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Wouldn't the rca method require the tvs volume to be used, since that's where the sound is coming. I don't think there is any way your headunit could control the volume.
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are you trying to get sound from the headunit to the tv?
or the tv to he headunit?
What model head unit...Some have fixed level output on RCA
You could get something like this
https://www.jaycar.co.nz/speaker-high-level-to-line-level-converter/p/AA0482
It takes the speaker level output and turns it into RCA, set the TV to whatever volume, and use headunit.
You'd have to play with the volumes to ensure no distortion etc.
Cheap versions on Ali also
https://www.aliexpress.com/item/Hot-Adjustable-Level-Car-Vehicle-Speaker-High-to-Low-Impedance-Converter-Adapter-2-Channel-RCA-Line/32492513942.html
Jase2985:
are you trying to get sound from the headunit to the tv?
or the tv to he headunit?
This. Are you trying to get the TV sound to come out of the Car Stereo Speakers?
Or are you trying to get the Car Stereo sound to play through the TV speakers?
RCA is likely the best way to connect these two devices, but you'll likely have to adjust the sound volume on the device that's playing the sound through it's speakers.
Why would you want to have the car stereo outputting to the TV speakers? TV's generally have awful, small, cheap speakers. The car stereo has an inbuilt amp and speaker outputs that would sounds a hell of a lot better connected to even a cheap set of external speakers.
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