Indeed, those products were also available from Quantum in the early 2000s. There are posted reviews of said devices at the ADD-Powr site.
Apparently the Symphony made a big impression upon the reviewer, Doug Blackburn of Widescreen Review. He reviewed many AC power conditioners, including Monster Cable, Shunyata, and the Quantum unit's sonic benefits out-performed the others.
Apparently the Symphony made a big impression upon the reviewer, Doug Blackburn of Widescreen Review. He reviewed many AC power conditioners, including Monster Cable, Shunyata, and the Quantum unit's sonic benefits out-performed the others.