Dome mids +tweeters on dash?
03-14-2006, 07:39 AM
#1
Dome mids +tweeters on dash?
I have looked around and I cannot find any use of dome midranges mounted on the dash. A Vifa or Dynaudio 3" dome crossed over at 800Hz give or take. They are quite shallow, so could be mounted in a custom pod in the corners facing up, or on the pillars in a cross fire arrangement. I see regular 5 and 6" cone mids mounted in A pillars, but they are huge. I have never seen any dome mids on dashes. Maybe I have not looked enough.
Any comments on this?
Any comments on this?
03-14-2006, 08:39 AM
#2
Check out http://www.diymobileaudio.com/forum/ ... There is quite a lot of information on this topic, and other not so mainstream practices to be found there...
regards, Mark
regards, Mark
03-14-2006, 08:53 AM
#4
Guest
Posts: n/a
there are alot of vehicles with dome winds mounted in the pillar and on top of the dash. i did a h2 with midbass in the doors and a 3" dome mid and 25mm silk dome tweeter in the a pillar. this design philosophy is complicated for 2 main reasons. first being the distance between the midrange and the midbass especially in the critical 500 to 800 or 900hz crossover point range, typically not an area that you want to be playing around in unlsess you have a ton of crossover point and slope options, aka a really flexible electronic crossover. the second reason is pathlegnth differences, the differences between your midbass and midrange are likely going to be quite different and we all know what major pld's can do in a 3 way systems, if you dont know what it will do, i will smear your image, be difficulty to get a center image and if u do manage to get a shred of center it will be likely shifting all over god creation. now if you are going for good sound in one seat and have lots of flexibility in the crossover point and slope, and have craploads of t/a you can get a good sounding stereo in one seat but you will still have your work cutout for with secondary reflections off the dash and windshield and edge diffraction and cool things like that, that can ruin your whole day
Last edited by defro13; 03-14-2006 at 08:55 AM.
03-20-2006, 09:03 PM
#5
0 Watt CAFz'r
Join Date: Mar 2005
Posts: 17
Originally Posted by defro13
there are alot of vehicles with dome winds mounted in the pillar and on top of the dash. i did a h2 with midbass in the doors and a 3" dome mid and 25mm silk dome tweeter in the a pillar. this design philosophy is complicated for 2 main reasons. first being the distance between the midrange and the midbass especially in the critical 500 to 800 or 900hz crossover point range, typically not an area that you want to be playing around in unlsess you have a ton of crossover point and slope options, aka a really flexible electronic crossover. the second reason is pathlegnth differences, the differences between your midbass and midrange are likely going to be quite different and we all know what major pld's can do in a 3 way systems, if you dont know what it will do, i will smear your image, be difficulty to get a center image and if u do manage to get a shred of center it will be likely shifting all over god creation. now if you are going for good sound in one seat and have lots of flexibility in the crossover point and slope, and have craploads of t/a you can get a good sounding stereo in one seat but you will still have your work cutout for with secondary reflections off the dash and windshield and edge diffraction and cool things like that, that can ruin your whole day
03-21-2006, 11:15 AM
#7
1000 Watt CAFz'r
Join Date: May 2002
Posts: 1,649
Tweets - mainly axis related
Mids - combination of PLD's and axis relationship
Midbass - PLD's
As has been discussed many times before, the above basically tells you why the mid should always be addressed first as it's the hardest to place........ relatively speaking. If your kicks are nice an big, ideally would be nice to get the midbass as far away as possible with the mids close second......... and if you have a mid that goes nicely up to 5K to 6K, then easily put your tweets up on the dash aimed slightly up but in parallel as much as possible to the curvature of the front window. If you have a nice deep dash, then putting the mids up on the dash is very do-able, but still will have to tune them pretty intensively.
Anyways, the end goal should be to get your placement of the drivers in such a way that the tuning is as minimal as possible. This is what takes a lot of time and truly makes great installs stand out, regardless of the equipment, all things being relatively equal.
Mids - combination of PLD's and axis relationship
Midbass - PLD's
As has been discussed many times before, the above basically tells you why the mid should always be addressed first as it's the hardest to place........ relatively speaking. If your kicks are nice an big, ideally would be nice to get the midbass as far away as possible with the mids close second......... and if you have a mid that goes nicely up to 5K to 6K, then easily put your tweets up on the dash aimed slightly up but in parallel as much as possible to the curvature of the front window. If you have a nice deep dash, then putting the mids up on the dash is very do-able, but still will have to tune them pretty intensively.
Anyways, the end goal should be to get your placement of the drivers in such a way that the tuning is as minimal as possible. This is what takes a lot of time and truly makes great installs stand out, regardless of the equipment, all things being relatively equal.
03-21-2006, 11:51 AM
#8
500 Watt CAFz'r
Join Date: Mar 2005
Posts: 884
Originally Posted by bigwise1
so would mid range in kicks, mid bass in doors, and tweets in a-pilars be better?
03-21-2006, 12:47 PM
#9
1000 Watt CAFz'r
Join Date: Sep 2001
Posts: 1,120
What's interesting to me is once you been goofing around with car audio to the point where you've pretty much come to an understanding of the formula required for success, well, we come to this one item: A mid that plays clean up to 6,000-7,000 Hz...that characteristic lays out some nice options for positioning of drivers.
Tweeters can be put up on the dash or a-pillars like dawg suggested, creating a nice sense of "air" without the directionality problem as long as they're run above approx 6000 or so. I like 6200 - 6500 personally.
PDLs seem to be critical down to 80-120. So not very likely that a mid can play up to 6 or 7 k and cover the gap to down low like that, so a midbass is most likely to be needed.
I've been keeping a casual eye out for a mid that plays really clean up to that range, from about 200 -250 hz and up. and can handle some power like say 75 wrms.
I would love to find such a mid if someone has a suggestion.
Tweeters can be put up on the dash or a-pillars like dawg suggested, creating a nice sense of "air" without the directionality problem as long as they're run above approx 6000 or so. I like 6200 - 6500 personally.
PDLs seem to be critical down to 80-120. So not very likely that a mid can play up to 6 or 7 k and cover the gap to down low like that, so a midbass is most likely to be needed.
I've been keeping a casual eye out for a mid that plays really clean up to that range, from about 200 -250 hz and up. and can handle some power like say 75 wrms.
I would love to find such a mid if someone has a suggestion.
03-21-2006, 02:20 PM
#10
I play my 4's from 200 up to 5k, and they are supplied with about 75 RMS per channel. Granted, I'm using old and cheap (now; weren't reallly then) Rockford Power Series mids and an old Rockford 4080 DSM amp but amazingly I still get very clean sound.
