Kiats
Headphoneus Supremus
You’re totally right, and I should have mentioned it. (I’m so used to my LP6AE I honestly forgot)
The E7 does BT in, which means you can stream to the DAP from your phone, or laptop etc, and then use the DAP as normal. It actually works extremely well, in LDAC the SQ is fantastic. When I had the P6 Pro I would put in my IEMs, keep the DAP in my jacket pocket and control the music, and volume, from my phone. It made for some epic winter walks
You can of course also use the E7 via USB in, which I do with my AE all the time via my Laptop. I will update my original post so as not to confuse everyone.
And the BT on the P6Ps as well the E7 work very well.
And of course, USB in works nicely too.