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-   -   My highly unusual (weight/practicality focused) stereo project (http://www.m3forum.net/m3forum/showthread.php?t=438228)

Obioban Mon, Mar-18-2013 12:32:59 AM

My highly unusual (weight/practicality focused) stereo project
 
Unlike most stereo projects, the focus of mine was not particularly to improve sound quality (though that should be a nice perk of it). My goals were as follows:
1) Increase trunk space
2) Reduce the total weight of the car
3) lower the COG
4) recover some 50/50 weight distribution

To do this, I did a number of things...
-I cut the total number of speakers in the car from 12 to 7 (removed all rear speakers and HK subs)
-I used lighter speakers than stock in each application (used polk speakers, which use rare earth magnets for the same pull strength at less weight)
-I relocated all of the heavier electronics to the far back of the trunk floor
-I switched to the non nav/cd changer trunk liner
-I switched from the dual HK subs to a single 8" free air sub in a stealth box
-I added an Alpine PXA-H100 sound processor, which the intravee tricks the nav into thinking is an OEM DSP sound processor for full control through the factory MKIV UI
-light weight amps (2.7 lbs each)

Hard to explain with words. Here's some pics. Starting with the cliff notes,
Before (sadly I forgot to take a pic before I pulled the trunk liner or of the HK subs in the center middle of the trunk:

http://www.lindvigs.com/obioban/stereo/IMG_4772.jpeg

After (note that while the stealthbox is larger than the OE HK box, it's in a useless spot above the shock tower instead of dead center in the most useful spot in the trunk):

http://www.lindvigs.com/obioban/stereo/IMG_0165.jpeg

Ignore the shock adjustment hole :P

http://www.lindvigs.com/obioban/stereo/IMG_0166.jpeg

And now for some pics of the process along the way...

Parts in a pile waiting to go in:

http://www.lindvigs.com/obioban/stereo/IMG_4774.jpeg

Stock electronics in the nav/cd changer harness:

http://www.lindvigs.com/obioban/stereo/IMG_4773.jpeg

And in the new, smaller bracket:

http://www.lindvigs.com/obioban/stereo/IMG_4776.jpeg

All the trunk mounted modules:

http://www.lindvigs.com/obioban/stereo/IMG_4782.jpeg

Intravee breakout box on top of Alpine HD radio on top of OEM bluetooth:

http://www.lindvigs.com/obioban/stereo/IMG_4784.jpeg

Intravee on top, with the serial port left open for future firmware updates :D

http://www.lindvigs.com/obioban/stereo/IMG_4786.jpeg

Bluetooth antenna on the friendly side of the metal wall :roll:

http://www.lindvigs.com/obioban/stereo/IMG_4788.jpeg

Trimmed down the door to fit the new, deeper, 6.5" Polk speaker and padded the borders to keep rattles at bay and make a nice seal:

http://www.lindvigs.com/obioban/stereo/IMG_4789.jpeg

Polk speaker in boom mat, being trimmed to fit:

http://www.lindvigs.com/obioban/stereo/IMG_4799.jpeg

Result:

http://www.lindvigs.com/obioban/stereo/IMG_4805.jpeg

And bolted down:

http://www.lindvigs.com/obioban/stereo/IMG_4793.jpeg

Stock HK out:

http://www.lindvigs.com/obioban/stereo/IMG_4800.jpeg

Wiring up the new tweeters:

http://www.lindvigs.com/obioban/stereo/IMG_4829.jpeg

Heat shrink:

http://www.lindvigs.com/obioban/stereo/IMG_4814.jpeg

Result:

http://www.lindvigs.com/obioban/stereo/IMG_4816.jpeg

Foamed up:

http://www.lindvigs.com/obioban/stereo/IMG_4834.jpeg

Added a plug to make the doors easy to install/remove in the future:

http://www.lindvigs.com/obioban/stereo/IMG_4836.jpeg

Floor modules in their final location:

http://www.lindvigs.com/obioban/stereo/IMG_4857.jpeg

Whipping up a wiring harness to extend the nav plugs so they can be mounted under the trunk floor:

http://www.lindvigs.com/obioban/stereo/IMG_4840.jpeg

Heat shrunk:

http://www.lindvigs.com/obioban/stereo/IMG_4841.jpeg

Had to dremel the top and bottom of the plastic off the DVD drive to make it fit under the trunk floor:

http://www.lindvigs.com/obioban/stereo/IMG_4777.jpeg

Was amused to notice that the MKIV display is made by alpine. All alpine system :D

http://www.lindvigs.com/obioban/stereo/IMG_0148.jpeg

While the car away apart, took out the center console buttons and mailed them to terra to have the seat heater temps turned up. Always annoyed that they weren't warmer, like non M e46s :banghead:

