very interesting...I use an iPhone + DFC as my portable rig, very similar to you. I am strongly considering a DAP - perhaps the iBasso DX220, or the FiiO M11 Pro, etc. So you preferred the Cobalt? Any additional color you can provide? Thank you
At the moment i'm deciding between a lg g8x and the normal fiio M11 for portable setup and i heard all of your listed equipment so i can try to give you my impressions. Have to say though that lately i'm putting portability and comfort to use way above sound quality thats why i dumped a few things which sounded great but just didn't get any usetime because i don't like the hassle with it.
The Fiio M11 Pro sounded to me like a typical midrange DAC. Had a big soundstage and performed well but wasn't worth 699 bucks for me. In direct comparison to the DFC as well as the Chord Mojo it sounded more grainy and i wouldn't say it's worth to get it if you already have one of those dacs. Unless you like the fact of having an extra device to carry with you besides your smartphone which is only for your music. Which i personally dislike. I like it the other way around just having one device.
The DX220 had an extreme battery drain and was very laggy with third party apps. Didn't took me 2 hours to put it back in the box and return it. To be fair it was a refurbished one so maybe that was the issue for the battery.
The normal M11 has a way smaller soundstage than most DACs i've heard which i personally like in all day use. I don't like myself be lost in the music while commuting or participating in traffic. It sounds very clean and easy to listen that's why i like it. For 499 it's the best package for me and the UI is fluid and battery is insane. Only problem i have is again having an extra device with me which weights around 2 smartphones and the experience on a smartphone with bigger screen, mobile data to directly stream is still nicer for me.
Dragon Fly Cobalt sounds very good on IOS devices especially on the Ipad which sounds better than on IPhone or IPod. The soundstage is sometimes too much for me for daily portable use though. I like the M11's smaller headroom more for portable use because it's easier to listen to but i know that is uncommon and only my personal taste.
Now today i received the LG G8x with it's "hifi quad dac". Sadly the Fiio M11 which i have in direct comparison sounds far superior. The LG still sounds better than a normal smartphone though and maybe i'll still use it as my main portable device since it's just the best mix of comfort, speed, UI and sound and i can pair it with my dragonfly.
If you're used to carry offline music or extra devices with you you may like a DAP. I'm somewhat reliant on Internet and Apps like Amazon Music and never owned CDs in my life (I'm 22) so a DAP always means more struggle for me than a smartphone.
The setup you have with IPhone + DFC is in terms of sound in the upper corner, in terms of portability and comfort one of the best and in terms of price performance ratio also insane. So i'd stick with that.
I did all tests with Amazon Music HD which is between 48 - 192 khz and rather sensitive IEMs. So i can't give my opinion on hearing extreme good audio files like dsd and i didn't test the devices on power hungry headphones if that's what you look for.