I have to say, I've been listening to these with a Schiit Lyr 3 and OMG, I love what I am hearing. Different tube flavors are wonderful. I've settled on a Sylvania 6sn7, and the huge stage, wide and deep with specific layering of depth is addictive. These Nighthawks reveal it all. They may not be perfect for everyone, but for now, they are for me. Really addictive sound.