I'm probably gonna put my tweeters in the a-pillars....and now I'm getting all confused. Should they be slightly angled forward towards the windshield, or slightly backwards towards the front seat passengers.

for example (i know this is an xb and we're talkin about a tC but it serves its point), these look like they're facing forward towards the windshield.

 

Well. Here is some advice that I got from Scott Buwalda, one of the more succesful IASCA SQ competitors who has used nothing but A-Pillar mounted tweeters. For positioning. Mount them on the A-pillar about 3-4 inches above the dash so they are above any design elements of the dash. Take a piece of paper and tape it on the glass all the way against the A-pillar on each side and have the center of it at the same height as the tweeters. Now, with a laser pointer, aim the tweeter to point in the middle of the piece of paper on the opposite side of the dash (left tweeter to right paper and vce versa. This should be a good place to start. Also, with A-pillar tweets you will want a high crossover point, 6K plus to prevent the tweeter from reflecting off of the windshield and off of the dash creating comb filtering. I hope this gets you the sound that you are after.

 

whats wrong with the spot their supposted to go into?

 

seems like you can create a much better soundstage with them on the a pillars. i like the laser method, thats seems like it'll do fine. however other opinions are still appreciated. thanks

 

I'd suggest trying two different positions, listen to both and decide which you prefer. The first would be to aim both of them upward and backward, both pointing at the rearview mirror. Second would be for the left tweeter to be aimed back and slightly upward, firing at the passenger's head, with the right tweeter aimed at the driver's head.

As for what's wrong with the stock location, many things. The pathlength differences are too great in the stock locations, moving them to the A-pliiars makes the pathlengths closer to equal. With the stock location you're also far off-axis to the nearest tweeter, and diretly on-axis with the other one. By placing them in the A-pliiars and aiming them at the opposite listener's head, the soundstage, imaging and frequency response is greatly improved for both listening positions, compared to the stock location. The same advantages can be acheived using kick panel mounting.

 

will do....i just read something about temporarily wiring the speakers and then velcroing them in different spots....looks like thats what ill do.

 

try this, sounds great

 

The problem with runn ing tweeters like this that have a significant f=difference in PLD is that you get massive near side bias. The reason to point the tweeters coincidental with the windshield is to make the near tweeter off axis and reduce the output of it relative to the farside tweeter. If all you care about is the sound from one seat then point them on axis and use judicious time alignment to align them for the drivers seat. My comments in the first post are the best method if you are trying to get the best possible image from both seats, which is how the upper classes in IASCA are judged. If you are not competing then mount them in stock locations and use time alaingment and EQ, you really have nothing to gain by mounting them in the a-pillar unless you are trying to get the best possible sound from both seats.

 

I'm going to try mounting my tweeters in the kick panel (double sided tape to test, than cutting holes for permanent mounting) and see how it works with the imaging.

 

id love to do that....i just dono who i could get to
'glass it for me though....

 

I posted this somewhere else too, but here's a good link for sound imaging: Component Tuning: Imaging and Goals

 

wow thats an awesome article thanks!