@gimpypimp
I asked my homie who is an audio installer, what he thought about your point on if they cheap its for a reason and he had this too say,
its not all about the subwoofer or how much money u spent on the subs, its about how much power u put to them and have the amps tuned correctly, let alone have amps that are sufficient and do no put out dirty power or the noise to distortion ratio is minimal. also you need to have the car dynamatted, and the spray shield in areas u cant get dynamt in. there are may ways to increase your DB's without having to spend a shit load of money on the subs.
i laugh at people who brag about having spents $600.00 per sub and oh wow look how hard they hit. that doesnt impress me, what impresses me is the person who spends $250.00 or less per sub and has the sub box built to specs and is designed right. who purchase not the most expensive amp but the amp that puts out excellent power, whom has the car dynamatted to keep in the sound and keep the rattling to a minimum and sounds just as good as any system someone paid $4000.00 for and he only paid half that
as far as the bulletproof glass thing, if in fact he had bullet proof glass and im not sure if it was either the box made of it or the windows or whatever, the thickness of it which is usually 2 inches thick or more is that its not allowing any of the bass to escape its acts as an enclosure so what there is minimal leakage for the sound to escape, in the sense he made the car sound proof where as all the sound in the car stays inside which will increase the db let alone keep the db's at a constant level becuz theres no escape of pressure.
also if i had to money spending the same amount you did for those Eclipse TI subs I would have got this. These handle 2000W RMS. My homie also said comparing yours to mine the only thing you have over me looks like a bigger magnet which could very well be my undoing if we did compete ever hehe. ITs all love though you know that dogg just dont want this thread to die.