Just uploaded the 'MixPhase1' 44.1 filter into my R-2R; much better! I suspect that in 2-4 weeks we'll have an assortment of filters for all sample rates.

For those that know I'm up to my elbows in DAC's, 44.1 with this filter is not as good as the AK4495S, but it settles the question in my mind as to whether this DAC can achieve very good performance.

I've been collaborating with with JLSounds for the last ~8 months to design it.

Hopefully mate. Firmware is for the most part done, we're doing some final tuning. From there, is whatever time lead in getting the parts.

Can't really say definitely; still haven't received the transformer that is suitable to drive it directly. My suspicion is though, it's the ISO 3.3v / Reflektor-D that's elevating the performance the most over say the 3.3v as tapped from an Amanero. My experience say that the SSR03 is helping a bit too. Time and again engineers build PS's onboard they believe do not lack, and yet can be improved upon (even in a pre-reg configuration such as this).

I'm listening to it now running Pauls minimum phase filter and there's no harshness, wide accurate sound stage, very good.

So when the dust settles, I suspect it'll be both - very good DC supplies + the right filters.

Soren hinted at a version without onboard PS's or output circuits - hope he gets to it; that'll really allow builders to play. But as it is, this DAC will certainly stay in my rotation.