@jeales Your statement about frequency response varies by load on class D amps is not necessarily true. I have now built 11 different Class D amplifiers. 3 of them are very good and 2 of them, I was able to modify or add
PFFB circuitry. It is similar to an impedance correction circuit. On my 2 amps that I've added this, frequency response does not vary with load.... I'm not sure how widely this is used, but it is definitely out there.
Class D amps that are superior to all or most?
Recently, I have heard about some Class D amps that may be close to the best there is regardless of class. Certainly, this technology has been in development for decades. The main issue has always been the switching power supply. In this regard, I have taken notice of AGD. They have created a whole new power supply that “switches” at a frequency 100 times the normal silicon based MOSFET. The designer uses a gallium nitride based PS. Interesting, it is enclosed in the KT88 glass envelope that sits on top of his amps. I am aware of two more pricey amps that seem to be also at the top- the Solution and the Merrill. There must be others that compete for the title. After my thread, “Is there a SS amp that can satisfy a SET guy?”, I am still on the quest.
Don’t want to spend $50K!
Don’t want to spend $50K!