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" It's not Class D."

Stereophile differs from the assertion about ADH .

"Designed by French engineer Pierre-Emmanuel Calmel, the Expert Pro, like the D-Premier before it, is conceptually similar to Peter Walker's "current-dumping" amplifier from the 1970s, which coupled a low-power class-A amplifier to a higher-power class-AB amplifier. In the Devialet amps, the current source is instead a class-D amplifier..."

As I always do with class-D amplifiers , I inserted an Audio Precision auxiliary AUX-0025 passive low-pass filter, which eliminates noise above 200kHz, between the test load. This eliminates the risk of driving the analyzer's input stage into slew-rate limiting, which would interfere with the distortion measurements. Without the Audio Precision filter, there was 120mV of ultrasonic noise present at the amplifier's outputs.
"

Along with Positive Feedback :

"At the same time, Devialet used the D-Premier to introduce a completely new power amplifier technology named Analog Digital Hybrid, or ADH for short. It was Pierre Calmel, one of the founders of Devialet, who conceived the idea of taking an exceptionally linear Class A amplifier and combining it with a highly efficient Class D stage. The Class A amp provides a very clean analog voltage at the speaker, and the powerful Class D stage takes care of the current demands of the load. ADH technology was revolutionary and is only available in Devialet products."

As does Devialet themselves :

"Invented by Devialet, ADH® Intelligence is the world's first hybrid amplification technology. An industry-defining invention, ADH® works by simultaneously harnessing all the linearity and refinement of Analog amplification (Class A) and all the power and compactness of Digital amplification (Class D) . Operating in parallel, our patented hybrid amplification system dramatically enhances performance."



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