It should suffice quite nicely. Technically speaking the Titanium HD is an amp. Though clearly not the best when put in the context of standalone audiophile headphone amps which cost the same or more. Obviously.
But it should do great for you. That plus the DT 990 Pro will be like working wonders compared to what you were using.
Alright. I think I'm going to go with this for now and look at external amplifiers down the road. Thanks.