I'm thinking about getting a Topping TP30. Can anyone who owns one tell me if you can use the headphone out at the same time as the speakers? I imagine not but you never know.. Apparently you can with the TP32 but it's ~2x the price. I would be using it to drive a sub via the low level inputs. My sub has high level ins but they don't like it when I connect my topping TP22 to them in parallel with my mains.