Ferrari, that would be calling me a fibber. Like I wrote, I used other conventional amps, including Pass Labs fair. Nothing ever came close, including the latest class A ware that approaches the fierce speed of resolution to the faintest nuances offered by my amps and preamp by the same maker.
I hope you don't mind me offering just few pointers when auditioning class D amps. First of all, don't be sure your system is conducive to class D amps. Secondly, there is a quality hierarchy applicable to class D amps as you found out.
On the first point, I have had the same monos and preamp for years of listening. During that time, the resultant sound moved through a series of personalities. At one time, it was airy and whimsical. Another time it sounded warm but focused.
After eschewing commercial speaker cables, and employed the short ribbons I use now, the sound took a revolutionized step. I upgraded my non oversampling DAC which I sent to Henry Ho of H2O to work his genius on. The stage stretched fore and aft, bass grew in heft and musicality, highs perfection, mids as natural as it gets. The last amazing surge in fidelity occurred when
I could go on and on. If I thought any of the class A amps could do me more, I would be happy to buy them. The knowledge Henry makes class D amps and class A preamps to be as squeaky clean as can be, I knew there was a way to harness the best possibilities.