http://www.lindvigs.com/obioban/stereo/IMG_0149.jpeg

Used to have fairly heavy speakers mounted on the center of the headliner for the CB and scanner. Now using light weight speakers behind the rear door cards instead. Reduced weight, lowered COG, and better back seat head room :D

http://www.lindvigs.com/obioban/stereo/IMG_0154.jpeg

Levitating photoelectric license plate cover :roll:

http://www.lindvigs.com/obioban/stereo/IMG_4844.jpeg

Crossovers with wires bundled in factory fabric tape:

http://www.lindvigs.com/obioban/stereo/IMG_4860.jpeg

Wiring ugliness mid project:

http://www.lindvigs.com/obioban/stereo/IMG_4858.jpeg

Cleaned up and bundled:

http://www.lindvigs.com/obioban/stereo/IMG_0001.jpg

Noticed the right side of my brake pedal is wearing out. Too much heel toe :raspberry:

http://www.lindvigs.com/obioban/stereo/IMG_4849.jpeg

edit: forgot to include pics of the OEM DSP interface running!

http://www.lindvigs.com/obioban/stereo/IMG_0168.jpeg

http://www.lindvigs.com/obioban/stereo/IMG_0169.jpeg

http://www.lindvigs.com/obioban/stereo/IMG_0170.jpeg



update 10/2013

So, the CSL thread inspired me to get off my ass and finish this project. I changed to this sub:

http://www.pioneerelectronics.com/St...ront_large.jpg

Which only weights 4 lbs.

To get it to fit into the stealthbox housing, I had to grind ~.5cm of metal off the outside of the speaker, ~.5cm of material off the inside of the stealthbox, and make new mounting holes inside the stealthbox, but it all worked out.

Amazingly, it actually make more bass than my previous setup :clueless:

Expected this to be a 1 hour project, ended up being more like a 6 hour project. Still, car is lighter, so I can't complain!


http://i1010.photobucket.com/albums/...ps91f959db.jpg

M3Moogle Mon, Mar-18-2013 02:04:28 AM

Re: My highly unusual (weight/practicality focused) stereo project
 
Love the amount of thought and work put into all this. I have the same alpine amp sitting my closet collecting dust. Did you have any kind of bluetooth before hooking up all the speakers?

I find that the sound over bluetooth is actually pretty good and actually brings out in whatever is in those hk speakers.

Obioban Mon, Mar-18-2013 03:42:18 AM

Re: My highly unusual (weight/practicality focused) stereo project
 
No alpine amp here :shifty:

OEM bluetooth before and after.

Project E46M3 Mon, Mar-18-2013 03:54:26 AM

Re: My highly unusual (weight/practicality focused) stereo project
 
Where did you get the new mounting bracket for the amp for non-nav carpet trim?

Obioban Mon, Mar-18-2013 03:57:01 AM

Re: My highly unusual (weight/practicality focused) stereo project
 
Quote:

Originally Posted by Project E46M3 (Post 1066047581)
Where did you get the new mounting bracket for the amp for non-nav carpet trim?

totaled car... but I would think you should be able to get one at the dealer? OEM part!

M3-3M Mon, Mar-18-2013 05:26:37 PM

Re: My highly unusual (weight/practicality focused) stereo project
 
Nice Ian! So how does it sound? John, Steph and Richard all have me thinking about those RF amps. Is that Richard's break out box or did you make it?

Obioban Mon, Mar-18-2013 08:06:18 PM

Re: My highly unusual (weight/practicality focused) stereo project
 
Quote:

Originally Posted by M3-3M (Post 1066048240)
Nice Ian! So how does it sound? John, Steph and Richard all have me thinking about those RF amps. Is that Richard's break out box or did you make it?

Richard's box.

I won't be hearing it to weds... hopefully weds.

disapr Mon, Mar-18-2013 09:43:10 PM

Re: My highly unusual (weight/practicality focused) stereo project
 
Any info on your plate cover? I've seen a few and it's in my 'need to look into' folder.

Obioban Mon, Mar-18-2013 09:48:44 PM

Re: My highly unusual (weight/practicality focused) stereo project
 
Quote:

Originally Posted by disapr (Post 1066048689)
Any info on your plate cover? I've seen a few and it's in my 'need to look into' folder.

http://www.ebay.com/itm/261051736771...84.m1439.l2649

http://www.youtube.com/watch?feature...&v=l02_uQCs05c

I'll be controlling it with the former HK console button.

Obioban Wed, Mar-20-2013 10:55:25 PM

Re: My highly unusual (weight/practicality focused) stereo project
 
Update: Sounds awesome :D.

Significantly better than stock HK. Certainly no booming bass, but there is a base range, unlike stock, which is exactly what I was going for. Now I can hear the entire song :roll:

Not even noticeable that there's no rear speakers :)


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