So happy to hear you like the DT770's! They were built for people who spend hours in studios, so comfort had to be a top priority!
As far as the E1 goes…they actually fixed the Mac issue in a recent OS update. But just for the sake of being thorough, I tested it out this morning and can confirm it still works.
Now, the iPhone 7 is a little bit trickier. It’s hard to get USB DACs to work with any iPhone model. Most folks use the USB Camera Kit, which is an old lightning to USB adapter that, for some reason, makes some USB DACs work. I can’t vouch for the E1 specifically.
However. Thanks to its analog amp capability…you can use the E1 as just an amp for your phone. But you’ll have to plug the analog cable into the little lightning-to-headphones adapter that came with your phone. That adapter has a DAC in it so it’ll take care of that part.
That’s more or less how I had to use the E1 with my iPhone 6 Plus, just without the headphone adapter part. And that’s more or less how most amps will work with an iPhone, since they’re so touchy about USB audio connections. So if you’re okay with that, you’re good to go. :) Sorry if this is redundant info since you’ve been reading through my reviews, it’s just something that’s good to be aware of.
Here’s my standalone review of the E1, just in case.
Have a great day and thanks again for reading!