The burn in will really make them sound completely different. I think that using the pc's sound card would be fine. Just turn them up a click past what you'd consider loud if they were in your ears. About four days will do it.
I got quite lucky on the shipping. I've been cooking the MDP all day while at work. Just put them on and cranked up the lyr. Man these are good. Listening to a new group I recently discovered called Brown Bird. They are indie folk I guess. The acoustic bass is rocking my sock off.
I've used the A2 as preamp with a speaker setup. The A2 seems to deliver a very nice clean signal without changing the character of the sound from the dac to the amp. What do you guys think abouat the A2 powering the new hifimans? Think that the A2 will do the trick?
The bottom line is that even though I haven't tried the new HFM offerings, it seems that they've got it right with regard to weight and comfort. Each person that has got to try them comments immediately on how comfortable they are. So as someone who struggles with heavier hp's, I'm very much looking forward to these.