Ideal component placement for rear doors?

I have 1" and 2" components for the rear. Where should they go? Or should I just not install them?

 

who's listening?

for the rear passengers, they should be up in the b-pillar. but will be terrible for front seating music staging.

for the front passengers, best spot would be near the headliner in the c-pillar. but then it would be behind the rear passengers, and subject to comb filtering due to the distance from the woofer to the mid/tweeters.


i'm still playing with the idea to run a limited-bandwidth planar tweeter on a small delay in the rear headliner to increase the virtual 'size' of the cabin.

 

I’ve been thinking along similar lines, a small profile hybrid up high in the c-pillar, just don’t know how much room there is in those trim panels for pods. Then maybe devote the rear door panels to small subs.

 

i'm currently thinking of using these because i have them on hand. they're closed-back and very thin--i'm going to start just by mounting them with double-sided tape to the rear glass. other planar designs are open-back, which mounted with a gap ahead of the rear glass, could lead to an interesting direct/reflected setup.

https://www.parts-express.com/Dayton-Audio-PTMini-6-Planar-Tweeter-6-Ohm-275-083?quantity=1

but i'd personally give up on the rear doors as subs. there's just not a ton of airspace there, and low depth requirements eliminate any decent 6" sub from the running as well. i was pretty disappointed when i put a great set of peerless hds' back there and barely got anything out of them, though they do tend to prefer more open/IB doors. my current plan is to do a coaxial speaker(or a component with a floating tweeter) in the rear doors for doors-open party stuff, but leave them switched off most of the time.

 

hey, maybe i can afford planars after all....

 

I have used planar tweeters before long ago.... holy shit do they sound good.... I still have a set of infinity emit tweeters from a 1.1cs system I might have to install this summer.

 

Front stage/rear fill has always been the rule for a reason.

In a cab as small as our Tacoma's it's not a great idea to start throwing tweeters behind your head.

 

I'm pretty sure there is room but I don't feel good about mounting speakers on a panel labeled "air bag".

 

Hmm, yeah. There’s that.

 

Here is where I put mine.

 

Can you explain what this means for those of us that are dumb?

 

Fill is going to be the lower frequency stuff that is harder for our ears to pinpoint the location of in 3d space, while stage is anything higher. Fill is not necessary sub frequencies, it's just generally lower.

 

when you have overlapping frequencies coming from different speaker positions, there are a lot of physics involved in the interactions between those speakers. it's really easy to absolutely fuck up a very nice front stage by introducing rear speakers, especially in the higher frequencies which are far more susceptible to problems associated with relative height and specific direction than the lower frequencies.

however, with dsp's, skill and probably a great deal of patience, it is possible to overcome some of these pitfalls, but most people will tell you that it's a fool's errand.

 

rear fill isn't usually low frequency. the best rear fill is mid/high frequency, but with a limited bandwidth and on a delay.

the fundamental ideal of all this is that all the speakers, locations, and techniques are attempting to recreate a space larger than the reality of the vehicles dimensions.

ideally, if one closes their eyes, it should be possible to make it seem as if the entire band was sitting in front of the vehicle instead of sitting on the dash where the speakers are located, with the listener able to pinpoint where the drummer is setup behind all the main instruments, how the bass player is to the left just in front of the drums but behind the main singer, the singer is walking across the middle, and the guitar is to the front right.

proper rear fill is to make it seem like the back of the vehicle exists somewhere else entirely. while the front speakers purpose is to make the band sound as if they really were in front of the vehicle, the purpose of rear fill is to convince the listener that the space they're in is a space much larger than that of the vehicle interior. another word for this would be 'ambience', or 'presence'. we don't want the full tones of the instruments or singer coming through these speakers because no wall reflection has full tones of those things. we want a bandwidth-limited reflection of the front stage running on a delay here to imply the space is larger without physically placing the speakers outside of the vehicle.


which is exactly why installing speakers directly behind the drivers seat like they are in the tacoma are beyond useless. they're neither in-line with other speakers, at the same level of the listeners ears, or far enough back behind the listener to provide any sort of pseudo acoustics to imply that the space is different. in all reality, use of the rear speakers as they're placed down low and directly behind the listener really only works to make the sound stage more confined and more restrictive.