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Old 08-23-2013, 06:07 PM   #1
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4" Speaker in TJ A-Pillar

I've been an audiophile since the early 90's, so when I turned up the stereo (which was aftermarket) in the Jeep, I knew I had to make some upgrades. The first thing I did was upgrade the front speaker with some Nalin adapters. They were good, but I wanted more front-fill and less speaker playing to my knees, so I decided to do something about it. Along with being an audiophile, I also do fiberglass/composite work. I figured I could do something pretty darn cool and push the envelope...and I think I did.

I started with the original a-pillar and got the form I wanted:





Then I did some test-fitting and set-up:






Then I made some molds and vacuum-bagged (using a custom latex bag) the pillar. I ended up having to do a split mold, but I don't have pictures of both sides:






Out of the mold, cleaned up and sprayed with Rustoleum bed liner:







Installed:





















I went with Polk Audio db401 speakers, just because I like Polk Audio.

Next up is making a new glovebox (less depth) to mount my amp behind, then I'll be working on the subwoofer box for inside the console.


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Old 08-23-2013, 08:36 PM   #2
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You know that you may really be on to something there! You might get some interest from others on these. Have you considered making them to sell?

Just something to think about..

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Old 08-23-2013, 09:30 PM   #3
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I know exactly what you mean as far as the locations not lending much to the stage.. I went with q-forms kickpanel enclosures and components and it really did a great job of placing the sound in the windshield!! I don't have my front dash speakers hooked up at all and fade the soundbar almost totally out.. coupled with a couple amps and a sub and it's not too shabby for a jeep!

Your fab skills look great!! Hope you enjoy the setup!
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Old 08-23-2013, 11:06 PM   #4
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Thats some nice work you did there. Im sure people would pay good for something like those. I liked having the better speakers in the soundbar because its much close to my ears(im 6'8") so im really close to the soundbar. I ran infinity perfect components in the soundbar and dash. Powered with an incriminator audio amp. For a sub stage i had a 12" deathrow from incriminator audio running on an mb quart dsc series amp. For my sub enclosure i called nick from IA for advice on building the best possible enclosure for the sub.
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Old 01-06-2014, 02:59 PM   #5
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I like these
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Old 01-06-2014, 11:32 PM   #6
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Very Nice Idea. But, I think I would have angled them more towards the driver instead of towards the dash. And, I think you mentioned using 4" speakers, when 5.25 speakers would probably be best. This is because the sound bar speakers are 5.25, and they are right next to your ears. To improve the sound stage, with the 5.25 rear speakers being right next to your ears, it is probably best to use 5.25 speakers in the front, and position them facing your ears too. I like the height though. Good idea.

You also might try using 5.25 component speakers, with the tweeters facing your ears, in the fiberglass, and the mid range in the stock position. The tweeter, right in your face, might compensate for the rear speakers in the sound bar. Just having the tweeters in the fiberglass, might allow your to face them more towards the driver, while decreasing the size of the fiberglass. You could probably even raise the tweeters, so they are closer to your face.

Great fabrication work too. It looks really clean and professional.
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Old 01-06-2014, 11:43 PM   #7
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Next up is making a new glovebox (less depth) to mount my amp behind, then I'll be working on the subwoofer box for inside the console.
skinny pedal has pretty much conquered that problem with the Alpine amp mounted under the dash.

TJ/LJ Amp Mount

I think you have a great idea with the front fiberglass mounts. Maybe you could even design 5.25 component midrange speakers in the stock position with fiberglass, and mount them facing more towards the driver too. And then, just have the tweeters above the dash in the fiberglass.
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Old 01-08-2014, 08:14 AM   #8
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Very Nice Idea. But, I think I would have angled them more towards the driver instead of towards the dash. And, I think you mentioned using 4" speakers, when 5.25 speakers would probably be best. This is because the sound bar speakers are 5.25, and they are right next to your ears. To improve the sound stage, with the 5.25 rear speakers being right next to your ears, it is probably best to use 5.25 speakers in the front, and position them facing your ears too. I like the height though. Good idea.

