Interesting claim. There is some shared history.
https://bagend.com/the-company/e-m-long/E. M. Long Associates consulted and licensed technology and patents to Bag End.
[Edward M Long] often worked with his associate Ron Wickersham in the field of audio transducers, specifically microphones and loudspeakers. Time-Align loudspeakers, Pressure Recording type microphones and Extended Low Frequency loudspeakers were invented by Ed and Ron and have proven to be fundamental advancements in the history of improving audio quality. Some form of these advancements are embedded in almost every audio recording today.
Pressure Recording Process™ (PRP). US Patent 4361736Ed and Ron, in studying the behavior of flush-mounted microphones, uncovered a basic error in thinking, which lead to the invention of a superior microphone. The Pressure Recording Process was the first fundamental microphone advancement in 50 years. Based upon the Pressure Recording Process (PRP) invention, Synergetic Audio Concepts trademarked the term PZM™ (Pressure Zone Microphone) and encouraged the implementation of the PRP patent. The first microphone to license technology in the PRP patent was the PZM™ made by Ken Wahrenbrock and then later the Radio Shack PZM™ and Crown PZM™ implemented PRP technology. Today Crown still manufactures PZM™ microphones based upon the PRP.
ELF Extended Low Frequency. US Patent 4481662
When improving the bandwidth of low frequency reproduction became the focus Ed contributed to Ron’s idea and they invented a method and apparatus for operating a loudspeaker below its resonant frequency known as Extended Low Frequency (ELF). ELF fundamentally allows low frequency extension of a loudspeaker system without degrading the phase response. With ELF the low frequency component of the sound is musically connected as part of the total sound. ELF provides greater overall impact and higher accuracy for music playback and recording systems as well as live sound reinforcement systems. The ELF system was first sold to the US Air Force for a portable PA system and later incorporated into CSI studio monitors and licensed to Bag End. Bag End offered a wide range of ELF subwoofer systems and today still utilizes the fundamental ELF principal in many products.
Time AlignmentEd Invented the first Time-Aligned loudspeaker system. A fundamental breakthrough in loudspeaker design, Time-Align® Loudspeakers assure that the fundamental and overtones of a complex, transient, acoustical signal are presented to the listener in the same relationship as the electrical signal at the input terminals of the loudspeaker. The instrumentation for this Loudspeaker design was self made by Ron Wickersham and speakers based upon this technique quickly became well respected for their quality and realism.
Ed’s design of the UREI Time Align® Studio Monitor 813 was widely praised and set a new standard of excellence in recording studio monitors.
An original hand written design note for the UREI 813.
Ed’s design of the Bag End TA-12 was widely accepted by musician for live music systems.
The original design data on the Bag End TA-12.
Ed designed the Sonex MKII a very well respected hi-fi speaker of its time.
Edward M. Long retired in 2003 and resided in San Jose, until his death on December 17th, 2016.
