How is btr1 compared to da2? I like the convenience of wireless but is da2 better sounding if source is a phone with streaming service like Deezer - Spotify ? Thanks
I use Spotify (extreme) and Poweramp (Flac) and I enjoy both. I listen to all music genres, but primarily rock, indie, electropop, americana/roots, and new wave music.
I use these primarily with Audeze Sine headphones at work or VE Monk+ or K300 (300 ohm earbuds). They are able to power the planar magnetic Sines just fine. If I'm at my primary desk at work, I plug the DACs into my SMSL VA2 headphone amp for more juice, but it works fine standalone and I dont need to crank either one to max to hurt my ears.
The Fiio BTR1 is warmer sounding and this may be due to the AK DAC, which seem in general to sound more warm than Sabre DACs, in my experience. The DA2, which uses the Sabre 9018 is colder and crisper sounding, which I expected using a laptop with the same Sabre DAC built-in, and using the Schiit Stack which uses the AK series giving a warmer sound. The DA2 also has slightly better music instrument separation than the BTR1 which tends to match the specs given. Neither of these sound as good as my desktop setups though.
That's really the biggest difference between the two imho. Warmer sound vs a slightly clearly, colder sound. Other things to consider:
The sabaj DA2/Idea is usb-c based so it does drain more battery than the Fiio which uses BT 4.2, so that may be a consideration.
In practical uses, I have tended to use the Fiio more often because I can charge and use it at once without using a hub so far. It's also easier for mobility since it's wireless and has a built-in clip.
So I guess to summarize (and I apologize for the random train of thought):
Fiio BTR1: Warmer sound signature - which makes music sound fuller
Pros: Wireless/no dongle required, uses less power on phone, built-in clip, nice design (my co-worker buddy wants to get one after seeing it)
Cons: Needs to be charged if not near power source, slightly less music separation, can be slightly bloated sounding because of warmth on some songs
Sabaj DA2: more precise sound signature, colder, higher resolution support
Pros: higher res support, better music separation, independent volume controls, comes with OTG cables (I dont use them though)
Cons: drains battery more than BT, dongle'd
Let me know if you have any further questions.