Can you use the 4.4mm and 3.5mm outputs at the same time?

Yes. The 3.5mm output and the positive phase on the 4.4mm output are wired together.

However, since the Pentaconn 4.4mm socket is a fully balanced output. it will sound louder than the 3.5mm socket if two pf the same headphones are plugged in.  Always use a balanced cable with the 4.4mm connection, as it contains the two active negative phases that would otherwise short together on a non-balanced cable.

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