Choosing several Class-D amplifiers for my active 4-way loudspeaker

[Sokel]

Thank you Sokel, I most likely would never have stumbled across that thread! .

One more question: What is the consensus out there about heat sinking or airflow requirements for the 1200AS2? What's the real-world temp rise experienced on that module when mounted in a non-vented or limited vented enclosure? I will be building my own "plate amp" of sorts for these modules, together with the DSP I/O board I'm making (balanced input-->DSP-->4 channel balanced output board, diagnostics/protection). I just want to make sure I have a sense from the community about these module's temp rise.

At normal playback at my setup it has reached about 45-50° C and that with demanding (music) material.
I have them on comparable to their size (so no small but no very big either) heatshinks on 2U cases.

Mind you, they can act strange (at least in my setup) as they can have a steady 40° C doing nothing and get to 35° C playing background music at 65-70dB SPL (A).
For your application (high power+low impedance) I would suggest to stick the biggest heatshink you can fit on the outside of the plate, as you would do for any high power amp.
For insane use you could include some active solution too firing up if temps go upwards of 60-70° C but I don't think you'll need that, you'll see.