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I have a 1702 monitor for my C64. I use a cable that splits the video/audio from the C64 to the Red/Yellow/White thing. Something like this. The white cable is the audio. I believe this is an RCA connection.

I have an audio mixer that accepts line level. I would like to take the audio from the C64 to the audio mixer.

Do I simply get a female RCA to 1/4 inch plug? (so something like this).

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    Be aware that "line level" means something different for pro-audio gear from what it means for consumer audio gear. en.wikipedia.org/wiki/Line_level#Nominal_levels The consumer audio line level is not as high. If the channel you're plugging in to has a gain control, you may want to turn the gain up. If it doesn't have a gain control, then you may just have to live with the fact that the signal is not as loud as you had hoped it would be.
    – user10478
    Commented Sep 25, 2018 at 15:02

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Yes. What you have on the RCA plug coming from the C64 is line level mono audio. You can connect it to a mixer using an RCA-to-phono adapter that fits your mixer. Often times, the phono jacks on mixers are for stereo input. So you might need an adapter that goes from Left+Right RCA inputs to a phono plug. Just plug the C64 output to either the Left or Right input, and adjust the mixer balance accordingly to filter the unused stereo input.

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  • Phono plugs aka phonograph plugs are RCA plugs - you want to adapt RCA to a standard headphone plug (not the more modern smaller 3.5mm, the old 6.35mm/1'4" plug. (This plug is sometimes called a "phone" plug, for "headphone plug", which might be the source of your confusion. Sounds like it's best if we avoid using "phone plug" and "phono plug" completely :).) Commented Sep 28, 2018 at 20:26
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    @Jim MacKenzie Yep, I was confusing "phone" with "phono". Maybe I'll try using "TRS" plug in the future. Thanks for clarifying.
    – Brian H
    Commented Sep 28, 2018 at 20:43

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