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      12-01-2014, 05:47 PM   #1
VP Electricity
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2014 F82 M4 Audio Upgrade

Here's a minimally-invasive high-performance audio upgrade in a new M4 coupe. This client has used us before - we did a very high-performance sound system in his E90 M3, as well as radar/laser systems in a number of vehicles. The HK just wasn't sufficient for him - the greater power with the HK in the F cars made the system louder than previous HK systems, but it didn't sound good enough. That said, he still wanted a reversible, invisible upgrade which didn't compromise the value of his new M4.

This build also features the very first F32/F82 OE-Look Subwoofer Enclosure off of our new tooling.





We used the Mobridge of Australia DA2 D/A Converter in place of the stock HK amplifier. We were pleased to find that Mobridge has now sorted out the front and rear PDC alert tones and that they are properly routed. The vehicle is not yet listed as supported on Mobridge's web site, but it might be by the time you read this. We had inside guidance that we would be OK on this project

The output of the DA2 was routed to the Mosconi of Italy 6to8DSP. We ran front and rear out of that high-passed, and then mixed front and rear 50/50 to derive the underseat midbass and subwoofer feeds. The client likes rear speakers, so we wanted to ensure the bass didn't go away when the fader was used a bit in one direction or the other.



The rear speakers were left stock, since we had dedicated EQ channels for them. We used quite a bit of delay on the rears to "enlarge" the sense of the cabin's size (early reflections in a car are always too short a time to be heard as actual reflections - they sound like tonal shifts. Longer reflections require greater distances than can be acheived in a cabin).

The Arc Audio KS125.4 Mini 4-channel powered the fronts and the underseats. The KS125.2 powered the rears, and the 500.1 powered the sub. These amps were definitely the right shape to make this installation work:







The equipment bay is protected by a new subfloor which holds the BMW Mobility Kit compressor and supplies:



We upgraded the front components to the Dynaudio Esotar E430 midrange and the Esotec MD102 tweeter. We didn't go fully-active - the client wasn't prepared to have new wire into the doors, and he didn't want to pay for that many channels on this car (the E90 M3, which he still has, is a 10-channel active system). We used the Esotec passive, which Dynaudio advises is appropriate for the E430 midrange.









The underseats were our stalwart Jehnert XE200 midbass speaker, band-passed.

The trunk sub was the Morel Ultimo SC carbon-fiber-cone 10-inch model.



The sub amp control knob went in the dash storage pocket:



After adjusting the time delay, the crossovers, and the levels, there was little EQ needed - mostly to make the left and right speakers match as closely as possible for the best imaging. The rears aren't noticed as a source of sound, which is as it should be, and the bass is solid and tangible up front.
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      12-01-2014, 08:04 PM   #2
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WOW that is some shit... high quality install there, good job and thank you for sharing
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      12-02-2014, 12:58 AM   #3
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wow. Awesome stuff.

How much does something like this cost?
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      12-04-2014, 02:32 PM   #4
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Stunning!
Is access to the battery still ok? Isn't it behind/under the sub in the back?
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      12-04-2014, 03:35 PM   #5
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Nice
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      12-04-2014, 04:45 PM   #6
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That's some quality work right there. Nicely done
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      12-04-2014, 04:47 PM   #7
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Oh, and if you wouldn't mind responding to my email, I sent you an email about add a sub, got your response, and sent a response back, really interested in you guys.

Dave
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      12-05-2014, 07:58 AM   #8
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Very nice. Clean install!
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      12-05-2014, 07:10 PM   #9
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Quote:
Originally Posted by Steveo View Post
Stunning!
Is access to the battery still ok? Isn't it behind/under the sub in the back?
Sub comes out in 20 seconds. No problem!
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      12-05-2014, 07:11 PM   #10
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Quote:
Originally Posted by Dave 90TT View Post
Oh, and if you wouldn't mind responding to my email, I sent you an email about add a sub, got your response, and sent a response back, really interested in you guys.

Dave
Working through the inbox again later tonight!
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      12-05-2014, 07:15 PM   #11
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Super clean install. Thanks for sharing.
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      12-05-2014, 10:40 PM   #12
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Quote:
Originally Posted by VP Electricity View Post
Working through the inbox again later tonight!
No sweat, got it. Really appreciate the thoroughness and responsiveness of you guys, as well as the professional work. Will be buying from you

Dave
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      04-02-2015, 11:34 AM   #13
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awesome install, fabulous work, with amazing DYNAUDIO speaker, i bet sound out of this world. thank for your time.
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      04-02-2015, 09:15 PM   #14
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I've done quite a few systems, and this install is very clean and doesnt waste space. great job on the install and fabrication. Is there a price for this sub box? I was going to build my own but if this is a reasonable price I rather buy this.
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      04-02-2015, 10:39 PM   #15
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Quote:
Originally Posted by tonydt1g3r View Post
I've done quite a few systems, and this install is very clean and doesnt waste space. great job on the install and fabrication. Is there a price for this sub box? I was going to build my own but if this is a reasonable price I rather buy this.
If only they had a website which listed their prices
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      04-03-2015, 03:52 PM   #16
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Anyone know in Raleigh who could as good of work as above and is proven on bmw?
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