class ab vs class d sound
Things like the Emotiva XPA series or the Red Dragon M500M1000 come to mind. If two EL84 output tubes in a Class A design may produce only 10 watts of output power then the same two tubes in a Class AB design might produce 50 watts.
50w Class B Power Amplifier Circuit Power Amplifiers Amplifier Class B
Paul has long said he prefers the sound of Class AB amplifiers to that of Class D but recently PS has launched some Class D hybrids.
. Between a well designed class AB amp Outlaw Aragon Perreaux Cinepro Rotel AB International and a well designed class D amp Crown XLS2500 I dont hear very much difference at all or at least any differences Ive heard could most likely be contributed to the comparison not being blind. Class A topology reproduces exactly what is input just bigger. To me class D sounded smoother and less splashy darker than class AB.
Class B looks to solve that by being more efficient and creating less heat but it is not nearly as accurate. The better Class D amps Ive heard get the tone right but nothing about the presentation is correct. Class B design is a little more efficient but full of distortion.
About Class D Amplifiers Class D amplifiers take it a step further and they are even more efficient and less hot than their AB counterparts. While a Class AB amplifiers efficiency improves as it approaches maximum output Class D designs maintain a high efficiency rating over the majority of their operating range. If you want you system to be really loud use biamping with class D amp for woofers and AB for the rest.
One pair operates class AB while the other slave pair operates class B. Little signal in big signal out. By doing so class AB amplifiers can keep a higher level of audio fidelity closer to class A amplifiers while staying cooler and more efficient like a class B.
Class AB is a traditional amplifier topology that trades some fidelity for some efficiency. Class B design is a little more efficient but full of distortion. That is why a lot of active speakers use class D for bass and midbassmidrange with class AB for the tweeters.
The benefit of this is high fidelity but the downside is that it is inefficient and creates a lot of heat. Midrange was better but lower midrange was leaner had to change speaker cables. Class AB plus B design involves two pairs of output devices.
This setup with active possibly digital crossover wil give gou best sound and let keep sizeweight of eqipment reasonable. Pros for class AB. Most of the electronic amplifiers these kinds of days could be classified into classes.
Modern class D amps are every bit as good as class AB per the measurements and are better in many regards efficiency weight etc. In short it is making a larger identical signal. With an AB on the outputs you have audio frequencies moving around directly where in D the thing is turning on and off thousands of times per second.
I disagree with your first post Matt especially the comment about D sounding like tubes. Up to 17 cash back Class A design is the least efficient but has the highest sound fidelity. Class AB makes the input signal and output signal identical and every step of the way.
Class A amps have greater output than Class AB amps. Class D design has the highest efficiency but isnt quite as. In Class AB you have actual audio coming through the entire amp where in D its converted to a PWM signal at some point.
Lows were tighter while highs initially sounded less extended but they just sound different - cymbals are less splashy. In Class AB you have actual audio coming through the entire amp where in D its converted to a PWM signal at some point. This is a disadvantage to some musicians who are looking for good clean tone at.
Class A design is the least efficient but has the highest sound fidelity. Class AB design offers power efficiency and good sound. My first thought is that a class D would have less audible harmonics.
Whats his opinion now. Class AB design offers power efficiency and good sound. Here the output devices are rapidly switched on and off at least twice.
Has class D switching amplifiers come of age enough yet to seriously challenge the superior sound of class AB amplifiers. A B AB C D F In term of efficiency as well as power reserve Class D amplifiers often prove superior to amplifiers from other classes. Class D operation is switching hence the term switching power amplifier.
Hence many devices and system use amplifiers from Class D such as powered speakers home audio equipment and so on. Class D design has the highest efficiency but isnt quite as high-fidelity. Superior sound quality means better reproduction of the input signal therefore less THD and less intermodulation distortion Generally better design because theyre usually discrete unlike most class D amplifiers which are implemented not designed which leads to better quality components.
Given the common bias against Class D in 2-channel audio it would be interesting to see some comparisons between similarly priced Class AB and Class D power amps. Linearity that makes class AB the most popular audio amplifier design. You need switching frequencies well above 100kHz preferably as high as 200-300kHz or even higher.
I currently have a pair of Schiit gasp. Its a hell of a lot harder to do a good full-range class D amplifier. Never have I thought that.
Ive still yet to hear Class D sound natural but I have heard several AB amps deliver in that category. My first thought is that a class D would have less audible harmonics. As a result real world efficiency tilts further in their favor.
For class D to amplify without distortion the switching of the class D amp must be orders of magnitude faster than the frequency of the highest freq signal to be amplified ie. Class D amplifiers are models of efficiency but with a loss of detail and fidelity Class B amplifiers generally introduce some crossover distortion but move away from Class D G and Hs extreme non-linearity. Class H amps work like AB when signal is low so there is no difference from pure AB amps if you do not use full power.
Class AB amplifiers may introduce some crossover distortion but they get closer to the ideal of Class A for most of its operating regime. Class D amplifiers are very different than class ab amplifiers which are more traditional. It depends greatly on amplifiers used.
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