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The new DSS tridents could work in 4.5 and that power but there's also ethos but power may be a little high depending of who you ask. A properly fitted 15 will probably sound better than an 18 smashed in a small box
None that I'm aware of. I agree what was said earlier, I would use a 15" in good space rather than squeezing an 18". There is a local member that is using 4cuft per 18" Ethos on 2 AA7.5ks, it's pretty brutal. Good for 58s tuned low.
165db with 237 DC Volts
6 15" SSA Evils
3 HV Taramps T60k @.33
18 XS Power D3400s
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