Right. This device promises a clean signal, tone-wise. But there’s no guarantee what will do to dynamic range, for instance.
Going back to the two scenarios, my two cents:
A) One signal at one amp at a time
B) One signal at multiple amps
I’d get a USB DAC (or digital interface) that exports as many digital outputs as possible. I use FiiO K3 here (1 coax and 1 Toslink) and hook a DAC up with the amp in a dedicated fashion. E.g.:
USB (FiiO K3) → Toslink out → DAC1
– DAC1 → Amp1
– DAC1 → Amp2 (best case Scenario – e.g: Bifrost 2 / Modius)
USB (FiiO K3) → Coax out → DAC2
– DAC2 → Amp3
– DAC2 → Amp4 (best case Scenario – e.g: Bifrost 2 / Modius)
In my setup, If I put my Scarlett 6i6 into the game, scenario above expands to – possibility-wise:
USB (FiiO K3)
– FiiO K3 → Headphone Jack (Balanced/SE)
USB (FiiO K3) → Toslink out
– Toslink out → Modius → AmpA
– Toslink out → Modius → AmpB
USB (FiiO K3) → Coax out → Scarlett 6i6 Coax in
– Scarlett 6i6 → Headphone Jack1
– Scarlett 6i6 → Headphone Jack2
– Scarlett 6i6 → Line out → Liquid Spark
– Scarlett 6i6 → Line out → Liquid Platinum
– Scarlett 6i6 → Coax out → Bifrost 2 → AmpC
– Scarlett 6i6 → Coax out → Bifrost 2 → AmpD
Note I don’t have the Modius or B2 nor AmpsA-D. I’m just stating that in my small system today I have a potential of running as much as 9 headphones – all playing at the same time. And by using 4 DACs (namely FiiO K3, Modius, Scarlett 6i6 and a B2).
Will I ever do this? Probably not.
Clearly, limitation on this approach is that there’s no DAC to rule them all.
But above is just my view. This dilemma is actually something that holds me to keep purchasing more gear.
Hope this helps.