"Enough" is the key word here. Will you get adequate volume? Yes. Will they sound as good as they do out of full sized amps? Probably not.
The general rule of thumb on head-fi is that you shouldn't buy a portable amp to drive full sized phones unless you really need portability. High impedance full sized cans (like Sennheisers and Beyers) generally require ample voltage swing. This is why tube amps are such a popular solution for driving them and why portable amps running off a 9volt typically don't generate rave reviews.
What about the Mav Audio D1 Tube amp/DAC? I don't care about portability, I care about price.