In 1979, after receiving a tip from a contact at New York's A&R Studios , Bill Stierhout began his career in audio, providing engineering support for leading pro audio companies Rupert Neve Inc. and Digital Entertainment Corp. / Mitsubushi Pro Audio. He installed consoles and digital tape machines in leading recording and broadcast studios.
After several years of service, he moved to Los Angeles and founded Coherence Systems, an engineering / technical support service to clients such as Warner Brothers, Sony, and Saban Entertainment. A collaboration with a data systems contractor led him to engineer a state-of-the-art audio/video/data center installation in Saudi Arabia.
By 1995 he was also marketing high end audio accessory and holistic health products for a sister company out of which emerged Quantum Life Products and subsequently, Quantum Products in 1999.
Quantum Resonant Technology™ was developed to investigate the physiological effects of electromagnetic fields in biomedical electronics and in the wellness/holistic health market. This technology eventually led to product development within the high end audio accessory market. QRT established and developed the electrical environment conditioning (emf harmonizer / tuner / resonator) niche within the AC power conditioner market.
Coherence Systems continues to offer engineering services for audio / pro-audio companies with emphasis primarily on electrical environment conditioning. ADD-Powr is the brand of its latest product development offering.
His first devices, the Quantum Symphony, Symphony Pro, and ElectroClear appeared in 1999, rapidly gained significant critical acclaim particularly in the high-end A/V market. The dramatic impact of these devices on display and sound quality was quickly appreciated.
In 2008 Nordost bought Quantum Products. They developed a line of products under the QRT™ brand, with great success. Quantum Resonance Technology™ has gained a much larger audience and has been embraced by audiophiles and the audio/video press world-wide.
Coherence Systems has re-entered the high-end A/V market with a new product line under the brand name ADD-Powr, a registered tradmark.
The mission is to disrupt the old standards of electrical energy generation and distribution with the introduction of a new energy reference.