Distortions,your hearing is excellent. What you are hearing is the best class D amps made to date that no one paid any attention to. The DS series amps from ARC. Lowish DF for natural bass (the DS225 is under 200) , no NFB, in house output, no OEM modules, huge linear PS. There is no other class D designed this way. I have owned over 10 class D amps over the years including one of the first pair of Veritas that Merrill produced. The ARC amps best them, the DS225 has a fleshed out midrange that competes with the best of class A plus all the desirable attributes of class D including low noise, low heat, high output.
The Future of Audio Amplification
I have recently paired an Audio Research DS225 Class D amplifier with an Audio Research tube preamplifier (SP8 mkii). I cannot believe how wonderful and lifelike my music sounds. The DS225 replaced an Audio Research SD135 Class AB amplifier. Perhaps the SD135 is just not as good as some of the better quality amps that are out there, but it got me thinking that amazingly wonderful sonance can be achieved with a tubed pre and Class D amp. I have a hunch that as more people experience this combination, it will likely catch on and become the future path of many, if not most audiophile systems. It is interesting that Audio Research has been at the forefront of this development.