I see. I might have to use the X1 on its own with just onboard audio then. Far from what it should be, but ah well.
All I can think of that might be appropriate is the E11, which is quite expensive in the UK. But, would that be the end of it? Of course not! I'd need to buy an external DAC as well! Enough, I'm done with this stuff.
edit: Also the E11 can't be listened to whilst charging and can only go for a few hours before running out of power. Great.
Ask Oliver for 1x and 2.5x gain for your X1:s