Popular Post Sagittarius Posted May 23, 2019 Popular Post Share Posted May 23, 2019 First , thanks to Audiophilestyle for this great opportunity. I have a few things that I am curious about: - Where does Bruno think class D is heading and where are the improvements going to come from? There are companies which now use gallium nitride transistors and are pushing the switching speed into the MHz region. Does Bruno think this is the way forward? - Class D has achieved very low levels of distortion, but is it possible for class D amplifiers to continue their evolution into something close to a straight wire with gain, i.e. minimal phase shift in the audio band? - Are you using the same feedback scheme which was developed for ncore in the new amplifiers? - Does the high damping factor of class D amplifiers negatively affect the subjective sound quality of some types of speakers as some reviews seem to suggest? Finally some requests: A few things that I did not like in ncore development and I hope will be better with Eigentakt: - It took so long to get ncore amplifiers with a variety of power ratings, particularly for the lower power parts and when they came they seemed to be positioned below the nc400/nc500 and nc1200 . - Did we really need a halo part with, frankly, an eyebrow raising price (I am looking at the nc1200)? - Please no capacitors with low capacitance stability vs frequency in the output filter in the lower end models. The polyester caps used in the nc400/nc500 apparently acted like capacitors with variable tolerance when faced with the variable switching frequency of the amplifier creating additional errors for the feedback scheme to correct. Some users have replaced those caps with metalized polypropylene caps (space on the board did not accommodate normal polyp. caps) and reported noticeable improvement in sound quality. I think the coming 5 to 10 years will be great for class D amplifiers. There are more companies developing and adopting the technology and Bruno was one of the instrumental figures in achieving a well earned acceptance for switching amplifiers in the audiophile word. I am very excited to see what Purifi has to offer for both amplifiers and speaker drivers. DuckToller, audio.bill, skatbelt and 1 other 4 Link to comment
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