Well, let’s try one more time.
Think of it this way. To get anything analog recorded it must first be converted. There is no such thing as an analog recorder without conversion: even tape and vinyl are major conversions.
So, the quality of recorded analog is completely dependent on the quality of the conversion.
All modern A/D converters first convert analog to DSD (PDM) and then if needed, PCM. This first conversion to DSD uses what is called a Sigma Delta Modulator—a fancy processor that is mathematically (to some extent) inaccurate (it guesses). Once the final results are captured, the secondary conversion to PCM requires a “simple” digital low pass filter. Though technically simple it certainly has a sound to it (which is one of the reasons early Pyramix users hated the sound of DXD - their LP filter sucked the life out of music).
The first conversion to PDM (DSD) is as close to a true analog capture as anyone has yet managed. As many know, you can take the digital DSD stream and put it right into the input of an analog preamp and get glorious music. Depending on the sample rate, there is nothing lost. A perfect capture.
A PCM recorder, on the other hand, is a two step process (DSD-PCM) and because nearly all commercially available A/D converters (pro or consumer) use off the shelf chips from AKM, TI, AD, etc. they do the best they can within their limited space. (This is the same problem we brought up when we first launched DirectStream. A dedicated FPGA used to upsample incoming digital before conversion to DSD (through a SDM) will always sound better than a chip).
By focusing on the best A/D converters using only the first step in recording (DSD), the capture quality at 2X to 4X DSD will always beat PCM (and tape).
Lastly, it should be noted that technically speaking, one could build a PCM recorder that equalled DSD if they used an FPGA, a lot of programming, and extremely high sample rates. It’s just never been done.
So, we stay with what works.