Thanks for your feedback Matt, I appreciate it!
The DSD-S was changed from 8x oversampling with adaptive digital filtering to Zero filtering and oversampling when it comes to PCM processing, prior to DSD conversion.
Also, the output stage was re-biased for twice as much higher current than it was before.
From now on, my intention is to offer three options for the DSD-S digital filtering when it comes to PCM processing that will satisfy many tastes.
Just to make it clear, the DSD-S is a midline product. As good as it may be, it is nowhere near the reference DSD-M that has my own DSD to Analog converter, as well as a differential Class-A tube output stage built with a pair of NOS Philips E182CC tubes and custom Lundahl transformers wound with OFC wire.
Best,
Alex Peychev
APL Hi-Fi Ltd.