I’m going to replace the stock cable with a FAW HPC. Would you guys recommend going with the 6.5 termination, or just go with 3.5mm?

Really tempted to pick these up for home use. Given the low impedance, is it necessary to be driven by an amp, or will my iMac suffice, until I get around to buying an amp next year?

Can I ask, how much sound leak would these create in comparison to the L1? I currently use the L1 in the office and there's 0 leak at my preferred listening volume. Would the X1 at low volume be ok for an office?