For the what, 500$ you spend on the signature stack you could’ve bought the Schiit Asgard 3, probably by far the best amp for 200$ (at least according to this boy: Get AMPed! WaveTheory's Roundup of (most) <$200 Head Amps), plus a DAC like the Modi, or even the Zen Dac, and even got a hybrid tube amp like Xduoo MT-602 or a full tube like the Little Dot MK2 in there AND bought some tubes for either of them, and these headphones are notoriously amazing on tubes.