I dont have a definitive mounting depth, but the clearance is actually pretty good. Even with the generic Nissan mounting ring that comes free with crutchfield orders there is a decent amount of space. I was able to fit some Eclipse 5.25" in there fine. The center of the hole backs right to the guide for the window so you dont really have to worry about window clearance (i.e. you'll know if theres an issue immediately). If you use one of those Nissan speaker spacers they have on ebay I think you could mount practically any 6.5 or 5.25 in there fine.
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Home made fiberglass subwoofer in spare, Pioneer HU + nav, upgradred trunk lift springs.
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