Hi there!

I own the multiface (first version) and I ordered the sennheiser HD 800 for mixing purpose late at night. 
Before I received them, I am wondering :

1) Should I  buy a dedicated headphone amp? 

2) Can the multiface drive them efficiently??  I mean, does the sound may differ if the hd 800 is not properly driven?

3) Should I upgrade to the multiface 2

4) Stay with my multiface and save money

Thanks guys!

PS:  I own the akg 701 too ... but the combo  "k701 / rme multiface headphone output" doesn't sound terrible.  I have to crank the total mix mixer up to 0 db to drive the akg well...