VX car audio redesign & system build

[biju]

PART I

I just finished the car audio redesign & system build in my Dragon and thought I’d share the results with anybody who's interested...

My mission? I set out for more power, a better front stage, and low end that had the capability to produce both ground shaking deep bass yet sound quality (SQ) on demand. Finally, I wanted this to be presented as cleanly as possible (granted my novice skill set with car audio fabrication, etc.).

My old set-up included the following:

Alpine CDA-9835
Boston Acoustic Pro 6.5 (Front)
Boston Acoustic Pro 5.5 (Rear)
Precision Power A404
Precision Power A600
10” Kicker Solobaric

If you take a peek at my gallery you can see this old set-up. For the new configuration I added the following components:

2 – MTX 8410-44’s
Precision Power A100
Precision Power A1200
Precision Power A600
Alpine SBS-05DC DIN center channel
Optima Yellow Top

Everything in the old set-up was kept except for the Kicker and the PPI A404.

After researching various enclosure types for my subs I decided to go with the DBK10-II "Deathbox" by Decware (www.decware.com). So I purchased the plans online and got started on the build. As any good build starts off I gutted my baby:



The build quickly grew out of control as I held my house hostage with various ‘zones’. The backyard, living room, garage, etc., were all consumed with various ‘stages’ of the build. It was a mess for WEEKS!



The boxes weren’t too hard to build, but I did take my sweet time with them. Lots of sanding, and making sure everything was accurate and precise.



I went through quite the debate with myself on what to use to finish the Deathboxes in. Carpet, vinyl, paint, etc.? I eventually decided to get them rino lined, which worked out just perfect. Very clean, strong, and tough as nails! Plus I like the look.

[biju]

The amprack on the other hand did prove to be a bit of a challenge. Making everything clean with hidden inputs, holes, assembly, etc., was a pain in the arse. It was also tricky to make sure that the amprack was securely mounted to the vehicle – however I was able to resolve that issue with some ingenuity and a few special order bolts…









I mentioned the amprack was a pain in the arse, right? Well, I should also preface that with the fact that I’m a novice at this stuff. Playing ‘installer’ proved to be a little hazardous as I lost a battle with a utility knife carpeting the amprack (ER room visit with stitches!)



Power is provided by Stinger all the way around. 0/1 gauge supply to a distributor that splits into 4 – 4 gauge power wires (placed between the DB’s). The old-skool PPI’s have standard 8 gauge inputs, so to accommodate this I bought eight 4 gauge to 8 gauge reducer adapters. They look sweet in addition to being functional.







After wiring everything I was more than happy to power her up. Gently turned up the volume 1/4 of the way and heard sweet sweet sound. (everything flat, no processing). I was pleased with what I was hearing. However, a little intimidated to turn it up until xover and tuned, etc. Played with the settings a while, and came up with settings that I felt really pushed the Deathboxes. (I was anxious to hear them both in concert pushed to the limits!). Here are the settings:

# Crossover #
[Frequency(Hz)/Slope(dB/oct)/Level(dB)]
Front:160.0/24/-1
Center:160/24/-1
Rear:160.0/24/-1
SW:63.0/24/-1

# Parametric-EQ #
[Frequency(Hz)/Level(dB)/Width(Q)]
Band1:40.0/+6/3
Band2:125.0/-3/3
Band3:1.0k/+4/3
Band4:2.5k/+5/3
Band5:8.0k/+6/3

I’ve got the ability to set six parametric configurations, as well as six xover configurations – so I’ll be playing with those more in the future to accommodate various musical genres. But for now, the above is what I went with to initially hear the system pushed. With the gains set properly I finally cranked her up! LOL, OMG, WTF?!!! PURE INSANITY!!!! There was nothing but crystal clear sound as loud as I could take her (or stand it). The sound was full, rich, deep, crisp, pleasing tones from across the spectrum. Bass tones literally blurred my vision and took my breath as the Deathboxes executed them effortlessly. A friend who came over later to watch the Nuggets game with me sat in the VehiCROSS as I cranked it up. With the same blurred vision I was experiencing he looks and tries to yell over to me, “I can feel the bass crushing my nuts!”. My labors are validated. LOL… I wanted the ability to enjoy DEEP clean bass as well as overall SQ - I’m pretty sure mission accomplished!

Here are the final pics of the build with everything installed:





-biju.

[Ldub]

VERY impressive...nice clean job on the finger...

OH, & the system turned out good too!!!

Couldn't ya find any BIG subs ?

