although when i had my solo 18 installed i was in Lubbock,TX doing some shopping and came across a low level car audio shop that had a blazer out front doing a demo the same year as mine at the time with a clamshell wall with 4 CVR 15"s off of 1500 watts that absolutely DEVASTATED my single solo 18 in 6.5cf with 5000 watts........was kinda disheartening lol.....way more displacement and box size for sure, but was probably like a 500 to 600 (if that) install when mine way cost over $2000 lol.....remember the MSRP of the solo X 18 when they redesigned them? gaaaawd ****....lol