But the AKG 240s are semi-open back headphones thus don't you risk sound bleeding with them? The AKG K52 are closed back, thus no bleeding.

I have read the semi and open back head phones can cause problems like this. I have no personal experience as I only have used closed back. YMMV


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64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware