Howdy. I'm in a situation where I have to mix on headphones. The good news is that I have access to Grado GS1000's. My question is this.... The D/A that I'm using is a Lucid DA9624. I'm wondering how much WORSE this is compared to a dedicated headphone amp like the Grace m902. I'm trying to prepare myself as much as possible before going in (and if there are enough reasons, i may be able to convince the client to get his hands on a Grace). Thank you much. d.