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Thanks for the link, just had a chance to study it. 2 x Fane 18" drivers = 28.4kg to start with, guesstimating this would be between 40 & 50kilos finished. That's a back breaking bit of kit for 1 person! but 8k max power, 2000w program is pretty significant.
I'm kind of looking for a magic solution that weighs less and does more than it should. Transmission line maybe?
Airhead-
Your likely just going to swap driver weight for cabinet weight, unless you make a horribly resonant flimsy enclosure.
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Probably start with modern neodymium magnet drivers and there’s a lot of chat about how 15” stuff is often better than 18”. What mains are you matching it to?
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Well, MLTL cabinets are at least mostly air unlike the labyrinthine insides of a folded horn. I can't say I've come across any for PA drivers though.
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Speaking of...
danb
Dramatic_Hammer
exteroceptive
This design is pretty popular - https://www.speakerplans.com/index.php?id=gsub