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BMW 645ci bandpass enclosure


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Ok so I've owned this 645ci since November.  Primarily taking her out on the weekends.  She has the Logic 7 upgraded system which includes 2 slim subs behind the seats firing into the cabin.  The bass is surprising but it's faint and lacks the oomph that I am used to.  I told myself I would not touch this car but I am starting to change my mind. 

I emailed JL Audio about bandpass specs for the 10W3V3-2 subs I have.  

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They replied the following day with these specs which now I can't find but I remember what they were:

"1.3 sealed, 1.7 ported, 25 ci port area, 10" long port.  Will play down to 35 hz". Just can't recall the upper portion of the bandpass. 

I tried last month to draw out the enclosure on graphing paper a few times.  These damn subs were about 30-35mm taller than the 10" Round Solobarics I have. SMH.  The height difference made it difficult to angle the subs in a 3cf enclosure.  Last night I tried again for about 3 hrs, drawing the gragh again and again.  The only way to make them fit would be to scoop out areas where the sub would hit the wall.  Yes it may weaken the enclosure but I know those prefab Ram truck enclosures have small thin panels so it worked!

So went Home Depot. They were out of 3/4" Birch! So I used Sande wood instead.  It's what I used in the 328i.  

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Slowly started coming together.

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I needed about 3/8" clearance for the 10.5" sub surround to clear the top and bottom of the enclosure so I had to route out the base to lower the subs!

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Coming together.

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I couldn't build the enclosure without testing and retesting where the subs would hit parts of the enclosure. Very time consuming.

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Pretty tight clearances once mounted. 

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Had to scoop out a lot to clear the magnet.  I have a 2x4 area where I have about 1/4" under the magnet.

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Had to clear the front surround as well as behind the baffle because the stamped basket was also touching the bottom of the enclosure. Like I said, tight clearances!

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Well, I guess any suitcases will have to sit in the back seat!

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Tomorrow I finish the top and front.  

The port will fire into the cabin via the ski port which is about 8.5" of distance.  So most of the port will not be in the enclosure.

I'm going to have to install the box then go inside the car to install the port.  

-Frank

 

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Cool little project, tuned in

Nav-TV Zen V Audio Interface

AudioControl DM-608

(2) Stevens Audio Neo-Comp Full-Size Horns

(4) Faital Pro 6PR160 6.5"

AudioControl LC-6.1200

(1) Fi Neo 4.7 15" D2 in 3.74 Cubic Feet @ 27.70 Hz

Ampere Audio AA3800.1

Odyssey ODP-AGM48 Battery (Starting)

Odyssey ODX-AGM31 Battery (Trunk)

Big 3 - 2\0 Welding Cable, KnuKonceptz Speaker Wire & 1/0 Power Cable, NVX RCAs, Second Skin (Speaker Tweaker Pads, Damplifier Pro Mat), Diode Dynamics LEDs

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Wow, nice Frank nice!

2007 Chevy Tahoe (SOLD)

12 ~ FI Audio X series 10" w/BP option

2 ~ DC Audio 5.0K @0.67

3 ~ DC Audio 5.0K @1.0 

2 ~ PPI 3 way sets (not installed yet)

1 ~ RF T400-4, 1 ~ RF T600-2, 1 ~ RF T600-4

4 ~ CT Sounds 5.25" Strato comps  (rear fill only)

1 ~ XS Power D4800

1 ~ XS Power D3400

8 ~ XS Power XP3000

160 stock alt, Mechman 370 Elite, 185 DC Power

320+ Sq. Ft. Sound Deadener

Pioneer AVH-X5500BHS

Youtube: https://www.youtube.com/user/knfjdkghjudfhsgkjdhf/videos?sort=dd&view=0&shelf_id=0

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Thanks Karkov.  I was so having bass in my vehicles since I was 21. It's hard not to!

The Crossfire VR1000D started to smoke when I was up in NYC back in March. It was cold outside, I went to crank up my car and saw a spark coming from the ski port, then smoke. 

So I've been driving around with no bassy-bass since March. Something had to give. lol.

-Frank

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