I'll second that. I have never heard an audible effect of output impedence. Specs are fun to compare but the proof is in the sound in your room with your mix of components. Try the 30-day free home trial and see what it sounds like if you think the specs aren't good enough. I was amazed, you may not be, but what can you lose? I should also note that I have heard some equipment with great specss that sounded awful and vice versa. Let the force be your judge.