Haha wow. That's really the best compliment an amp can get in terms of stability. Even "about 1 Ohm" is a kinda understatement because it's really 0.8.
Why does thd over 10KHz matter?
It's kinda funny, isn't it? Normal adults: can hear precisely nothing up there at 20kHz but worry about it. 12-14 year olds: can probably still hear it but worry about anything but that.
It's kinda funny, isn't it? Normal adults: can hear precisely nothing up there at 20kHz but worry about it. 12-14 year olds: can probably still hear it but worry about anything but that.
The highest to realistically worry about in the distortion graph is the 5kHz one. And it's super duper low.
benchmarkmedia.com
Maybe because we can hear above 10KHz? Maybe because that could explain why so many people find class-d sounding bad? Maybe because music peaks go well above 95 dB? I don't know.
And hidden pretty far down in that piece: "To be fair, the harmonic content of the 39 dB SPL distortion is closely related to the content of the music and it should be much harder to hear than the noise produced by the 39 dB dishwasher. It will also be much less than the distortion produced by the speakers."How Loud is the Distortion from Your Power Amplifier?
We took Stereophile's THD+N plots for 7 top-rated amplifiers and replotted the data to show the loudness of the distortion and noise at the listening position.
We can hear above 10 KHz, but not above 20 kHz where the first distortion products appear. Please provide the source for your claim that many people find class-d sounding bad.
I am definitely enjoying my Benchmark DAC 3B + Benchmark LA4 + Buckeye 1ET9040BA mono blocks. Before Purifi class D amps, for 20 years I have enjoyed pair of Quad 909s (low powered class A + high powered class AB design, where feed-forward switched between class A within crossover region, and class AB outside of crossover region). Before Quad I had Rotel 1090 class AB beast.
You notice that in this article Benchmark exposes deficiencies in most “high end” traditional amplifiers, while they actually have recognized PS Audio ICE board based class D as the one closest to their Benchmark AHB2 in terms of distortion performance? And Purifi is considered more state of the art than ICE. Just saying.How Loud is the Distortion from Your Power Amplifier?
We took Stereophile's THD+N plots for 7 top-rated amplifiers and replotted the data to show the loudness of the distortion and noise at the listening position.
Because the nerdy point of view for visual clues just can't unsee the nice charts some amps do (usually class AB ones, but others too like the Topping class B, etc) .
That sounds good, what company did you buy those Purifi's from? Thanks!
In a fact-based world, yes. Planet Audiophile is of course in a different dimension.
Your subjective perception is noted, but to me, it sounds like the opinion of someone used to distortion and coloration when listening to a transparent amp.
Feel free to believe what you want, but as an engineer, I prefer evidence-based science. By the way, I hope you realize this is Audio *Science* Review, not Audiophiles Anonymous.Must be because we cannot notice 39dB of distortion baked into sound.
What, in your view, makes an amp sound "magical", and is that better than accurate and transparent?
If you want near Purifi-grade measurements but also frequency independent distortion figures with gobs of power there's also Mcintosh for a higher price:Sure. I believe you. /s That's why I keep going back to using class AB amps, I gave opportunity to so many class-d amps, always sounded weird, bass dry, no air around instruments, no soundstage that envelops, no bloom. Must be because we cannot notice 39dB of distortion baked into sound.
I took out and connected a Trends TA10 amp with its Tripath TA2024 chip the other day, that thing does sound magical. Alas, only 5W.
What makes it sound "magical?"
