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Audiosphere Research Monitor 18L Speakers For Sale ...
https://www.canuckaudiomart.com/details/649784227-audiosphere-research-monitor-18l-speakers/#:~:text=Similar%20items%20you%20might%20be%20interested%20in%20,Dec%2004%2C%202021%20%2016%20more%20rows%20
Audiosphere research Monitor 18L | Audiokarma Home …
https://audiokarma.org/forums/index.php?threads/audiosphere-research-monitor-18l.52003/
Location: Ontario, Canada. The Audiosphere 18L was built somewhere between 1982 and 1990 give or take. Built in Toronto region using 18" accordian edge woofers with a 60 oz magnet and two inch v.c. The woofers are enclosed in an air suspension enclosure and if I remember correctly, they had circuit breakers.
Steve's - Audiosphere Monitor 18-L dynamic speaker
http://www.audiocircuit.com/Home-Audio/Audiosphere/Monitor-18-L
The Audiosphere Monitor 18-L is a dynamic speaker. Bob (October 28, 2009): The Audiosphere 18L was built somewhere between 1982 and 1990 give or take. Built in Toronto region using 18" accordian edge woofers with a 60 oz magnet and two inch v.c. The woofers are enclosed in an air suspension enclosure and if I remember correctly, they had circuit breakers.
Audiosphere Research Monitor 18L Speakers For Sale ...
https://www.canuckaudiomart.com/details/649784227-audiosphere-research-monitor-18l-speakers/
anyone used or heard of Audiosphere Research? Massive ...
https://www.avsforum.com/threads/anyone-used-or-heard-of-audiosphere-research-massive-speakers-with-18-woofers.816911/page-2
The output of the 18L's is 98db 1watt at 1 meter and the sound dymanics are 102 db. The sound dynamics have had thier 15" woofers blown out several times each and were replaced under warranty for 5years, never had any issues with the audiosphere's to this day.
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