A second room uses the Telos wave generator. It ia a slightly different wavelength with more midrange bloom and less effect on highest frequencies. It is used on a dedicated headphone system!
By far the most advanced Schuman wave type generator is the Synergistic Research Atmosphere unit. By using two generated wavelenghts and pulsing them on and off, the user can greatly effect the sound in his room. It has a remote control function thru an Apple I Pad.
A most elegant, fexible, and practicle way to optimize the listening experience.
And since I enjoy music in my Honda Mini Van, I have an Acoustic Revive 777 mounted next to the ceiling in the vehicle. It even improves the sound here.
If you are serious about investigating improving you system's sound, I strongly recommend trying a Synergistic Research Atmosphere unit .Of the three units, it is the most powerful and adjustable. It is sold with a 30 day return option. I have not seen a used unit come up for sale at Audiogon.