You need to make sure your DAC can support it. For example, my Audio Mirror Tubadour II SE could not (I asked the designer and listened, it was bad). My Benchmark DA3B (to 2 preamps) and my Musetec 005 (also to 2 preamps) had no issues.
I believe my Musetec 005 would have no issue going to 2 amps. My DAC3B has no volume control, so only to preamps.