I've been connecting the balanced output of the Sony HAP-Z1ES to an Ayre K-5xeMP preamp. Is the output of the Sony dual differential? Or would it be as well or better to use the unbalanced output? The Ayre has only two balanced inputs, and an Ayre C-5xeMP, Oppo 205, and the Sony compete for them. A 2:1 balanced switch is an option until I find a KX-5 Twenty with more inputs.
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