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my knowledge comes from experience. if you're wanting to be an installer as a profession it'd be worth the money, but if you're wanting to drop $5G on a class just so you can tinker with your own stuff i'd say it's a waste. but it's your money, go with what you want :).
as for the grilles. i've got 5 1/4s in my gf's car and it looks stock....aside from the tweeter. but the midrange is behind the stock grille cover. i was just wondering how you mounted them to be using the cover supplied by JL. unless you had custom built kick panels i dont think you'd notice a real big difference. since a mass produced pair would be facing, in essence, the same way as the ones in your doors. BUT, if you custom built some to angle the speakers toward your ears you would notice a difference.
and about the crossover......they work as a team. but a dedicated electronic crossover is probably 10x better at doing it's job than the built in crossover. think of it like a fuel management system. is the factory one going to do a better job than one that that's it's only job is to manage your fuel/spark system? highly doubtful. i've technically got 3 crossovers on my sub in my truck. the headunit has a built in low pass, then i have a kicker electronic x-over and then i have the one on the amp. are all 3 necessary? no, but then you have infinite adjustability vs. preset x-over points. in emily's car im running a KX3....which is a GREAT x-over. so i guess the "ruler" would be the external electronic x-over, it's going to pick up the slack left behind by the other ones. 70 Hz is still kind low IMO. i've got emily's crossed over at 100 Hz. at 70 your still trying to produce those low notes that makes the speakers work real hard. do you have subs? if you dont then you're gonna want the x-over point a little lower so you can still hear those notes, but if you have a sub i'd let it handle those frequencies.......that's what they're made for. :)
i was just thinking of the slide out drawers being in the way...on top of being hard to make and make look good. with it being behind the carpet it's more camoflauged (sp?) and once you get the settings to where they sound good how many times are you going to adjust it?? im going to say not many. it's not like an equalizer where you can change it from song to song. and i dont thing peoples feet would be a problem really, unless you have some rough passengers lol. people start kicking things that hard in my ride their ass is going to be walking anyway :p.
and fiberglass.......it's like bondo yet it isn't either. it's the same prinicple. but 2 totally different substances IMO. which i've only got a little bit of fiberglass experience. i know people that can work wonders with it.........i'm not one of those, yet anyways :D. i just fiberglassed a flush-mount TV for my trucks glove box. i put a couple thin layers of fiberglass on so it wouldn't have as much give to it and then i used bondo after that. i just think bondo is a little easier to work with, but i guess cause im used to it. anyways, if it's something you want to learn then by all means go for it. im the same way, if i want to learn how to do something i'll go to the moon to learn it.
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