DAC's - Oppo 105D vs Krell Connect

My system: Krell HTS 7.1 (ver 2.8) Aragon 8008 MkII ML SL3's

sources are Tidal via iPhone6 via bluetooth to Apple TV connected to HTS via optical

I'm told the DAC's in the Connect and Oppo (supposedly the same) would produce a much better sound than what's in my HTS.

1. would I really hear a noticeable difference between my current system and either the Oppo or Connect as a DAC?

2. would the 105D produce as good of sound feeding through my HTS using the Balanced out analog as the Connect?

3. other options?

thanks

scott