Can you spot the loudness circuit on this car radio?

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SUMMARY

This discussion focuses on bypassing the loudness circuit in the 2006 Subaru Legacy P-204UH radio to achieve a clean 2V line level output. The process involves removing specific capacitors (C307, C301, C201, and C207) and connecting RCA wires to designated pins, with the purple pin serving as ground. A member encountered challenges with the P-201UH model due to different capacitor labeling and layout. The conversation emphasizes the importance of a clean input signal for optimal audio performance, regardless of additional audio equipment.

PREREQUISITES
  • Understanding of car audio systems and components
  • Familiarity with soldering techniques for capacitor removal
  • Ability to read and interpret electronic schematics
  • Knowledge of audio signal levels and RCA connections
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  • Research how to read and compare electronic schematics for different radio models
  • Learn about audio probing techniques to identify circuit points
  • Study capacitor specifications and their impact on audio quality
  • Explore modifications for other Subaru radio models for similar upgrades
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Car audio enthusiasts, automotive technicians, and anyone looking to enhance the audio performance of Subaru Legacy radios.

BeautifulLight
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Heat up and remove capacitors (see blue) C307, C301, C201, and C207. Simply land your RCA wires to the pins highlighted in red. Purple pin is GND. This should give you a solid 2V line level out. Enjoy your un-eq'd radio:)The above is a tutorial on how to bypass the built-in loudness circuit and get a clean line level out on a 2006 Subaru Legacy P-204UH radio. Unfortunately, I have the P-201UH model. The member who wrote this hack is long gone, so I came here. I popped open my radio only to find that the layout is different. The capacitor values he listed are not on my board. Well, maybe they are, but the labeling numbers are different. Subaru didn't change much until 09' with the 5th generation. I'm hoping this is just another matter of finding a few capacitors and removing them.

Background: Regardless of how much time/money you have stuck into new speakers, external amplifiers, processors, etc... your stereo will only sound as good as the input signal. The loudness circuit needs to go! I want to send a clean line level to my amplifiers.EDIT: I can't open the PDF for some reason. Link to schematic:
http://elektrotanya.com/matsushita_subaru_legacy_cq-ef1461l_sm.pdf/download.html

Will update when I get at the PDF
 
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Have you compared both schematics and found the corresponding tap point on your stereo?
Or you could make an audio probe for a few dollars and spend a few minutes to find the point that way.
 

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