Integrated avionics suites are proliferating like rabbits. The groundbreakers — Honeywell's Primus, Rockwell Collins' Pro Line and Universal Avionics UNS series helped to spawn Garmin's string of popular “G-000” series.

Touted as “the world's first integrated intelligent aircraft cabin shading and noise reduction system,” the iShade iQ, InspecTech Aero Service's latest addition to its iShade series of electronic dimmable windows, is able to reduce cabin noise levels.

Thus far, we've talked about eliminating or minimizing sound. But for some operators, maximizing a cabin's audio qualities is of great importance. For those whose key passengers expect nothing less than an airborne symphony hall, IMAX theater, arena event or just some quiet meditation, a fourth way may be the path to audio bliss.