DaSchI own the Beyerdynamic DT1900 Pros. Great headphones. I also own Woo WA3 and WA6 amps. If you don’t own a DAC, this is a super nice amp/dac solution. If you own a quality dac, I LOVE the WA3 amp and DT 1900 combo. High end, tube goodness tone at mid-fi prices.
DaSchYou need to ask yourself a few questions. What are you using as the source component? A cd player, dap (digital audio player) turntable etc. What is your budget? Are you building a desktop/computer stereo or is the dac going to be a stand-alone dac in a home stereo system?
I personally run a cd transport to a Cary Audio 100t DAC. I also use an Astell & Kern AK100II high res player to the dac, then output from dac to the Woo amps. I use the WA3 75% of the time and maybe hook up the WA6 the other 25%. I prefer a warmer, laid back, spongey-tubey tone as compared to the more dynamic, quicker, solid state tone of the WA6. Both amps will play well together with your HD600’s and DT 1900 pros.
If budget is a factor, you can run a dap directly to the amp using the built-in dac of the high res player. You simply use the headphone output (usually its a digital out in a quality dap) to the RCA in of the amp. You can always add a better dac in time. My Astell Kern dap sounded very good hooked up directly to the Woo amp.
Hope that helps....
DaSchNo problem. Remember this is a fun hobby and to enjoy the music.
Stick with quality components. Buy the best you can afford. Take care of your gear and it will take care of you. As you upgrade, quality name components will be easier to sell at higher prices. Woo, Sennheiser and Beyerdynamic are all good examples of quality, name components.
Good luck
DaSchI own the WA7.
I use it with Beyerdynamics T1 Teslas, DT 880's,(actually, the entire line 770's through T1's all 600 ohm cans), as well as my Sennheiser HD600's, and it does a very nice job.
I use the DAC out to DAC my WA2 and my WA6.
All very nice compliments to the Beyerdynamics and Sennheisers.