The customer Mr K is an avid amateur pianist. He owns two grand pianos (Sauter Delta, Shigeru Kawai SK-6), and a Yamaha AvantGrand N3 hybrid piano. The Sauter and Shigeru Kawai grand pianos are located in the living room, whereas the Yamaha AvantGrand is located in a small bedroom.
The AvantGrand N3 is capable of playing as loud as a real piano. Although the loudness can be adjusted via the AvantGrand’s volume control the room imparts a ‘boxy’ colouration to the lower half of the keyboard, and a rather harsh ‘glare’ to the upper half of the keyboard. Bass articulation is also indistinct because of strong room modes. Mr K uses four UNISON SAP-75 panels on floor stands and six UNISON D-C diffusors on the ceiling to tame the room colouration. The ceiling diffusors also eliminated the intense slap-back echo off the ceiling, by dissipating the reflections rather than absorbing the sound.
Pictures to follow.
Cross-posted from here.