You also might try using 5.25 component speakers, with the tweeters facing your ears, in the fiberglass, and the mid range in the stock position. The tweeter, right in your face, might compensate for the rear speakers in the sound bar. Just having the tweeters in the fiberglass, might allow your to face them more towards the driver, while decreasing the size of the fiberglass. You could probably even raise the tweeters, so they are closer to your face.

Great fabrication work too. It looks really clean and professional.

I went with 4" in the pillar just to add upper-stage to the 5.25's Polk's I have mounted in an adapter in the stock knee-position and to round-out my front stage (minus a center channel which I don't think is needed in my budget'ish, ready to be stolen set-up). The 4"'s are really just there for filler, not as primary drivers and mainly because I enjoy playing with composites. They are pointed more towards the windows to allow reflect sound (mirror waves) to add millisecondss to the soundwave and to be closer matched to the distance of travel from the lower 5.25" ones...similar to time-alignment but using good ol' math versus machine. The rear sound bars are attenuated via the amp (and an O-scope) so 80%'ish of my sound is coming from the front soundstage (IMO rear should be just minimal anyways) so I can get full-range in the front that is not drowned out by the rears. For highs, I do have some tweeters, they're just not in view unless you know where to look.
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Old 01-08-2014, 11:37 AM   #9
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Those turned out beautiful!
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Old 01-08-2014, 03:49 PM   #10
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I went with 4" in the pillar just to add upper-stage to the 5.25's Polk's I have mounted in an adapter in the stock knee-position and to round-out my front stage (minus a center channel which I don't think is needed in my budget'ish, ready to be stolen set-up). The 4"'s are really just there for filler, not as primary drivers and mainly because I enjoy playing with composites. They are pointed more towards the windows to allow reflect sound (mirror waves) to add millisecondss to the soundwave and to be closer matched to the distance of travel from the lower 5.25" ones...similar to time-alignment but using good ol' math versus machine. The rear sound bars are attenuated via the amp (and an O-scope) so 80%'ish of my sound is coming from the front soundstage (IMO rear should be just minimal anyways) so I can get full-range in the front that is not drowned out by the rears. For highs, I do have some tweeters, they're just not in view unless you know where to look.
Very Impressive. It sounds like you put a lot of thought into them.
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Old 01-10-2014, 10:43 PM   #11
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That is by far the most professional looking speaker mod i've ever seen done....good job! I installed the skypod from select increments with polks and it was one of the best speaker installs i ever did, especially with the top off.

I also did the nalin mfg tweeter install on the front speakers as well.

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Old 01-10-2014, 11:42 PM   #12
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That is by far the most professional looking speaker mod i've ever seen done....good job! I installed the skypod from select increments with polks and it was one of the best speaker installs i ever did, especially with the top off.

I also did the nalin mfg tweeter install on the front speakers as well.

Nice. I really like all these stereo mods on Wranglers. I'm curious about the wiring and install. Did you wire together the front speakers in left skypod with the left lower dash speakers? Secondly, why is there metal exposed on both sides on the top of the windshield?
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Old 01-11-2014, 09:16 AM   #13
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The metal is where the latch for the hard/soft top hook in to secure it....normally covered by the visor. You can see it in my second pic up top...
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Old 01-13-2014, 09:30 PM   #14
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Nice. I really like all these stereo mods on Wranglers. I'm curious about the wiring and install. Did you wire together the front speakers in left skypod with the left lower dash speakers? Secondly, why is there metal exposed on both sides on the top of the windshield?
I ran a 4-channel amp to the front dash speakers & the soundbar, and ran the skypod speakers off of the headunit.
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Old 01-13-2014, 09:31 PM   #15
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GRUMPHF, how did you wire your speakers? amps? did you run any subs?
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Old 01-13-2014, 10:11 PM   #16
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I ran a 4-channel amp to the front dash speakers & the soundbar, and ran the skypod speakers off of the headunit.
Hmm. So, you are saying that your front skypod speakers are not powered, but your front dash speakers are powered?

