parts. No, you’re not going to get the dynamic range of a horn speaker from the 9.87, nor quite the same resolution or treble extension that you get from the Gauder, but what you are going to get is true point-source imaging and a sound that doesn’t change a jot in timbre from octave to octave."