The best way to install a subwoofer into an E39?

Maljan

Active member
With an eye on a sound system upgrade, I have been pondering the idea of a subwoofer. The interwebs has lots of info but I now more than a little confused. What works? What is the easiest way? A bit of woodworking doesn't scare me. I have the machinery for that. But what wins and what pays?

You can do it the factory way, as the 540i came out:

BMW_E39_M5_subwoofers.jpg


But two little five inch drivers does not make a sub, in my book. And sourcing that big plastic box (made by Nokia BTW) could be a challenge.

The M5 came out with two ten inchers mounted like this:

done.jpg


Looks easy enough, but some cutting of holes in the body is involved. And there is a fancybracket between body and speaker. That can be duplicated with MDF, filing and patience I reckon.

1z0p.png


This seems to come in more than one flavor.

pict0018ak6.jpg


Not sure what the story is with the above picture. It comes from a German forum. Is it an OEM or aftermarket thing? Perhaps someone can fill in the details. I have not had the chance to peer into the bot af an M5 so I am clueless.

You can just go nuts and put a whole bunch of woofers in the door:

bmw-5-e39.jpg


Some guys do not want to lose any trunk space, so the sub goes on top of the spare wheel. Wagon owners like this:

cimg1404-21777.JPG


This involves molding fibreglass, or very fancy woodwork. Loss of trunk space is not a big deal for me.

If you have folding seats, just bolt the thing to backrest and call it good!

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The same idea, for non-folding seats. Also a bit more elegant:

01.jpg

02.jpg


The box can be bigger, but I guess in this case trunk space was a consideration.

If you never carry three people in the back, just ditch the armrest!,
ford-mondeo-kombi-mk3-obudowa-subwoofera.jpg


The picture shows a Ford Mondeo, but the plan will work in an E39 as well.

Here is the quick and dirty way. Pull off the factory trim, bolt on a plank with a sub, hook it up and you are good to go.

up18.JPG


Here is the same idea, but done in a neater way:

yvu8ajah.jpg


From a sound quality point of view, the best answer seems to be a great big box with the woofers facing backwards. The box vents into the car. This was suggested to me by a pro installer.

photo1.jpg

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The vent looks nice, but the box is not a very good fit. This is better:

BMW59703-2.jpg


If you are really handy, you mold a fibreglass box that replaces the battery cover. This is beyond my skill set.

DSC01680.jpg


Here is an aftermarket solution that is not on the market anymore. The box bolts to the bodywork and the woofer faces downwards:

bmw-e39-subwoofer-system.jpg


This looks like the easiest way to do it, from a DIY perspective.

Same would say - go big or go home!

m5subs.JPG


So, there you have it. Can any fellow fanatics share their experiences in this regard to assist me in making a choice?
:ty:
 

ChefDJ

///Member
Love the wheel-housing idea :thinking:


Mine is a simple aftermarket sub in the boot. Takes up minimal boot space, and the amp is mounted on top of the sub box. Then I had to tie it down to the top lining of the boot...
Torque made it topple over :mmm:


The OEM amp is a bitch to get out so I have both aftermarket and OEM amps running. My sound inside the cabin is pretty clear with plenty bass. Will show you how it was installed if ever you want to take a look.
 

WyKiD

Active member
Hey bud, great thread. I am also currently considering adding a sub to my E39 to enhance the rather weak oem setup.

I have not considered the more creative options, was thinking to just add a small box in the boot. Then to remove the plate in the ski hatch to allow the sound into the car. Also seen online there are 2 ports on the rear shelf that can be opened to allow sound into the cabin as well.

Have not physically taken a look in the boot as yet but was wanting to get to it this week.
 

ChefDJ

///Member
I didn't have to do any mod to allow sound into the car :dunno:

The boot isn't that well sealed from the cabin.
 

WyKiD

Active member
ChefDJ said:
Love the wheel-housing idea :thinking:


Mine is a simple aftermarket sub in the boot. Takes up minimal boot space, and the amp is mounted on top of the sub box. Then I had to tie it down to the top lining of the boot...
Torque made it topple over :mmm:


The OEM amp is a bitch to get out so I have both aftermarket and OEM amps running. My sound inside the cabin is pretty clear with plenty bass. Will show you how it was installed if ever you want to take a look.

You have the oem amp in the boot chef? You have the "high" oem sound setup? My car has the standard setup and no amp in the boot.

Have you had the ski hatch opened to let the sound in?

Any pics of your setup?

Would like to listen to your setup, you attending the Zambesi meet?


ChefDJ said:
I didn't have to do any mod to allow sound into the car :dunno:

The boot isn't that well sealed from the cabin.

Interesting, I have no personal experience here.

Should listen to your car.

Would actually prefer not to mess around with the car.
 

Maljan

Active member
Thanks for the inputs so far, guys. Here is a picture of how not to do it:

DSC0057.jpg


It works, I suppose. But those wires... :thumbdo:

Here are more views of the downwards firing sub box:

BSWSub6.jpg


SNV31321.jpg


SNV31327.jpg


It is (was) made by Bavarian Sound Works and came as a kit complete with amp to drive it. They are still around but it seems like they don't do E39 stuff anymore.
http://www.bavsound.com/
 

ChefDJ

///Member
My wires are mostly hidden, except for a slight view of the power cable on the one side but it's neatly tucked away. The rest of the cables are hidden underneath the boot carpet.

