I'd say...
I agree that all speakers and wiring should be well installed, almost hidden.
crappy boxes, big boxes are GAY cuz we cant pull the targa off whenever we want without moving the box(es)
(keeping this "almost hidden" in mind)
lets return to the discussion...
POLK audio 4" or 5", but the same all the way around.
This will promote a definite, but workable stereo soundstage in the car.
I used 4" to keep the stock box with no mods.
Hooked it up to the radio outputs. (poor mans gold)
The system is now midrange-ie, but predictable.
next... complete the mid bass.
We have no "trunk", so...
Use the largest speaker you can live with in the rear back lid deck.
Id love to try the rectangular plexiglass looking speaker (its a sub) i seen once
just hook it up as full audio (no band pass) to an amp using the rca output from the radio.
This will "fill" the lower band of sound that the 4", 5", or 6x9 cant make in our cars.
anyways,
This setup has a KILLER full-sound.
(I'd like to add a sub for that low-bass sound. but im still thinking how to make it POUND but fit inside the spare, or hidden somewhere in the back.)
heres the goods on the rear deck lid...
the first time I tried it...
I actually took the rear cover and traced it to make a stronger deck lid out of 1/8" plywood. I used a pair of 8" which gave that full sound that wasn't bass-ey.
the back lid needed a spacer to bolt back into the stock screwholes because I fabbed up a "shoebox" underneath to clear the speaker magnets.
This completes the "BOX" for the speaker.
I topped it with speakergrills, and the rug could lay on it without slapping into the speakers.
The rug kills most of the midrange sound leaving bass sound from ~90 hz to ~250hz range. This is that range that the 4" ers cant make good on in a supra.
DRAWBACK?- (its suited to individual tastes)
personally, I like HARD POUNDING BASS that is well rounded from crisp highs to lows.
why? Im an AUDIOFIEND. (??? the next gen audiophile???)
The pound of the bottom end gives all the depth and drama to the music.
(To control the sound, Id try to use separates and an electronic crossover to get it perfect. )