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Bavarian Soundwerks' Mobile Electronics Forum
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Old 07-23-2013, 12:09 AM   #1
DylanFulton7
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Question Fitting OEM Subwoofer With Standard System?

Looking for a little extra "umph" from my sound system. I have the standard system w/o the rear subs. I'm able to get my hands on a set of OEM subs for a very good price from a scrap yard and like the idea of still having my whole trunk without a sub box. Anyway what should I grab from the scrap car along with the subs? I'm not much of wiring guru so how would I go about doing this install into my car? It's a 2000 328Ci...
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Old 07-23-2013, 01:06 AM   #2
Megalocnus
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What subs are you talking about? Those from a HK system?
If this is the case, I don't think this is a very good idea. The OE speakers, HK or not, don't sound great even when new, and they don't age well. If you buy used E46 speakers, don't expect much from them. You'll be better off fitting new aftermarket speakers.
Get some decent quality speakers of matching size and impedance, and call it a day.
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Old 07-23-2013, 01:51 AM   #3
scottjoh
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Fitting OEM Subwoofer With Standard System?

I have looked into that possibility and get the speakers of course from the same body style car that you have. The coupe and sedan speakers are different and won't bolt on. Get the mounting screws, plastic expanding anchors if you can get them out, if not they can be purchased for not much money from the dealer. Be sure to get a good length of the wiring harness that connects to the subs amplifier and get the wiring harness to the other woofer if it's a sedan.

The tricky part is that the sub amplifier gets it's audio signal from the HK amp. The non-HK main amp does not have the summing network so the amp will need to be modified and a small circuit board added and wired in. I currently have the board designed and it's sitting on my hard drive waiting to go out for fab (one of many projects waiting). When I find a enough spare room on a pcb panel I'll put it on and get a few built, but, the last few panels have been totally filled. When I get around to it I will create a web site to show how to do it. In the mean time there is another mod to get more bass out of the stock 10-speaker system. The original amp has a high pass filter on the input that limits how low the speakers go. I forget what the x-over frequency was and the slope, but, I thought it was too high. I think I already have a web page up for that mod. Better quality front woofers are recommended. I put in Boston Acoustic PRO65 woofers and tweeters and modified the amp again to bring down the gain of the tweeter and move the x-over point down.


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Old 07-23-2013, 06:53 AM   #4
NyC35AV
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Quote:
Originally Posted by scottjoh View Post
I have looked into that possibility and get the speakers of course from the same body style car that you have. The coupe and sedan speakers are different and won't bolt on. Get the mounting screws, plastic expanding anchors if you can get them out, if not they can be purchased for not much money from the dealer. Be sure to get a good length of the wiring harness that connects to the subs amplifier and get the wiring harness to the other woofer if it's a sedan.

The tricky part is that the sub amplifier gets it's audio signal from the HK amp. The non-HK main amp does not have the summing network so the amp will need to be modified and a small circuit board added and wired in. I currently have the board designed and it's sitting on my hard drive waiting to go out for fab (one of many projects waiting). When I find a enough spare room on a pcb panel I'll put it on and get a few built, but, the last few panels have been totally filled. When I get around to it I will create a web site to show how to do it. In the mean time there is another mod to get more bass out of the stock 10-speaker system. The original amp has a high pass filter on the input that limits how low the speakers go. I forget what the x-over frequency was and the slope, but, I thought it was too high. I think I already have a web page up for that mod. Better quality front woofers are recommended. I put in Boston Acoustic PRO65 woofers and tweeters and modified the amp again to bring down the gain of the tweeter and move the x-over point down.


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Wow this is good info, any links to the page to modify the high pass filter?
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Old 07-24-2013, 12:19 AM   #5
Andy2108
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DylanFulton7, that HK sub is incredibly uselessness. It would be a complete and total waste of your time to try to fit one to your car. Just get a very small sub and amp... used if possible. A 100 watt 8" sub will sound a million times better, and be louder, than the stock HK sub.
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Old 07-24-2013, 01:06 PM   #6
DylanFulton7
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Fitting OEM Subwoofer With Standard System?

I was tempted to make the move but when I tested it out the speaker crackled horribly. I'll just keep an out for sales on some speakers.


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