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Converting floating ground audio to common ground audio

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I want to run a 4 wire stereo output (left+, left-, right+, right-) into a common ground audio device (left, right, ground). I have done this successfully with a pair of small audio transformers but these are larger than I'd like. I was wondering if there was a simple way to do this with a few small components. I would prefer to keep attenuation to a minimum.

Thanks alot

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