The double amping is precisely what I'm worried about. What's the point in taking the clean signal from the AK320 and cranking it to the max(reducing battery life) and then reamping with the cdm.? What really happens when the "line out" option is selected in the 320 menue? Does anything really change or is it just wide open? This is the one thing I am not pleased about with my new ak 320 is the "appearance " on paper that it has a dedicated line out when in fact it's just the headphone out turned up 100% . The balanced out from the xlr's on the cradle are even tied to the headphone out level. No real gain there other than changing the connector type. What a useless gimmic . I can just order a set of trrs to xlrs and saved the money or even solder up a set my self .I think that is very misleading but I know this is the wrong place to vent about this. It does beg the question then ,what is the best gainstaging for this set up. Maybe it's no better or even worse for headroom to have the output cranked from the ak or dap? Maybe it's better to go 50/50 on the input to volume out of the cdm? Anyone have any experience trying different staging to the input? This had me looking around for a dap with a "real" dedicated out and not a "pseudo " line out. The onkyo DX-1a might have one but I can't tell again from just the adds. They all hide the dirty details behind flowery descriptions and let you find out the hard way. I'm really liking the sound of the cdm with the mullards but finding the right way to integrate it into my system is proving to be a little challenging . I wish it had more resolving dacs then the choice would be obvious. I would then go digital in (preferably spdif) but no joy there either. Maybe I'm just making a big deal out of nothing because it does sound good paired with the ak but I just know there is more resolution to be had with a proper source feed from dap. Anyone have any ideas who makes a portable dap with this feature that sounds good? I got my wallet out !