Analog is obsolete pure digital not class D ...

True, Class D is analog, with a switching output.

Technics is calling theirs a pure digital amplifier and it’s hard to tell with what I’ve found how far they carry the digital part. We know it does A/D conversion, and DSP based speaker impedance correction.

What remains an open question to me (being poorly read) is whether the PWM that controls the output is using an analog feedback loop, like Class D, or whether it relies entirely on the feed-forward design to generate the PWM pulses. If the latter, then it is not Class D and it is IS pure digital.

There is a camp out there that says if an amp generates an analog signal it must be analog amp, and I will never ascribe to that definition. When 99.9% of the signal is manipulated by digital technology, it's a mostly digital amp, and we should call it such.

erik_squires would that be an improvement over class D

@scott22

I think the strategy would be an interesting solution for a problem a lot of amps IMNSHO suffer from, which is a weakness in the bass for speakers near or below 3 Ohms there.  A lot of speakers made today have an impedance which dips below 300 Hz, and you can hear it.

or just a variation of a class D sound which I understand to be light in the bass.

Well, I hate this kind of broad classism since it is rarely borne out.  I've hear plenty of Class D amps which had better bass than some Class A or A/B.

I think it would be interesting to listen to for sure, but trying to arm chair guess what the sound would be like without actually listening to them... that's something I am experienced enough not to do.

Well, yeah, kind of.

A pure Class D amp is a linear amplifier with a switching output.  There is no A/D or D/A conversion really, instead it relies on a feedback loop to switch on and off.

Technics is using all of that.  A/D, DSP and a switching output without a feedback loop.  It's more of a feed-forward correction.

You could do this yourself, by the way.  Assuming you had the measurement tools you could do this all with a miniDSP type of circuit.