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I have a crack-speedball with HD650s.
A lot of fun to build and listen too. I have to say I never really understood all of the OTL or high impedance stuff, but by a lot of accounts they are best with certain high impedance headphones.
I found that the crack does pick up electrical noise very easily which meant I can't use them connected to my PC (via a DAC) so I use them only with the turntable and an audioengine B1 bluetooth receiver for streaming which is great.
neu-
Cool. I thought about the Speedball upgrade, but decided I can probably do it later, if I feel like it and buy the parts locally.
I was planning to use it as a desktop thing, streaming from an iPhone via an Audiolab M-DAC+, but there would be a laptop nearby (it has a SSD, so hopefully not too bad?).
Looks like a lot of fun. I’ve already caught myself eyeing up the pre-amp and mono-block kits as well…
rodan
I believe so. I’m going to be driving my 250Ω Beyerdynamic DT770 with it.
I don’t think you necessarily have to use high-impedance headphones with it, more that you can if you want to.