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In Reply to: RE: Not all Class D amps use SMPS. (NT) posted by A.Wayne on December 26, 2016 at 13:27:54
It is about class D amps and they can be powered in different ways.
Follow Ups:
Kal ,
It's academic, the noise in discussion is emitted by SMPS supplies , not the amp, hence why PSRR is so important with them.
you can power class-D on batteries for all that ...
You are correct but the fact is that, while the majority of ClassD amps use SMPS, not all do.
Nonetheless, when one generally speaks of a ClassD amp, one is referring to the audio amplification portion and, as we agree, the PS can be SMPS, conventional linear or, even, a battery. This distinction has not been explicit in this thread before and, as you point out, should be.
Switching power supplies do not have to be noisy. Check out this link from Benchamrk on the subject. Their DAC's, as well as the AHB 2 amps sound very good, with very low noise floors, and switching power supplies.
When a company like Primare states that they can achieve better sound from their Class D vs. Class AB, that should tell folks that technology does indeed move forward.
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
It's audio Freo, better for whom ..?
Too much subjectivity with sound , best we stick with SMPS noise and PSRR with amplifiers ... :)
Personally ,
I find Class-D to be super sensitive to power cords, the noise going back unto the AC line can be measured so it's not a subjective deal, one can always chk or not.
Pro: I have always liked the jump factor of class-D and always willing to try because of , but could never live with their poor timbre and for some, a odd presentation and no i have not heard the Bel Canto black or Mola , Mola ...
I did like the Devialet mono's, which is not all class-D ..
Regards ..
Did you read the Benchmark link? They believe that their switching power supplies are actually quieter than linear power supplies. The points they make about hum and magnetic interference are valid.
The Primare uppeer frequencies/timbre is unique among the class D amps I've heard. Their solution is proprietary, and works as good as a well designed Class AB (IMHO).
BTW, when I want to do serious listening, the Stax headphone setup (with SR 007) is what I use. I find it's superior to pretty much any regular playback setup. :-)
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
This may or may not be true, it could also be nothing more than an Infomercial from the CO and since I dont design amplifiers, i usually yield to others better than I, like John Curl and Nelson Pass to name a few and unless their position on this has changed recently , they think SMPS are a problem and prefer Linear supplies as I and I'm not new to switchers either , my first was for my bespoke Pre-amp in 78 , the pre-amp had a fantastic sound , but others could hear it switching , when close to it , i had isolated it to the AC line via a 14V linear supply the SMPS delivered 24 volts to the flat amp and phono stage when supplied with 14 volts ..It Bettered all my threshold pre's, a MC22 and was only bettered later by a ML26 pre in the late 80's ..
I still have it , so I'm not switching negative , just not sold on any superiority over Linear designs as of yet.
I have no issue purchasing a switcher, purchase will be based on performance , not because of ..
Regards..
Edits: 01/15/17
Until recently, always thought that switching power supplies were problematic. The Benchmark DAC 2 DX has better noise measurements than the vast majority of DAC's available. I think the point paper Benchmark put out on switching power supplies is valid, using state of the art devices and designs.
Agree with the statement that performance of the gear is the most important, regardless of design topology. Having said that, nothing I've heard so far sounds better than listening to music with the Stax headphone setup.
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
Theta Prometheus/Dreadnaught
Classe Sigma Mono
...in addition to the Mola-Mola and Bel Canto.
They are quite different.
Agree. I'm currently using a a pair of Primare A34.2 amps configured in mono. The Primare has switching a power supply, and it's very quiet. The fact that it can put out 1100 watts into a nominal 4 ohm load of my Dynaudio Focus 360's really makes them sing. I highly doubt folks would pick up on the fact they are class D, as they sound very much like a top performing Class A A/B setup.
BTW, Benchmark has a point paper about the switching power supplies in their DAC2/3 units. They state the noise floor is LESS with the switching power supply units in the DAC. I can attest to the fact that the Benchmark DAC2 DX provides a DEAD quiet background for the music.
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
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