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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > AUDIO/VIDEO + BLUETOOTH + Electronics/Alarm/Software > Do It Right - Upgrade Your Logic 7 (Pics inside)



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      07-09-2008, 07:14 PM   #1
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Talking Do It Right - Upgrade Your Logic 7 (Pics inside)

First, let me start out by saying that I think the Logic 7 sound from 250 Hz and up sounds great for a stock sound system. It’s just that lower end that needs a little help. A little more power to the speakers under the seats, and a sealed sub with some good power to drive it is the answer.

So, first I tapped into the sub wires coming out of the stock amp, split the wires into 2 separate inputs (Sub & speakers under seats) and put them into an Audio Control LC6i line converter. This unit also has a sub gain control, which I mounted in the center console.

From there I went into one of the new digital amps from JL, an HD 600/4. I must say that these new HD amps from JL are very impressive! This amp that I picked will send 150W to the speakers under the seats, and 300W to the Sub. Speaking of the sub, I choose a JL 10W3v3, which I find to be very musical sounding in a small sealed enclosure.

Next was building the sealed enclosure (about .625 cu ft ) for the Sub … I choose a rear firing box and I decided to mount the equipment on the front of the box, so you can get at the stuff when you put the seats down.

Next was tuning the gains and x-over points between the subs and under seat speakers. I found bring the x-over point up a bit on the speakers under the seats made the transition between the Sub and seat speakers work best, and I could drive the seat speakers a little more with a higher x-over point.

Now the results ….. all I can say is ‘HOLY F’n CRAP!!’ This system sounds incredible!!! I wasn’t sure if I should add more power or replace the other drivers with Morel, or Dynaudio, or just keep them stock. Well boys and girls, no need for changing out all the drivers … just boost the low end of your system and you will be jumping for joy!!








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      07-09-2008, 07:17 PM   #2
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Wow...beautiful...beyond words...
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      07-09-2008, 07:18 PM   #3
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that is sweeeeeeeeet!
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      07-09-2008, 09:24 PM   #4
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wow nice install!
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      07-09-2008, 09:55 PM   #5
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Looks pretty clean. Nice job organizing the wiring btw. Enlcosure looks good as well. GL with the upgrade.
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      07-10-2008, 10:23 AM   #6
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It's too bad you guys can only see the install .... it's the sound that makes you go WOW!
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      07-10-2008, 06:58 PM   #7
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Nice Job!

I actually put the JL high output wedge with a W3 10 inch in my car as well (mated to a Slash 250/v2).

I was really happy the way it turned out. My driver is actually facing into the cabin through the ski hole.
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      07-10-2008, 07:24 PM   #8
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Very clean looking install
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      07-10-2008, 07:31 PM   #9
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NICE!! I remember rocking the Epicenter (Sp?) back in the day! Love Audio Control products and the JL gear is !!

Danny
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      07-10-2008, 10:07 PM   #10
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damn that is a rediculously clean setup... i would be interested if you made more !
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      07-12-2008, 01:47 PM   #11
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I just got back from a quick drive across town .... man, does this thing ROCK!
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      07-12-2008, 01:52 PM   #12
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I would LOVE to upgrade the system like you have done. Clean and simple, yet effective! But I need all the truck space for my family and I worry about stuff like this: http://www.e90post.com/forums/showthread.php?t=154153

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      07-12-2008, 01:53 PM   #13
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to be nosy, what was your estimated total cost?

also, just curious, but what is the tolerance between the amps and the rear seats? i wonder how bad the heat trap would get on a hot summer day while you were pushing the subs.

oh, and also, did you upgrade the speakers under the seats? or are they handling 150W without blowing?
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      07-12-2008, 02:04 PM   #14
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Quote:
Originally Posted by ubern00b View Post
to be nosy, what was your estimated total cost?

also, just curious, but what is the tolerance between the amps and the rear seats? i wonder how bad the heat trap would get on a hot summer day while you were pushing the subs.
Cost for equipment and materials was right around $1100.

No need to worry about heat ... that amp is the new D class digital amp from JL, and it's very efficient and doesn't get very hot. Plus I do have some ventilation and the amp is about 2 inches away from the seats.
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      07-13-2008, 08:31 AM   #15
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How does it sound? I really like clean bass that is not overly thumping. Any rattles?
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      07-13-2008, 12:46 PM   #16
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Quote:
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How does it sound? I really like clean bass that is not overly thumping. Any rattles?
It sounds great .... JL subs always sound tight in a sealed enclosure. No rattles .... it's just 1 ten inch sub.
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      07-14-2008, 03:07 AM   #17
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Man, this makes me miss the JL 10W7 later replaced by a 12W6V2 powered by a 500/1 I had in my old car .

Unfortunately I really need the ultility of my folding rear seats and now that the upcoming stealthbox is changing from its original side 10W6 design to a rear seat blocking twin 13W5 design I just took the plunge and ordered a 250/1 and a pair of earthquakes to help ease my basshead withdrawal symptoms.
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      08-03-2008, 01:27 PM   #18
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Nice install! I am wondering though as to why you used the LC6i when the JL amp can accept speaker level inputs? I am thinking about doing something similar so please let me know why you thought the LC6i was necessary.

Thanks!
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      08-05-2008, 09:49 PM   #19
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Is this custom fab'd or did you just buy an off-the-shelf enclosure?

Looks so clean, great work man I envy you
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      08-30-2008, 10:59 AM   #20
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would be great to know..

Quote:
Originally Posted by kaigoss69 View Post
Nice install! I am wondering though as to why you used the LC6i when the JL amp can accept speaker level inputs? I am thinking about doing something similar so please let me know why you thought the LC6i was necessary.

Thanks!
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      08-30-2008, 05:09 PM   #21
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WOW. Awesome install. I bet the sound is clean.
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      08-30-2008, 10:49 PM   #22
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Quote:
Originally Posted by kaigoss69 View Post
Nice install! I am wondering though as to why you used the LC6i when the JL amp can accept speaker level inputs? I am thinking about doing something similar so please let me know why you thought the LC6i was necessary.

Thanks!
It sounds better going into a true line level conditioner, and you have more control, plus it has a sub gain that you can mount up front. You can try going into just that amp, but if you care about sound quality, you won't be happy.
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