I've never heard of anyone doing it that way. Why not just tie together the front dash and Skypod speakers, left to left, and right to right, thereby, balancing them and splitting the front channel power from the amp. That is if the Skypod speakers can handle half of the front channels power.

You might get better fill that way. Just a suggestion.
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Old 01-14-2014, 12:48 AM   #17
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Hmm. So, you are saying that your front skypod speakers are not powered, but your front dash speakers are powered? I've never heard of anyone doing it that way. Why not just tie together the front dash and Skypod speakers, left to left, and right to right, thereby, balancing them and splitting the front channel power from the amp. That is if the Skypod speakers can handle half of the front channels power. You might get better fill that way. Just a suggestion.
He said the front pods are running off of the head unit. The head unit puts out power, therefore they are powered. I'm sure this setup has great fill the way he has it, you wouldn't want too much sound coming from the corner of the windshield.

On another note, I love this idea and have been considering something like it. I lack your fabrication skills, though. Any tips?
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Old 01-14-2014, 01:41 AM   #18
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He said the front pods are running off of the head unit. The head unit puts out power, therefore they are powered. I'm sure this setup has great fill the way he has it, you wouldn't want too much sound coming from the corner of the windshield.

On another note, I love this idea and have been considering something like it. I lack your fabrication skills, though. Any tips?
The head unit doesn't put out the same power as the amplifier. This is obvious. When, I say powered, I meant above the stock HU power. If you have a HU that puts out 12watts RMS, and then you have a amp that puts out 60 watts, there is a great difference.

In such a setup, you have 12watts vs. 60 watts. You have two speakers at 12watts, and two speakers at 60 watts, instead of spreading that 60watts over four speakers. Spreading that 60 watts, would give you better fill. This is all that I am saying.

Look at it like this. Of course, you would get better fill in the first scenario.

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Old 01-14-2014, 07:58 AM   #19
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The head unit doesn't put out the same power as the amplifier. This is obvious. When, I say powered, I meant above the stock HU power. If you have a HU that puts out 12watts RMS, and then you have a amp that puts out 60 watts, there is a great difference. In such a setup, you have 12watts vs. 60 watts. You have two speakers at 12watts, and two speakers at 60 watts, instead of spreading that 60watts over four speakers. Spreading that 60 watts, would give you better fill. This is all that I am saying. Look at it like this. Of course, you would get better fill in the first scenario.
Saying it isn't powered is fundamentally wrong, but I do understand where you're coming from. Running them at the same wattage doesn't necessarily mean there would be "better" fill, though. Especially in an environment like a wrangler.
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Old 01-15-2014, 04:56 PM   #20
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GRUMPHF, how did you wire your speakers? amps? did you run any subs?
I am running a 5-channel amp...the fronts (upper and lower) at 2-ohms and the rear at 4-ohms. I haven't decided if I want to do an 8" or 10" in the center console or a 12" under the rear seat, so I'm not using the sub channel yet.
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Old 01-15-2014, 06:30 PM   #21
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Saying it isn't powered is fundamentally wrong, but I do understand where you're coming from.
I don't think you do, He said that the speakers were "not powered" by the amp. Of course when I said "not powered", I meant by the amp. There is nothing fundamentally wrong in that statement. I can't argue about semantics.

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Running them at the same wattage doesn't necessarily mean there would be "better" fill, though. Especially in an environment like a wrangler.
I think you are just being argumentative. Of course having equal spread wattage across an area, gives better fill than having 6-30wattage drops across the same area. Anyone can see that. I even created a diagram to help you see it better. If you refuse to see it, or, for some reason, you are unable to see it, I'm sorry.

