Hello!
At age 81 I say I've been doing speaker crossovers for about 60 years. Began in college in late 1950's. By late 1990's I thought I was finished, holding patents licensed to Joseph Audio's lineof "infinite-slope" loudspeakers. License expired in 2005 and I went into blessed retirement atage 67. Thought I was done but......
Forget Joseph's record winning "best-sound" at audio shows and well-regarded reviews in audio press. Three pesky audiophile friends all owning Joseph's products demanded better sound from me and pushed me at age 79 in 2017 to perform research into possible improved crossover performance. Retrieved my notes now housed in local tech museum which led me to try idea: Merge my infinite-slope theory (based on high-selectivity filters in radio circuits) with "constant-resistance" technology.
Modeled crossovers in computer merging both concepts. Looking for a way to optimize frequency-response and time-response in midrange frequencies simultaneously, something I have only been able to attain nearly optimum in either frequency or time but not in both.I needed to minimize errors in both. By late 2018 I had models which in cyberspace appeared to have flat frequency response and linear-phase (flat time response) through midrange!
Built and tested physical crossovers, finished 2-way prototype speaker system.Prototype worked well in frequency-time measurements in my home instrumentation (FFT analyzer, 1/3 octave pink noise, etc.) showing flat frequency response, seamless "join" at 2KHz crossover! Repeat tests in anechoic chamber at Binghamton University which corroborated measurements. Box even had decent square-wave response 150Hz-2.5 KHz.
Listen test with 3 Joseph owners (myself included) at home lab and in audio showrooms and 2-way prototype had easily discernible "best-sound" against 3-pairs of Joseph Pearls, as well as against other $33,000+ loudspeaker systems. Word came out and I was invited to demonstrate speakers before audience of 300 at a symposium in August, with great success!
Installed 3-way invention crossover in three sets of Pearls, with astonishing results. Happy pesky audiophile friends rejoiced.! With performance validated, filed patent on July 2019.
RIMO
At age 81 I say I've been doing speaker crossovers for about 60 years. Began in college in late 1950's. By late 1990's I thought I was finished, holding patents licensed to Joseph Audio's lineof "infinite-slope" loudspeakers. License expired in 2005 and I went into blessed retirement atage 67. Thought I was done but......
Forget Joseph's record winning "best-sound" at audio shows and well-regarded reviews in audio press. Three pesky audiophile friends all owning Joseph's products demanded better sound from me and pushed me at age 79 in 2017 to perform research into possible improved crossover performance. Retrieved my notes now housed in local tech museum which led me to try idea: Merge my infinite-slope theory (based on high-selectivity filters in radio circuits) with "constant-resistance" technology.
Modeled crossovers in computer merging both concepts. Looking for a way to optimize frequency-response and time-response in midrange frequencies simultaneously, something I have only been able to attain nearly optimum in either frequency or time but not in both.I needed to minimize errors in both. By late 2018 I had models which in cyberspace appeared to have flat frequency response and linear-phase (flat time response) through midrange!
Built and tested physical crossovers, finished 2-way prototype speaker system.Prototype worked well in frequency-time measurements in my home instrumentation (FFT analyzer, 1/3 octave pink noise, etc.) showing flat frequency response, seamless "join" at 2KHz crossover! Repeat tests in anechoic chamber at Binghamton University which corroborated measurements. Box even had decent square-wave response 150Hz-2.5 KHz.
Listen test with 3 Joseph owners (myself included) at home lab and in audio showrooms and 2-way prototype had easily discernible "best-sound" against 3-pairs of Joseph Pearls, as well as against other $33,000+ loudspeaker systems. Word came out and I was invited to demonstrate speakers before audience of 300 at a symposium in August, with great success!
Installed 3-way invention crossover in three sets of Pearls, with astonishing results. Happy pesky audiophile friends rejoiced.! With performance validated, filed patent on July 2019.
RIMO