Re: ICE and my 147
About the kick panels, the 16.5cm midbasses need larger box volume to work well, so you ll need to sacrifice some extra space for the kicks. The dash is too big and it comes quite towards the listener so from a visual point of view, it seemed to me that it wouldn't work well for the soundstage. But i ve heard one in real and the stage was there, and it didnt seem to come from the feet but from the front. So it can be done as long as the installer is a really experienced and knows what he is doing.
On the other hand, the stock positions for the midbass are high, they not hiding by the feet, I d say they re in a good position. The stock grill is a disaster though. The door gets quite solid if you apply dynamat, and the midbass can go real low if you soundproof the door. It can go low, and "kick" well at the same time.
The tweeter's stock position is a mess though. Its too close to the listener's ears, which makes any balanced (matched with the midbass) tweeter sound too loud, giving a harsh sound.
Its also too far from the woofer, creating phase mismatching with the woofer's signal (messing up the mid range -reversing the polarity could help, depending on the speaker set). the closest to the woofer the better (phase point of view speaking - as long as the crossover was desinged that way, but it seems in practice that its done this way). I ve put the tweeter's on the mirror's plasic triangles, not the best thing to do (since there are reflections from the glass) but much better than the stock position ( distances woofer-ear and tweeter-ear are now more similar). Also
the sound seems to come from the front, and not from the sides that the stock tweeter positions give. best position imho is right above the woofer and as close to the dash as possible, but the glove compartment wont be able to open unless the tweeter is flush mounted (which is out of the question, i wouldnt like permanent changes to my bella's trim)