You get excellent sound and excellent specs without generating too much heat. Remember that the concept is from a time (the 90'ies) when decent, let alone true precision class-D amps for audio duty did not exist and were not going to exist anytime soon.
OK, that's about what I thought.
Also revives the old "phase shift through the amp matters" argument that has been hashed out endlessly. A constant delay (group delay) imposes a corresponding phase shift but does nothing to alter the signal otherwise. I know you (among others) remember the big fight about how MHz bandwidth was needed to minimize the phase shift from input to output. That is just not a thing. Not even in the RF world, where designing an amp with 50x the needed bandwidth to achieve some magical in-band phase integrity target would likely get you reprimanded if not fired for incompetence.
I kind of figured those schemes were only used for Pro Audio, when fidelity was not the prime concern. But now class D has pretty much taken over.
No, they were rampant for a while in the consumer audio world, and there are a number of designs similar in nature (at least at a high level) in production today but the problems have been (mainly) solved. A.la. Benchmark's AHB2 among many others. It is possible to do it right, and usually is these days (I would hope!), but not something I really follow anymore. I do not know the penetration of class D into consumer home audio these days. Certainly significant, but a lot of current receivers, amps, and AVRs still use AB/G/H power amps so I don't know the percentage. That'd be interesting to know. Judging by other fora and magazines (which I no longer receive since the first of the year), class A and AB still dominate the mystique of the very high end (or at least very expensive) players.
My gut feeling is 1 MHz would be somewhat less of a concern than would be passing DC to one's loudspeakers... assuming regular old electrodynamic drivers, that is.
Yeah, of course it does ;-) The usual marketing BS. However, they don't explain the basic working principle of the amp in the marketing, that's why I tried to answer this question:
Note that this bandwidth is specified up to a few watts.
Does it really matter? If this is the best it can do in optimal conditions, we already know that way cheaper amps can do much better. It's always interesting how the target audience can be wowed by large numbers like Watts and Amps, but are totally indifferent to distortion numbers. I guess the transition to SINAD as a numbering system is actually helpful in this, because now, more means better
I showed my Mini 300 the J2. It was unimpressed
Thank you, only product available at this time, with that link, is a preamp so not ClassD, is it, but could be like Devialet Digital Pre Technology, couldn't it? They do not indicate what the Digital output is, do they.... @Vhond, perhaps you could ask them/ella and let us know :=)
To ask.... as BW is not indicated, could this actually be refering to the SF/Switching Freq. If Yes, then this suggests GaN output, wouldn't it, perhaps with a (Generator/Comparator/Gate Driver) twist? If No, then (perhaps) they are possably refering to some type of (output) HF/etc Cancellation Method, as mentioned by @Hayk. Without knowing the Topology, can only guess?
No. Small-signal bandwidth is specified as it sounds, for a small output signal, before the output stage requires large slewing for large signals. It varies by manufacturer but bandwidth at 1 W for a power amplifier used to be a typical number. As power goes up, bias current and output drive limit the available bandwidth for large signals up to full output power. Nothing to do with power supply or class D output switching frequency. In this case, it is the bandwidth of the low-power class A amplifier stage.
They're not marketing to us, that's for sure.
Maybe, perhaps amir will get to test/measure this amp then we will know a little more, won't we :=)
Someone will have to "invest" 14K to find out the truth.
