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This design is pretty popular - https://www.speakerplans.com/index.php?id=gsub
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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?
Cute, probably a good balance for most house parties. The ZXa5 I use for similar purposes are 133db SPL, they have to be kept reined in for most domestic situations. I'm looking for a sub I can lift alone that would keep up with them. A DIY option would be great.