I am looking for a portable amp that I can pair with my AK100ii which uses optical out/in and can handle at least an HD650. Any suggestions? I had the Mojo, if possible I would like to have something with a far flatter shape which will stack well with the DAP. Thanks in advance!

I am looking for recommendations on a beginner budget DAP that would work well (and be quiet enough) with multi-driver CIEMS. I was actually considering the Shanling M2s but I heard its predecessor the M2 was noisy with sensitive CIEMs, i am afraid the M2s would be the same. Any inputs would...