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Old Mon, Mar-18-2013, 12:32:59 AM   #1
Obioban
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Talking 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:



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):



Ignore the shock adjustment hole :P



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

Parts in a pile waiting to go in:



Stock electronics in the nav/cd changer harness:



And in the new, smaller bracket:



All the trunk mounted modules:



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



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



Bluetooth antenna on the friendly side of the metal wall



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:



Polk speaker in boom mat, being trimmed to fit:



Result:



And bolted down:



Stock HK out:



Wiring up the new tweeters:



Heat shrink:



Result:



Foamed up:



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



Floor modules in their final location:



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



Heat shrunk:



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



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



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



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



Levitating photoelectric license plate cover



Crossovers with wires bundled in factory fabric tape:



Wiring ugliness mid project:



Cleaned up and bundled:



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



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









update 10/2013

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



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

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!


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FS: Intravee and various compatible AI Net components.

Last edited by Obioban; Fri, Oct-11-2013 at 05:15:41 PM.
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Old Mon, Mar-18-2013, 02:04:28 AM   #2
M3Moogle
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Default 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.
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Old Mon, Mar-18-2013, 03:42:18 AM   #3
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Default Re: My highly unusual (weight/practicality focused) stereo project

No alpine amp here

OEM bluetooth before and after.
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Old Mon, Mar-18-2013, 03:54:26 AM   #4
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Default 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?
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Old Mon, Mar-18-2013, 03:57:01 AM   #5
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Default Re: My highly unusual (weight/practicality focused) stereo project

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Originally Posted by Project E46M3 View Post
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!
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Old Mon, Mar-18-2013, 05:26:37 PM   #6
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Default 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?
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Old Mon, Mar-18-2013, 08:06:18 PM   #7
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Default Re: My highly unusual (weight/practicality focused) stereo project

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Originally Posted by M3-3M View Post
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.
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Old Mon, Mar-18-2013, 09:43:10 PM   #8
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Default 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.
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Old Mon, Mar-18-2013, 09:48:44 PM   #9
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Default Re: My highly unusual (weight/practicality focused) stereo project

Quote:
Originally Posted by disapr View Post
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.
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Old Wed, Mar-20-2013, 10:55:25 PM   #10
Obioban
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Default Re: My highly unusual (weight/practicality focused) stereo project

Update: Sounds awesome .

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

Not even noticeable that there's no rear speakers
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