[soundstream xxx 18]

Well I only had 2 hooked up bc I only had 1 Hifonics Colossus amp. But now I have 2 of them so I can hook up all 4 coils

[soundstream xxx 18]

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[soundstream xxx 18]

Ok I need some help guys. I have a soundstream XXX 18 sub in a 2002 Ford ranger extended cab on a Hifonics Colossus with only 2 of the 4 coils hooked up. Here's my problem: there's another kid in town that has a single cab truck that he plans on putting 2 15" kicker cvx's and a kicker l7 15... And I'm planning on buying a tahoe xlt this week... Would that soundstream xxx 18 be louder in a Tahoe, rather being in my little truck? And by my calculations, if he runs his 2 kicker cvxs, an his l7 at full power. He could only run 3k RMS at most! And I plan on running my Soundstream on 2 Hifonics Colossus 3200 watt RMS each amps, with the full electrical to back it up... My question is, since I would have a lot of airspace, would my single 18" soundstream on 6,400 watts RMS, be louder than his 3 kicker 15s on 3,000 RMS in his single cab pickup? Or would I need 2 soundstream 18s to make up for the airspace? Thanks guys