There is nothing off the shelf in this system. Every item has been hand selected tuned and tweaked with one purpose in mind; Producing the best sound reproduction possible. The dedicated listening room has isolated walls. A custom step down isolation transformer powers the system. Custom room treatments absorb and diffuse sound. The speakers are actively and passively bi-amped with a single ended amp on the horn and a push pull amp for the bass. The speakers are time aligned after the x-over and amplifiers. Improvements over the years are very slow as I long passed the point of diminishing returns.