I made no adjustments to let sound into the cabin. Really, it's not needed.

I do have the standard OEM amp in the boot, behind the CD shuttle in the left compartment of the boot.

Will try my best to attend the meet at Zambezi but I cannot guarantee anything until the day itself. You're more than welcome to hop inside and turn up the radio :thumb:

No pics of the setup.
 

rodga

Well-known member
I'm busy installing a 10" in my e39 touring at the moment. Taking a bit longer than I would like, but I'm building a box to fit into the compartment above the battery. Trying to go for a completely stealth install without using any loading space and just add some low end to the system.

The amp will be hidden in the floor space between the back seat and spare wheel.

Being a 525i I also have the stock system, and it's hard finding out wiring stuff as most of the threads I found had the OEM amp setup. So I basically stripped the whole back of the interior except the roof lining just to find the wiring and plan the best route for the cables.

Also at the low frequency that subwoofer plays at you don't need to let the sound in really.

Sent from my SM-N900 using Tapatalk
 

Clownshoe

Active member
pict0018ak6.jpg


Same as mine in the 2002 M5 professional.

Ski hatch has to come out. If you have the arm rest bonus. On my E36 I got a arm rest back rest and replaced the material that usually covers the hole with a mesh so I could see the cone. No pics as it was pre-digital camera era.

Bavarian Sound Works set up looks sweet.
 

Fordkoppie

///Member
Maljan said:
This seems to come in more than one flavor.

pict0018ak6.jpg


Not sure what the story is with the above picture. It comes from a German forum. Is it an OEM or aftermarket thing? Perhaps someone can fill in the details. I have not had the chance to peer into the bot af an M5 so I am clueless.

My 2003 M5 has this setup.

Its part of its individual audio option (S752A). Sounds fantastic!!
 

Wizard$

New member
Hi Maljan

Seems you have done quite a bit of research - I was about to pull the trigger on a full BAvsound upgrade ex USA (they had awesome discounts), but then I was told they discontinued making the subwoofer unit. I think if you go with this design you should get good sound as they would have done extensive testing, but I think if I recall you need to cut bigger holes in the parcel shelve to let the sound in - check the youtube install videos.

I am leaning towards the custom moulded battery compartment, esp since in my M5 it just houses fuse box. I have the standard high sound package and it sucks! To make the upgrade easier I installed two RCA "receivers" directly into BM54 radio unit, so that I can get a good pre-out signal straight into an amp and then into speakers, bypassing the BMW amp completely. However I am still torn between maintaining OEM look, with limited good quality input sources, vs changing out entire system with double din unit.

Another point I just remembered, if you do go with the individual audio type setup, you need to make sure your subwoofers are free to air design for best results.

Good luck
 

Maljan

Active member
A line output converter (LOC) can be as simple as this:

RFI2SW_1_m.png


My guess is that there are four resistors making up two voltage dividers inside that black thingy in the middle. Easy to DIY.
 

rodga

Well-known member
Maljan said:
A line output converter (LOC) can be as simple as this:

RFI2SW_1_m.png


My guess is that there are four resistors making up two voltage dividers inside that black thingy in the middle. Easy to DIY.

Never seen one that small.
I'm looking at getting a 4 channel loc.


Sent from my SM-N900 using Tapatalk
 

Maljan

Active member
I have found this page with some very good info on the topic:

http://brazeauracing.com/540i/audio.html

For those who are too impatient to click on links, here are a few pics.

First off, build a custom sealed box out of 3/4" MDF with flush mount for 12" subwoofer. The box dimensions are: W=32", H=16", D1=5.5", D2=13"

stereo11.jpg

stereo13.jpg


Install a grille over the pass-thru hole (which you may need to cut out) to keep back kids of all ages from tampering with subwoofer.

stereo03.jpg


Use a foam sheet to seal the box to the pass-thru.

stereo16.jpg


With the box installed, there is plenty of room left.

stereo17.jpg


Quite a stealthy install. :coolShake:

stereo18.jpg


The thought of cutting holes into my car fills me with trepidation, although it is not as hectic as it looks. The thick brownish sound deading material behind the seat is perforated where the ski pass-thru would be. You just pop that out and trace a line inside of the sound deadinging to yourself cutting lines.
 

rodga

Well-known member
Maljan said:
rodga said:
Never seen one that small.
I'm looking at getting a 4 channel loc.

You will need two of them for four channels. It should be available locally. I found it on http://www.rockfordfosgate.co.za/

Heres a review from amazon on the above "converter"

These adapters simply adapt speaker wire to RCA jacks, they do not step down the signal from line/speaker level to a low level input needed for an amp. If you're looking for an actual line level converter these will not work, your sound will be very distorted. These would only be useful if used to plug into a line level converter that accepts only RCA jacks, you can't use these to go straight from speakers into an amp that needs low level inputs.
 
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