QUOTE (keepitreal07 @ Mar 27 2008, 08:37 PM)

ok matt when are you next in perth as i am half way through them...looking good actually.....i got no idea if they are the same etc but they sound better then they were.....just need image tweeters but that no problem as i got 4 sets of them
i have the mids as deep towards the front as i can but the drivers a bit of a pain as its close to the pedal (5mm)
"The tweeter provides the spatial cues on the room"
"Baffle step response will kill the FR."
I have no idea what this means please explain
the tweeters are right next to it on the same angle as the mids....it sounds nice
Firstly, your running with the focal mid, so your crossover to the tweeters should be above 5-ish k. This means that you don't need to 'focus' the tweeters for imaging. There is no image above 5k.
Spatial cues is a term used to describe the audible 'indications' of the size of the 'room' being portrayed by the speakers. The tweeter is the key to understanding whether you're listening to an outside recording (no walls), a recording in a large room, or a recording in a small room. Try to get a 'large room' perspective inside your car, because that will go a long way to removing the cars boundaries from the music (thinking you're inside the car listening to a CD, or just at the concert is a comfortable chair). This is one of the reasons why tweeters are so critical to the reproduction. They modify the perception of the physical boundaries.
Baffle Step Response is a frequency response issue, that occurs when a wave is produced by the tweeter but becomes 'ragged' at the edges (far off axis) because the baffle is poor. This affects off-axis responses much more then on-axis, but in a car, you're listening off-axis. When tweeters are surface mounted, or mounted any-old place, you get breakups around a particular frequency because the wavelength is moving along the baffle, but 'drops' off the perch as it extends out from the dome. The step on a surface mounted tweeter causes this.
This is one of the reasons why the old Esotar worked so incredibly well. It had a baffle that was almost big enough to eliminate this problem, before you even installed it. That is also why flush mounting is always the best option. Because you use the smooth surface of the mounting to 'be' the baffle.