QRT/ADD-POWR

About QRT/ADD-POWR

QRT/ADD-POWR is a high-end audio brand specializing in innovative power optimization and electrical environment conditioning products based on proprietary technologies developed by Bill Stierhout. Originally known for Quantum Resonance Technology (QRT), which was acquired by Nordost in 2008 and underpins their acclaimed QRT line, the company evolved to launch ADD-POWR. The ADD-POWR brand uses Algorithm Digital Defined Power™ (ADDP), employing algorithmically generated electrical fields and harmonic resonators to enhance audio system performance without traditional power filtering or regeneration. Operated by Coherence Systems in Southern California, ADD-POWR's products are designed to reduce electrical noise and improve audio quality by transforming the AC and DC reference points in audio systems.