What exactly is the ICE module in digital amps?

I was asked to evaluate the sound by a manufacturer and didn't care much for it, but thought it would be great for rear channel or woofers.....It runs cool and is a small module for such a powerful amplifier.....

Sean, Parasound send me a 250w unit about a year and a half ago to evaluate and recall the stereo board was maybe 6" x 8" and had a huge transformer that came separate and plugged into the board....Input and output jacks were on the board BTW.....Made everything sound like elevator music to me used with the rest of my system.....Imagine it would be fiddled with to get more out of it as most things can, but recall it didn't measure well either with higher order odd harmonics going out to channel five.....I saw limited use of the module as I said for woofers and rear channels and a conventional amp used for the main speakers.....No heat and little to make it run so you could have three of these in mono form in a five channel amp.....