I'm interested in the circuit details.
My understanding was "HDDA" means (discrete) transistor pair in front of a preamp.A circuit like this, done right, can be pretty good.For example Behringer and many others have done this, long tailed pair, driven by a current source, input to a rather inexpensive opamp.
I noticed Sony PCM series use low noise, low voltage, rail to rail opamp AD8620 in their higher end units (D50 in particular).Some circuits are using instrumentation amplifiers eg., INA217, PGA2500, etc.
I am curious what circuit Sound devices uses. Their old gear used transformer inputs.