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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 04-13-2013, 03:43 PM   #1
jorgeownz
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How do you hook up an amp and a subwoofer

I have a factory unit and all i really want is to add a 10' kicker but i have no idea on how to hook up the amp to make this happen, is it possible to add an amp and a sub woofer to a factory bmw sound system? my car is an 05.
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Old 04-13-2013, 04:01 PM   #2
Kris323i
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Yes you need a low to high level converter hooked to the factory amp wiring harness. 20 bucks at autozone. I just did this works great go to soundwerks for wiring to factory harness.
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Old 04-13-2013, 04:47 PM   #3
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Yup just make sure you grab the signal from a wire before it reaches the stock amp.
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Old 04-13-2013, 05:33 PM   #4
jorgeownz
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Where is the stock amp?!?!?!?

and any DIY'S out there for me to check out?

Last edited by jorgeownz; 04-13-2013 at 05:40 PM.
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Old 04-13-2013, 08:23 PM   #5
scottjoh
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The stock amp is the trunk on the left side behind the trunk liner. It's below the CD changer is you have one.
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Old 04-13-2013, 08:31 PM   #6
HiHoBrian
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BSW has a decent install diy. I think it is a PDF. It will tell you what wires are the low level inputs and the amp signal wire.

Edit: click on install info to download the PDF. It is an excellent DIY!


http://www.bavariansoundwerks.com/pr...-Series-Sedan/
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Old 04-13-2013, 08:39 PM   #7
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dont listen to these fuQ faces... just go to a junk yard and get a used complete left rear end. i cracked my left rear control arm on the highway because i was driving w/o shocks... lol! ***Was too busy caking on these bitches instead of taking care my car!***
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Old 04-13-2013, 09:25 PM   #8
IrunBimmer
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Buy custom amp and custom subs; don't be cheap your a BMW owner act like one. Make the system sound good; not like crap
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Old 04-14-2013, 01:19 AM   #9
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Buy custom amp and custom subs; don't be cheap your a BMW owner act like one. Make the system sound good; not like crap
BMW is cheap on sound systems, lol.
It makes sense though - you either drive the car or you listen to music. Can't do both at the same time.
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Old 04-14-2013, 01:50 AM   #10
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sure you can do both at the same time.

anyways, to the guy who started the thread. no matter how much you spend on a high low pass, or Line out converter as they're called, you will never do your system justice. it can be a temporary thing but I can guarantee that as soon as you hook that sub up the correct way, with rca outputs, it will sound so much better. not a little bit, but a lot. i actually thought the system sounded good, the bass hitting hard when I used the line out converter. when i installed aftermarket head unit, i finally realized how crappy it was. huge difference. the bass is now cleaner, hits even harder, and is the only way to everntually go.
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Old 04-14-2013, 02:59 PM   #11
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so I can trash the factory amp when I get an aftermarket head unit?

and subsequently, run the factory speakers powered just by the head unit and subwoofers off a mono amp?
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Old 04-14-2013, 03:10 PM   #12
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so I can trash the factory amp when I get an aftermarket head unit?

and subsequently, run the factory speakers powered just by the head unit and subwoofers off a mono amp?
Remove the. Stock unit put in a pioneer or smthing wire that to an amp and sub in your trunk and don't touch anything else your speakers will be connects to the unit don't think about it to much it's not hard
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Old 04-14-2013, 07:19 PM   #13
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Hm..... I don't think it works that way nor is it that simple and of course you have to think about it
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Last edited by NumbaOneNewb; 04-14-2013 at 07:26 PM.
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Old 04-14-2013, 07:24 PM   #14
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This is what you do If you dont plan on running an amp for your door speakers Upon getting aftermarket head unit, install it. Now, for the most part, since I did use an amp for door speakers, i didn't connect any of the speaker wires in the back. For you, you will need to hook all the wires up pretty much back there. Then, you need to go to the amp in the back, the stock amp that us, and disconnect the harness to it. It'll split into 2 separate connectors. Now bmw didn't make it simple where one harness was for inputs the other outputs. It's all mixed and criss crossed. So you'll need to find all the door speaker wires that are headed towards the stock amp and use whatever method you want to have it connect directly over to the wire heading out to that speaker. You want to skip over that stock amp.

I'd also leave that connector disconnected because it will no longer be of any use. You can also tap into the white wire back there to get the remote wire for your sub amp instead of running one from the front. It's already there for you.

This method will at least give you the best sound your equipment was capable of producing. If you dont plan on switching the door speakers, expect the quality to fall below stock standards. The speakers in there are of the most unusual ohms, and nothing aftermarket that's worth the money have that type of ohms. No head unit or amp is compatible with those specs. Switching out your door speakers will then provide compatible sound
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Old 04-14-2013, 07:34 PM   #15
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Hm..... I don't think it works that way nor is it that simple and of course you have to think about it
Iv don't this on 4bmws and counting its simple. Study the diagram and you will be good.
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Old 04-14-2013, 07:39 PM   #16
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Oh brother. Those 4 bmws must sound horrible because it just would. Ask any stereo expert this. Don't ask me. I already know My mmethod is the acceptable one, the right way to do it.
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Old 04-14-2013, 07:42 PM   #17
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Well, as for the OP, do what you want. I'd recommend searching this subject like you should have and you would know the correct way to hook up a stereo in a bmw
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Old 04-14-2013, 07:46 PM   #18
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One more thing. Don't buy any of that bsw crap they sell. Installation may somewhat plug and play but way over priced. It'd probably cost you the same to buy decent speakers and pay someone to install it for you. Their setup is also for those guys who want a better than stock sound system but don't want to switch head unit out. It's like the stock head unit is a piece of gold or something. That thing is just pure crap
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Old 04-14-2013, 08:02 PM   #19
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One more thing. Don't buy any of that bsw crap they sell. Installation may somewhat plug and play but way over priced. It'd probably cost you the same to buy decent speakers and pay someone to install it for you. Their setup is also for those guys who want a better than stock sound system but don't want to switch head unit out. It's like the stock head unit is a piece of gold or something. That thing is just pure crap
So Newb, what kind of speakers would you install in the rear deck? I have the base system with no subs. Would you buy mid-range speakers?
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Old 04-14-2013, 08:17 PM   #20
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I don't think BSW sells crap. They sell speakers and convenience. It takes actual research and tinkering around to install aftermarket speakers/amp into our cars. Their system is simply plug and play. Took me a total of about 8 hours. I installed an alpine processor which allows me to keep the stock head unit. I then used the factory speaker wiring to connect aftermarket speakers and amps. Had to cut holes into the speaker door sheet metal and fabricate custom mounting brackets. Are my aftermarket speakers better than what BSW offers ? I would wager yes but i did lots of research and chose to go with high quality, but less durable speakers that are marketed for the home.
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