aksakhilIt'd be awesome, got 'em both so I can say that with confidence!
The Crack is intended for headphones with a minimum impedance of 120 Ohm (but is geared towards 300-600 Ohm really).
The D1 has an integrated headphone amp that can handle all of your low-impedance , easy to drive headphones/earbuds.
(unless they are really hard to drive, but then you wouldn't be using the D1 as an amp anyway...)