New user with a couple quick questions.

1. When I use the device in Windows with no driver, it allows me to set Windows bit rate to 32 bit.  After I install the driver, it only allows me to set to 16 bit or 24 bit.  I am sure it does not affect audible performance, but still would like to know why that is.

2. I use Denon AH-D7200 headphones.  They are very efficient - 25ohm impedance and 105db/mw.  Should I be using the 1/4" output or would the IEM 2.5mm be a better match for them?

Thank you for any insight!