Sound Processor '12 JK -
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back > General Technical Discussions > Stereos, CB & Ham Radios, GPS, & Electrical. > Sound Processor '12 JK

All Bilstein shocks & struts - Lowest Prices Ever and Iron Rock Offroad products - get them from Kolak!SWAG Off Road Knock Out Punch Set (7) Pieces (Tube Sizes)

Unread 07-14-2012, 01:54 PM   #1
Registered User
Join Date: Feb 2012
Location: Lafayette, LA
Posts: 5
Sound Processor '12 JK

I'm looking at upgrading the stock stereo with a sound processing unit, amplifier, speakers, and sub. I read a post a while back Here that talks about upgrading the stock head unit with a sound processor. The premise is that the stock head unit cuts low frequencies or shapes the sound to make the stock speakers sound better. When aftermarket amps are installed, it's crap in and crap out.

I took to some engineering skills and hooked up my laptop running some free real time analyzer software and playing some pink noise through the CD player, and found that this just doesn't seem to hold up (see attached picture).

The problem is, my laptop has a sucky sound card, so I couldn't get any higher than volume level 6 before it started clipping the signal, so I can't get any idea of how the frequency response changes at higher volume levels (you know, like the ones I listen to). I know that some stock manufacturers cut the bass at higher volume levels.

Rather than spend the money on a good RTA or soundcard, I'm taking to the forums to see if anyone has done this test already and could share the results. Do I need to spend $300 on the JL Cleansweep, or can I get by with a less expense line output converter?

TheCrut is offline   Reply With Quote Quick reply to this message
Unread 07-14-2012, 10:41 PM   #2
Registered User
Join Date: Feb 2012
Location: Lafayette, LA
Posts: 5

Success! I just added about 100k ohms resistance to my measuring circuit and was able to get around that pesky sound card clipping.

The results are still very good. At volume level 22, the spectrum is still very flat with the exception of the super low range, though 20Hz by itself comes through nicely. I would say we are fortunate with the stock system that doesn't shape the waves.

That being said, anyone have good luck installing an amp with speaker level inputs, or should I still be trying to get a line converter?
TheCrut is offline   Reply With Quote Quick reply to this message
Unread 07-15-2012, 07:49 PM   #3
Registered User
2004 WJ 
Join Date: Apr 2012
Location: Charlottesville, va
Posts: 157
I think if you used a lower cost line level converter, you're still going to get an improvement in sound replacing the follow on factory components. I think factory h/u's have gotten much better over the last few years and not at just adding features. Just my two cents worth.
What fits your Jeep?? Find out below!!

[URL=""]Crutchfield Fit Guide for Jeeps[/URL]
CrutchfieldMark is offline   Reply With Quote Quick reply to this message

jk , stereo system , stock head unit

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools

Suggested Threads

Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. is not in any way associated with Jeep or the Chrysler Corp.