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Old 03-17-2018, 10:16 PM
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Alpine 9 speaker upgrade Speaker Sizes?

Hi,

I was hoping someone here would know the speaker sizes for the Alpine 9 speaker upgrade from factory for our JK/JKUs. I am considering changing them out for better quality speakers as I recently changed my head unit to one that produces great sound quality and good RMS power. When I turn it up to a slightly higher than moderate level I am hearing some distortion in the speakers.

I know the 9 speaker setup is the best setup stock from any Wrangler but I feel it's lacking in a few areas and would like to replace the speakers. My budget won't allow for me to do it all at once, but i'd like to replace the front dash/front lower and sound bar speakers first and down the line, replace the sub. Anyone know the size of the speakers? Thanks in advance.

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Old 03-18-2018, 12:50 AM   #2
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If you are talking about 2015 and newer, you won't find an aftermarket sub that is a "drop in" for the one in the 9 speaker Alpine system. Upper dash speakers are 3.5" (but a typical component tweeter can be placed there with a home made adapter), lower dash speakers are 6.5", with a matching pair in the sound bar on each side.

Keep in mind, aftermarket speakers and subwoofers will likely need much more power than the OEM Alpine amp provides. They'll also need more than even the most powerful head unit provides from the built-in I/C amp.

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Old 03-18-2018, 07:58 AM   #3
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Assuming your Wrangler is a 2015 or newer, you need to do some searching and reading on this forum before messing with your Alpine speakers - it is a pretty good system (gets high owner reviews), but the amp and speakers are special (odd impediances, multi-channel subwoofer, etc) and you can't easily just replace them with standard stuff. Here is one thread you can start with:

https://www.wranglerforum.com/f274/al...t-2054393.html

In that thread, be sure to watch the video linked in post #6 for details of the design of the Alpine system.

Good luck on your upgrade.
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Old 03-18-2018, 04:44 PM
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@basicxj , thank you for the speaker sizes. I don't intend on using the factory amp, I want to bypass it with a 5 channel, Alpine PDX amp. Again, there is nothing terrible about the factory alpine setup but it's lacking in many areas and now that I have a quality head unit, the distortion on the stock speakers is pretty bad at a good, clean volume. I need something with more RMS power for my tastes but then the sub that is lacking will be drowned out so I am trying to figure out a good 10'' Sub options, even an 8'' quality sub would work but It doesn't look like anything but a specific Kenwood sub will fit under my front seats of a 2dr JK.
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Old 03-18-2018, 04:59 PM   #5
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If you want to run a dedicated subwoofer enclosure in the rear cargo area, there are many good choices depending on whether you want SPL or more towards SQ.

I assume you have this one?

https://www.crutchfield.com/S-9bq9st...ine-PDX-5.html

300 watts RMS to the sub isn't a lot, but there are subs that will work with that amount.

These are potent woofers in 8" or 10" that don't need too much power:

Subs - SHOP BY BRAND - Sundown Audio - E Series - SSA STORE

They'll sound good sealed, produce more bass ported.
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Old 03-18-2018, 05:49 PM
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@basicxj ,

I used to have that amp years ago, I will get one of the newer X series 5 channel Amps. I am thinking about going with a single 12'' in the rear cargo area. Do you perceive any issues removing the factory, All Weather Sub and either putting a single 12'' or 2 10'' Subs back there in a custom box on the floor?
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Old 03-18-2018, 08:11 PM   #7
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Quote:
Originally Posted by LoKdUp View Post
@basicxj ,

I used to have that amp years ago, I will get one of the newer X series 5 channel Amps. I am thinking about going with a single 12'' in the rear cargo area. Do you perceive any issues removing the factory, All Weather Sub and either putting a single 12'' or 2 10'' Subs back there in a custom box on the floor?
There isn't much depth in the floor (which is why Alpine designed what they did which uses very little space).

There are three factors in a subwoofer which allow it to produce decent amounts of meaningful, hard-hitting bass- cone area, motor strength, and excursion capability. There won't be aftermarket solutions which will fit under a seat or fit in the cargo floor cubby that will exceed the performance of the OEM upgraded Alpine sub without spending an awful lot of money and using a very thin-walled fiberglass enclosure with gobs of power behind it (necessary to compensate for the small enclosure, the lack of cone area and lack of depth which will affect excursion). If you want more than that, then it will likely mean using a traditional enclosure mounted inside the cargo area. That doesn't mean it will take a lot of room though- a pair of those Sundown 8"s will perform in a pretty small enclosure, but they are deep little suckers. Port that enclosure and build it to spec, and a pair of those 8s will put out.

http://www.youtube.com/watch?v=rQm35pMnrlg
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Old 03-19-2018, 12:43 AM   #8
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Quote:
Originally Posted by LoKdUp View Post
@basicxj ,

I used to have that amp years ago, I will get one of the newer X series 5 channel Amps. I am thinking about going with a single 12'' in the rear cargo area. Do you perceive any issues removing the factory, All Weather Sub and either putting a single 12'' or 2 10'' Subs back there in a custom box on the floor?
As long as you are adding your own amp, and abandoning the factory amp, speakers, and sub, the only issue you should have is space. You can design a custom sub box with no problem as long as you are willing to give up the storage space in the cargo area. You could also make the sub box removable for times you need the space for something else.

I was lucky that my Wrangler only had the base sound system when I got it, so I wasn't having to scrap components worth much when I upgraded my system (touchscreen Kenwood head unit, backup cam, 4 new woofers and component hard dome tweets). In your case, you should be able to get a pretty good chunk of money for all the Alpine stuff you pull out - it will be quite desirable to some.

About fitting components under the front seats: you have probably already figured out that the front seats in the 2-door JKs are different than the 4-door JKUs, and that there is hardly any room under the 2-door front seats. So while you may be able to fit amps or subs under a JKU's front seats, you are quite limited with what you can fit under there on your 2-door JK.

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