So, as I initially asked, still not clear if the XL4 is a good choice for the sources I use. I mostly use the iBasso DX90, doesn't have an optical out (very few at this price point will), does have coax out. Also have a Pono on order, coming eventually, LH labs player, coming even later. I do have various iPod touch, and Samsung YPP left over, which I use as backup here and there. The line out on the DX90 will just utilize the amp part of the M8. Is there another way? Thanks