To me GaN is a lot of hype and I am yet to see it's ultra low distortion turn to reality.
What about the Technics SE-R1 which utilizes the faster 1.5mHz switching speed and higher filter available to GaN users, instead of Mosfet with 3x lower switching speed and filter?To me GaN is a lot of hype and I am yet to see it's ultra low distortion turn to reality.
To me GaN is a lot of hype and I am yet to see it's ultra low distortion turn to reality.
There is a lot of hype that because of the faster switching rate the distortion is a lot better than conventional class D. Sounds good, but I am still waiting to see a measurement proving this beating a Purifi amp.why is that?
Sounds great on paper. Where are the measurements?What about the Technics SE-R1 which utilizes the faster 1.5mHz switching speed and higher filter available to GaN users, instead of Mosfet with 3x lower switching speed and filter?
That's what the new Technics-SU-R1000 would appear to be doing - it should be out by the end of this year.When you design a Class-D amplifier though you don't want any higher switching frequency than is required to meet the performance requirement as losses increase with increased switching frequency. As Purifi has a maximum switching frequency of 500kHz this would seem sufficient (using their modulator) for any GaN amplifier. What switching to GaN in this circumstance gives you then is lower switching loss and cleaner switching events (reduced EMI).
On the left it's difficult to judge since there is no vertical scale, but this is anyhow only a problem for the certification of the product, as a user you don't care.This is the new Technics SU-R1000.
I am not sure how some of these figures compares to the Purifi?
View attachment 95248
Technics quote: 300W + 300W (1kHz, T.H.D.0.5%,4Ω, 20kHz LPF)On the left it's difficult to judge since there is no vertical scale, but this is anyhow only a problem for the certification of the product, as a user you don't care.
On the right I fear that the curve is worth nothing because the FFT size is unknown. With a big FFT size, I can give you a curve from my amplifiers with a noise level at -140 dbV if I wish. The only thing we can understand is that the orange is a lot cleaner than the blue one
There is a lot of hype that because of the faster switching rate the distortion is a lot better than conventional class D. Sounds good, but I am still waiting to see a measurement proving this beating a Purifi amp.
Sounds great on paper. Where are the measurements?
No remotely near purifi, not even in the same universe probably.Technics quote: 300W + 300W (1kHz, T.H.D.0.5%,4Ω, 20kHz LPF)
The brochure below is quite informative regarding areas like - not feeding back the original signal but only the distortion component.
And correcting problems associated with the variation in inductance of the speakers and the output filtering.
The product brochure can be downloaded by clicking the amp image here:
https://www.remusic.it/EN/New-Technics-SU-R1000-Reference-Class-integrated-amp-98dbd700
I may be wrong, sure, but as of today I am still waiting to see GaN being the decisive factor that makes a class D amp measure a lot better than everything else... And I have not seen it yet.your hype comment only applies to the implementation - if at all
not to the technology itself
I may be wrong, sure, but as of today I am still waiting to see GaN being the decisive factor that makes a class D amp measure a lot better than everything else... And I have not seen it yet.
It would be interesting to have a side by side comparison between the Purifi and the Technics - both Class-D but coming at it from different technological perspectives. I have heard the Technics via a YT video and it sounds amazing on my $10 computer speakers...No remotely near purifi, not even in the same universe probably.
For acceptable sound 1% distortion is mostly fine. The objective performance is hundreds of times better on purifi. It's like comparing a boat to a ship.It would be interesting to have a side by side comparison between the Purifi and the Technics - both Class-D but coming at it from different technological perspectives. I have heard the Technics via a YT video and it sounds amazing on my $10 computer speakers...
Thanks for this.Technics quote: 300W + 300W (1kHz, T.H.D.0.5%,4Ω, 20kHz LPF)
The brochure below is quite informative regarding areas like - not feeding back the original signal but only the distortion component.
And correcting problems associated with the variation in inductance of the speakers and the output filtering.
The product brochure can be downloaded by clicking the amp image here:
https://www.remusic.it/EN/New-Technics-SU-R1000-Reference-Class-integrated-amp-98dbd700
Thanks for the feedback - so do you think that the way forward is the Axign way with ADC feedback + internal (self-oscillating) solution for modulating the signal +GaN ?Thanks for this.
I initially didn't look at the performance data and was positively interested in seeing another class D with feedback handled with an ADC.
The issue is that in opposition to Axign (https://www.axign.nl/) they stay stuck on the external oscillator solution for modulating the signal. This means that to keep the amplifier stable in all conditions, the loop gain cannot be above 3 to 4 dB, which is extremely low. So is the performance of a class D amplifier with such a loop gain. So on objective performance, this amplifier just doesn't hold a candle against Purifi, Hypex, some TI chips, and others...
But it's a beauty
I am not pretentious enough to think I know the way forward .Thanks for the feedback - so do you think that the way forward is the Axign way with ADC feedback + internal oscillator solution for modulating the signal +GaN ?
Thanks for this.
I initially didn't look at the performance data and was positively interested in seeing another class D with feedback handled with an ADC.
The issue is that in opposition to Axign (https://www.axign.nl/) they stay stuck on the external oscillator solution for modulating the signal. This means that to keep the amplifier stable in all conditions, the loop gain cannot be above 3 to 4 dB, which is extremely low. So is the performance of a class D amplifier with such a loop gain. So on objective performance, this amplifier just doesn't hold a candle against Purifi, Hypex, some TI chips, and others...
But it's a beauty
Well, I had a response asking for potential volumes, and then I ceased to existI also asked for a datasheet from an email which should have weight and didn't get a response.