I recently pre-ordered the SoundFocus Amp case for my iPhone 6. It has a built in 24-bit DAC and headphone amplifier, but I'm wondering if it'll actually improve the quality of the audio through my headphones that much. It's much more convenient than carrying around an external DAC and amplifier, which is one of the reasons I got it. I'm currently using a set of Vmoda crossfade LPs, which aren't great, so I'll be getting a £200-£300 pair very soon (probably something like sennheiser momentum over-ear). Because I'm using Tidal streaming, which uses FLAC, I want to optimise the sound quality without spending a ridiculous amount. My questions is, is the Amp case, combined with a £200-£300 set of headphones, enough to get HiFi (or close to) quality audio? If not, is there a portable and iPhone compatible DAC that I could use instead?