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well does one port use more battery then the other?
does one port produce better sound then the other?
slightly better sound quality would not be worth a large hit to the play time
Does one read the review of the other? I covered the sound quality compared between SE and BAL ports.
Regarding battery, balanced output has almost 3x more power, so the battery drain should be higher. Again, I don't know if they power down the second DAC when used as single ended or keep both on, thus don't want to speculate. Besides, these are very power efficient DACs designed for smartphones. We are not talking about desktop ES9038 Pro DACs where one vs two make a big difference in power consumption.