Confused by ICE applications

Magfan - IR published paper (google it) on class D with complete design (schematics, PCB etc). Your Maggies are power hungry and Icepower might be a good choice.

I agree. ICE power would and IS a good choice for my Maggies. I use the PSAudio GCC250 to good effect.
I think, however, you've got it a little backwards.
You can buy the ICE modules or the ColdPower or any of 'em and than be responsible for the Power Supply yourself.
The IR unit, for example, needs up to about +-35v, so 5x6v GelCells would work fine.
Oh! I work for IR and have spoken with the designers::

Magfan - why not to buy Icepower modules with power supply built in like 200ASC? Switching power supply, when done right, can be better than linear one (also smaller and cheaper)

My understanding is just the OPPOSITE.
Manufacturer of the module makes the output/driver section and the USER supplies the power....be it SMPS or a nice big Toroid and a large selection of caps.
I will investigate if the ICE modules have an integrated PS. I know Cold Power and IR stuff DOESN'T.
It seems that if you bought a BUNCH of modules and were willing to warranty them, you could pretty much do as you please....change stuff for 'better' sound or even proprietary reasons...My GCC uses GainCell technology on the input side, for example and has some unique (selling point) claims.
If all ICE module users were using modules from the same menu, they'd all sound VERY similar.

Magfan - about half of Icepower modules have built in SMPS including mentioned 200ASC used in Rowland's 102, Bel Canto S300 and PS Audio Trio.

SMPS can put as much power thru 2" toroid at 100kHz as 10" dia, "big nice Toroid" at 60 Hz. In addition 100kHz is not audible and easy to filter out while 60 Hz is audible and difficult to clean. SMPS is regulated while linear power supply is not.