@kosst_amojan - not entirely correct. The major problems with driving low impedance loads (such as .5 ohm or 1 ohm) are the power supply. Car audio is completely different because the power supply is a constant big 12V DC battery (and an alternater that continuously charges it). There isn't usually that much of a power supply capacitor bank in car stereo amplifiers because it is being fed by DC. (you should know this). Then it becomes a factor of designing the circuit so that it won't over-run based on the current requirements of such a low impedance - fed by a 12V DC power source.
With home audio, it's all based on A/C current, which only provides partial current in cycles of 50-60 hz. Obviously, that's why we have huge capacitor banks in larger amplifiers. The ability for the amp to drive low impedance loads is hugely dependant on size of transformer and capacitor bank (which you should know as well, based on your historical statements that you are very much an expert in analog electronics).
I have seen many Class AB amps in the car stereo industry that will run .5 or 1 ohm loads. It is not limited only to Class D (however, there is definitely a large amount of Class D in the car stereo industry today).
Class D has its own fanbase, but the limitations on bandwidth due to the high switching in the circuit prevents it from really performing well in the ultra high frequency range and giving you that "air" and liveliness that Class AB amps provide.
