Airplain Acoustics writes. “With the airplain active loudspeakers, the name says it all. Phli, Pronounced like the word fly, it means phase-linear. All airplain products have this characteristic and this is what makes the sound so incredibly authentic. The main system includes a roon® and audirvana® compatible DSP streaming box*, which was developed by Weiss Engineering and allows various adjustments to the room. Both the main systems and the subwoofers are driven by integrated “Eigenakt” power amplifiers from Purifi. (*in certification process).