Yeah, I considered the possibility that the sleeve wasn't in the dash kit snugly enough, and it's likely given that the tabs, even at the full 90 degrees they are, aren't enough to stiffen things up to the point that the HU is completely supported. That's my theory at this point. Rubber bumpers, eh? That could be a good alternative, and would 'give' enough in normal usage, perhaps to include bashing over the evil, evil devices to which you refer.
I hate the lack of space you mention as well, but I guess that's what happens when, as I understand it, auto manufacturers tend to include sound system design as more or less an afterthought, and perhaps have done all along. Or maybe they're in cahoots with aftermarket companies and it's mutually beneficial? And I suppose that if space wasn't conserved where it can be, we'd all be driving vehicles the size of Sherman tanks! LOL!
If you thought I seemed confused and/or out of my depth around this somewhat minor installation of a HU, you ain't seen nothin' yet - just add the whole amplifier/subwoofer configuration thing and I am totally lost. I knew the speaker sizes after doing the research on both Crutchfield and Sonic Electronix' sites and I'm cool with replacing those...can't imagine that it would be any harder than the HU installation if it's just a rough 'plug and play' proposition. But adding bass, that's going to prove maybe a little tougher. As my profile information indicates, I am 47 years old and don't even pretend to enjoy much of what passes for music in this day and age; I am instead stuck in a time warp that pretty much ended in the '80s (according to a few of my friends, they'd say that it was the 1780s
as I listen to a lot of classical and traditional 'cultural' music), so the need for a system with bass that'll defibrillate me while I drive is hardly necessary.
A few years back I bought a good 8" subwoofer with the intention of setting up an infinite baffle 'enclosure' on the advice of an amateur installer buddy, but he ended up being deployed (Marine) and everyone moved on so I never did get that done, but I still have the subwoofer and was thinking about getting an enclosure for it. From all I've read about an actual box relative to my musical taste, inclusive of the music previously mentioned, and considering that I primarily listen to classic rock, the 8" subwoofer in a ported box would likely suffice, but just barely. Yeah, a 10" subwoofer would probably be better, but since I already have the subwoofer I might try that first, with an amplifier that could also accept the use of a 10" subwoofer should it come to that.
I am also considering the much maligned - at least here on this forum - Bazooka amplified tube in the smallish 6.5" size. I know, don't even start, it's probably sacrilegious to even mention such a thing, but I have an 8" Bazooka tube in my '89 full-size Bronco and it's just about perfect for me, and the Bronco has a whole lot more room to fill with bass. Plus, again, the relative ease of installation of a 6.5" amplified tube does have its appeal.
Before anyone unloads on me about the Bazooka, please realize that I'm just speculating at this point...nothing's sure around this yet!
Of course, I will continue to read of others' experiences in the realm of car audio, particularly here since that's the type of vehicle I'm trying to outfit, and believe me, if something strikes me as particularly ingenious or magnificently suitable, I will explore the possibilities and most likely ask a ton of questions!