Funny. I've had an idea for quite a while that said using a full range in the apex of the windshield and dashboard would possibly bring about the best quality when looking at speaker response and tuning characteristics.
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Typically we have a terrible problem with tuning because we're always having to find a compromise:
i.e.
1) Using a two way system that crosses through our mid-range response. Some speaker setups attempt to emphasize mid-bass and therefore the mid speaker typically doesn't do mid-range very well or starts to beam early. In this scenario you need a tweeter that probably crosses somewhere in the mid to upper 2khz frequency range with a 12db slope. The advantage to this setup is your bass should be brought up front so long as your sub doesn't over-power the mids. The downside is attempting to match the tweeter + mid in frequency response. Now we have to spend careful consideration when crossing the mid. Usually, in this scenario your best bet is to carry the tweeter in the a pillar or somewhere similar and attempt to use a shallow slope in the tweeter. However, due to phase characteristics we probably want to keep with a 12db slope from our mids or 24db slope. Anyways, most people are using their mids in the doors at this point. So a very careful decision must be made...do we mod our doors so that they act more like an "enclosure" or do we find another way to design an enclosure for the mid?
2) In this scenario you have a mid that is designed for a mid-range capacity and may not be so great....
you know what I'll stop talking and if people are truly interested I'll answer questions
Bottom line, I think F.A.S.T. brings about the best potential for compromised installation vs. processing...so long as you have the install skills. The downside is finding a full range speaker that meets your listening needs.
