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Old 04-05-2014, 03:02 PM
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Re: 12' Altitude Stereo Overhaul

Originally Posted by phatcow View Post
Its a 2011 Overland

I want to completely rid myself of the RHR radio

Want a Kenwood DNN991 with the idatalink maestro, and with that a 5 channel amp and stealthbox

Given that the stock system is a "7.1", makes me wonder if i will actually miss the surround feature or if aftermarket will actually sound better.

What actually do the rear tweeters and centre channel actually do during standard stereo music?

The Kenwood DNN 991 is a super choice and it far better right now than the Pioneer NEX 8000.

Our factory system is the worse to hear a properly 5.1 or 7.1 surround system. The reason starts in the DSP, where you have just a generic settings. If you have the opportunity to listen to the Acura, Lincoln or the European (many use the Logic 7) cars it will be great way demo a real surround system. Then compare it to a traditional front, rear and subwoofer set up. I always suggest this first to make sure the differences are heard between the setups. To transition over to a proper 5.1 or 7.1 in the jGC does require $$$$.

In my install for surround sound I used 2 DSP units to create the effect that I wanted. The MS-8 for the surround sound steering via the Logic 7 matrix and the Rockford Fosgate 3.sixty.3 for my fine tuning. Now, I actually hear the difference in the rear door and pillar because of the proper time delay. Depending upon the aftermarket DSP, they all treat the rear matrix differently my adding some sort of effects and/or use a technique of mix up (blending) the original 2 channel signal. My center along with my front speakers gives me a wall of sound similar to a live concert event that uses a L/C/R configuration. I have separation between channels and it is heard in the tweeters as well. A good center channel speaker and the rear pillar should not give you too much high end material.

Right now besides the MS-8, you have the Alpine PXA-H800 that produces a 5.1 setup, but you can get a 7.1 out of it. The other thing about the Alpine, they allow access to custom tuning, therefore, you do not need the 2nd DSP unit like I did. The Arc Audio P8 DSP has no surround codecs, but in the advance mode, they allow you to setup a mixed output for the center from the front L&R Channels.

MS-8 | Car Audio DSP, Powered Digital Sound Processor | JBL US

Alpine Electronics of America, Inc.

ARC Audio PS8 audiophile digital sound processor¬*| Arc Audio

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Laredo X, Trail Rated, QTii, Sele-Terrian, Quadra Lift, Off-Road Adventure Package ii, Nokian Rotiva AT, Tow, AFE CAI, DiabloSport inTune 1000-DCX, Custom Sound System ( HAT speakers, JLAudio , Pioneer , JBL MS-8 & RF 3.sixty.3 -- see the writeup link below for more details)

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Old 06-01-2014, 10:10 PM
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Re: 12' Altitude Stereo Overhaul

Originally Posted by geox19 View Post
One more question Why did you take signal after the factory amp and not before it I see in the install manual it says after oem amp then to lc7i then to aftermarket amp but why not just take the signals before the oem amp wouldn't you get a cleaner signl? I haven't started my install yet so i have no clue just trying to get some info.
Hello. I'm an electrical engineer in the Detroit automotive sector. I have also been a car audio buff for 25+ years. I have won sound quality competitions via IASCA, MECA, SMWTMS, and such. I won't reveal my credentials, but, I can shed some light on the subject .

The reason you can't take full range signal before the factory amp vs. tapping off the factory amp outputs is: volume, tone, balance, and fade control. The signal coming from the head unit is straight line level out. This is similar to what we used to have with a CD player or tape deck going to a home receiver. To make a long story short. This is done to ensure the amp receives a strong "fixed" line level signal with maximum possible S/N ratio.

All volume, tone, balance, and fade control is done inside the factory amp via digital signal processing. Adjustments to your controls / knobs on your head unit are translated to CAN-BUS network messages and sent to your factory amp. The amp decodes these signals and processes them accordingly. The DSP then adds in crossover filters before sending signal to the discrete amplifier outputs.

The factory amp does nothing but receive / process signal, amplify it, then distribute output to the systems speakers. The factory amp is not required if you use something like the PAC C2A-CHY to intercept signal and process the control / knob adjustments. Output of the PAC C2A-CHY is 4 RCA full range outputs controlled by the factory head unit. Add whatever external aftermarket amps you want.

For more info read here:
2004 Dodge Durango - simple system - Car Audio | DiyMobileAudio.com | Car Stereo Forum

Mind you, all this work was done on a Dodge Durango. However, it directly translates to any vehicle. Including my 2012 Overland Summit (WIP).


Gerb (Ge0)

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Re: 12' Altitude Stereo Overhaul


What size speaker wire did you run and was it a pita to get through the connectors into the door?


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