Alpine RF modulator hack?

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=32997
Printed Date: May 10, 2025 at 6:17 PM

Topic: Alpine RF modulator hack?

Posted By: snoVVman
Subject: Alpine RF modulator hack?
Date Posted: May 30, 2004 at 7:02 PM

Hello,

We all know that with RF modulation, sound quality suffers. I want to retain my late-model OEM head unit and add a MP3 changer (CHA-634). I can use an interface/converter and the sound quality will be good but the head unti will address all of the MP3 tracks (in folder) as linear tracks. So, if I have 200 files, I would have to step though a lot to find my music (I'm told that the stepping has latency also and it is not cached).

I can use the Alpine CRA-1667RF. It can recognize and control folders. But, it is RF modulation.

Does anyone know if there is a way to modify the CRA-1667 to "tap" the audio out, prior to the RF section, so that it can be used as line out (perhaps with a line driver)? This way, I can use the Alpine controller to navigate folders and files, and have line-out into the factory through an auxiliary converter for better sound quality.

I was thinking about buying one to see if I can tap into the circuit somewhere.

Thanks,

JAMES.

Replies:

Posted By: snoVVman
Date Posted: June 01, 2004 at 8:49 AM

Bump. Anyone?

JAMES.

Posted By: DYohn
Date Posted: June 01, 2004 at 10:13 AM

No idea how to accomplish what you describe. But why not simply use an MP3 player with a line output?

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Posted By: snoVVman
Date Posted: June 01, 2004 at 1:01 PM

Good question. I have another vehicle w/ a CHA-634. This will allow me to chage cartridges easily. It is also nice to be able to burn MP3s on CDs for easy exchange.

JAMES.

Posted By: evolutionoftym
Date Posted: June 03, 2004 at 2:56 AM

do you have a factory radio or not? if it's aftermarket with an Aux in then the CRA-1677 RF has an RCA output that will work

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Posted By: snoVVman
Date Posted: June 03, 2004 at 4:55 PM

The CRA-1667 does not have RCA outputs. It is an FM modulator. It only has RCA auxiliary inputs.

JAMES.