i've heard all of them nd own a 2 15" Brahmas the H2 is loud but not great SQ, w7 is great sound quality but not as good as the others, the xxx is prolli a close second to the brahmas 2003 GMC Yukon Denali headunit- Pioneer P8-mp Subs- 2 15" Adire Audio Brahmas Amps- Orion 2500D @ 1 ohm, Orion 8004(speakers) Speakers- 6.5" MB Quart QSD components, 6" by 9" MB Quart QSD components in back. Tweets- 1" MB Quart Titanium Battery- 2 optima yellow tops, stinger alternator Result- 158.6 db pushing 1250wrms to each sub(not fully powered)