Yes, I make a big deal about using class AB for my power amps to the mains of my Larger PA system. There is a reason for that, see I am all about what sounds the best. That amplifier is also all analog, no AD/DA (digital) conversions. It uses (throws away and totally wastes, btw) more power than a Class D. So it's not as efficient either. This may seem like an odd preferred choice.

     I do not want AD/DA converters touching the signal and taking a chance on degrade. Although, these days this is probably not as strong of a concern. The quality of converters has risen drastically over the years. I personally still do not take any chances. The power amplifier stage is a real sensitive choke point for quality, it degrades everything from there.

     Now, class AB gives you both positive and negative rail for amplification, that are "on" most of the time. It takes that signal clean rip and juices it on both sides of the polarity.  When looking at a waveform, above the middle line and then below the middle line is positive and negative sides of that polarity. There is a power rail for each side, it gets combined. I may take a photo of the power rails in the Crown amp, they are beastly.

     Class D works by Pulse Width Modulation, it's pumping out current from voltage snapshots that have the same waveform as the signal. It has been changed slightly, there is some noise, no one can deny that. It is going to get that Class D hiss. They are substantially better at power consumption, and that noise can be filtered out. They are the preferred amplifier for car audio for their smaller size also, and less expensive. They work great on subwoofers. I use them for my stage monitors; they are self powered and that amplifier is contained inside the cabinet. As a result, they need to be smaller and lighter, also they are not required to reach the full high fidelity sound quality that is being sent out to the audience.