I can't hijack this thread with this sort of arguing. I was just making a friendly suggestion.
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Old 01-16-2014, 12:45 AM   #22
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I am running a 5-channel amp...the fronts (upper and lower) at 2-ohms and the rear at 4-ohms. I haven't decided if I want to do an 8" or 10" in the center console or a 12" under the rear seat, so I'm not using the sub channel yet.
Having the front speakers at 2 ohms, and the rear speakers at 4 ohms, does increase the sensitivity to the front speakers. This is good for the sound stage. I would just be concerned though with the handling capacity of the front speakers, when using a 4 ohm amp.

I actually had great response from my 2 ohm front Infinity Kappa speakers. Unfortunately, my Infinity Kappa's, couldn't handle my 4 ohm amp, and they blew out after a few months.

It also might be interesting to add a crossover to the console speaker, and adjust the crossover to bass frequencies for the console speaker.

Then, you could use 10" subwoofers for the woofer/subwoofer frequencies.

If everything is set optimally, I could imagine a great sound stage. Just a suggestion.
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Old 01-16-2014, 01:59 AM   #23
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I am running a 5-channel amp...the fronts (upper and lower) at 2-ohms and the rear at 4-ohms. I haven't decided if I want to do an 8" or 10" in the center console or a 12" under the rear seat, so I'm not using the sub channel yet.
I like the setup, let us know what you decide on. I have to give you props again on the pillars, seriously professional looking.

The jeep I just sold had the perfect setup for me at least. I just bought an LJ completely stock and am starting over again.

Since there's been discussion about how I ran it (not to hijack the thread) I had a total of 8 speakers + console sub and two down fire 10s in the back (a tad bit of an audiophile myself).

Front speakers:
. Sky pod - 4" Polk db - HU
. Dash speakers - 5.25" Polk components - 4-channel amp
. Sound bar - 6.5" JBL - 4-channel
. Rear Versa Pods - 4" Rockford fosgate - HU
. Two JL Audio 10s - mono block Rockford amp

I replaced the stock console sub with an aftermarket 6.5 midwoofer at 4 ohm off of the 4-channel before I installed the versa pods in the rear. Then I decided to upgrade to a 10" sub in the console....mistake, ended up disconnecting and not having a sub in the console; the space couldn't handle the 10" sub and bass response I was looking at.

Looking back what I liked and what I would change. As soon as I added subs in the back I should have been content with the midwoofer in the console, no upgraded needed on the bass side, couldn't tell. The versa pods in the rear even with the high end fosgates weren't worth it because 4" speakers can only provide so much, considering your head is right next to the soundbar and they're a pretty good distance mounted right next to the roll bar in the rear. Also I replaced my I nfinity reference coaxial speakers in the dash with Polk db components and felt like I actually loss some clarify and response.

I personally believe running an amp to 4" Polk db speakers (as opposed to the 5.25 dash & 6.5" soundbar) was a no brainer. I ended up having to fade out the skypod speakers anyways because of the frontal imaging. I had faith in my stereos RMS capabilities to run two sets of 4" speakers.

Sorry for the long explanation. I would go with an 8" in the console or the 12" under the seat. With my LJ I already have a slim Pioneer 12 mounted as a downfire with a small profile, so we'll see if that gets me by once I install. I'm still debating going super cheap with Pyle amps so I won't care as much or moderate amps (possibly Rockford amps with their minimal profile and rail technology). Who knows....figuring it out is just as much fun.
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Old 01-19-2014, 12:48 PM   #24
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First things first, those are super clean, and look really nice!
I like the choice of the 4 inch speakers over the 5.25, I would say they wouldnt be needed since you have the 5.25s down below, and they are more just used to fill space. in addition to that, i think the 5.25 would have been a little too large for the area you used. SO again super cool, and the 4s were the right choice.

Tweeter mounts woulda been a sweet touch about the 4s though. haha I wish i had your skills to make those, or to do something like what the Daystar makes for the JKs to mount switches on the Pillars. If you ever decide to make and sell, let me know! hahaha

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