All kidding aside, very well done. Hope to be giving it a listen soon.

Ldub

[Locomigo]

What processors did you utilize? Trying to determine what crossover filters they employ (Linkwitz-Riley, Butterfield, etc) 24dB roll off is pretty good.

Did you RTA to find the dips n bumps to achieve your parametric EQ curve?

Curious, but decent set up, those death boxes look to be an adjustable 4th order bandpass. Do they move as built, or was that three different options for placement within the sealed portion of the enclosure?

All in all looks pretty decent. Is the dragon your wheelin rig, or the street pounder?

Hafta hook up and take a listen. Its been a few years since I was in that industry. Probably 10-12 years now. Do commercial A/V now.

[Hotsauce]

I have a single Deathbox in mine. Port pointed to the rear

http://www.decware.com/newsite/dbk10.htm

The insert is intended to slide to tune the box for the speaker you put in it. Yes, its an adjustable 4th order

Some of you at the first Mohegan Sun, or the BBQ at Bantan's place heard(felt) it play.

2 of these would be no joke.

John C.

[biju]

Thanks Scott for merging the two... I didn't think about that!!

Loco - The Dragon's my wheelin' / everyday driver rig. It's the one I'll be using for the trails at Zu. The Proton's coming with, but she's going to stay safe and sound on pavement.

Currently I'm kind of 'slumming' it by using the active crossovers built into the Alpine head unit. I plan on going with the Audiocontrol DQXS later this summer (after I recoup from the sticker shock of what I just poured into this project!)

Same situation with the parametric settings - all from the Alpine currently. Note, the parametric settings listed above were set that way to 'push' the system initially. I just wanted to get a wee bit crazy I guess and see the side walls of the VX FLEX!. The other settings I'm using (not listed) came about simply from what I can hear (spent the day tuning, listening, tuning, listening, tuning, etc.) I know what an RTA is, but not sure where to find one. I competed (once) as a young buck in IASCA in 1993, so it's been a while for me also... (I just couldn't outgrow this hobby I guess). Can I just go to a car audio shop and have them spec out my set-up so I can find those dips/bumps in the spectrum? How does that work now-a-days?...

The enclosures were very cool to build. If you poke around Decware's site, you'll see the info on the Deathboxes. They're 'tunable' to the specific driver and environment, etc. I was able to listen to the enclosures in the VX as I 'tuned' them. The design allows you to move the inner insert up and down to adjust the sealed chamber's volume, etc.) to find the best possible sound for the interior of the VX, and nature of your sub. What a great concept, huh?

-biju.

[Locomigo]

Excellent... I competed in Sound Q and actually judged wuite a bit in the '92-95 range. Did installs from 88-96 professionally and still do some on the side. Whether it's car, home, or business, I have the triple threat knowledge, and add to it the video, networking, computer, control systems, telecommunications, and power and I suppose that just about anything is possible with enough money, time, and creativity. >; -)~

So back to the topic at hand... I dont have a mobile based RTA, but I do have one of these in the shop and we utilize it when setting up theaters, conference rooms, board rooms, lecture halls, etc.

I would imagine if you would have the ability to meet up soe evening/weekend I could gain access to the unit and we could play aroud with it, your settings, etc. It also has ability to measure SPL, polarity, and some cool little tests.

Those deathboxes are pretty sweet, much easier for a GOOD result than the MANY formulas, analysis of the vehicle, driver specs, and determining the style of box. That is always fun designing your own enclosure but a HELLUVA lot of work.

Best I ever did was 2-10s in an 8th order push/pull configuation in a second gen Probe. Before we blew the rear glass out of its seal, onto the road, we were able to hit 148dB. Powered with an old RF Power1000 amp in a 2 ohm load, bridged.

I look forward to hearing your setup, it sounds nice and Im a HUGE fan of Bostons!

[IndianaVX]

Biju,
sounds like an awsome system. It has been so long since ive had any power in my ride, other than factory. anyway, when i USED to mess with stereo equip, i always kept flymn and the bb's "tricycle" on hand to test the range of epuip. and its always good to have varity, when you have great sound in your vehicle. congrats on getting it all to work....lol
david
'

[nfpgasmask]

Dang dude, I can see why you haven't gotten to the windshield just yet. You wanna do my Ebony up for me??? That shiz looks tight!

Very nice indeed. I'm jealous of your mad skillz with the saw. Not so much jealous of your skillz with the utility knife though! That prolly hurt pretty bad.


Bart