Class D Technology

George im guessing you should be looking at specs and data of the Rowland amp not the ice module it uses alone. I’m pretty sure Rowland like others do things like beefed up power supply to achieve performance. Again I think you are selectively choosing your facts and data to support your case. Are you a lawyer? Many of these amps get rave reviews and are happily owned by many. Your technical case for why these must sound bad does not add up. Plus I can assure you the newer good ones done right are right up there. It’s ok if not your cup of tea for whatever reason. But that’s about it. If I had listened to the skeptics a few years back rather than drawing my own conclusions to take he chance I’d have maybe missed out on years of enjoyable music by now.   

The output filter vs switching noises frequency is the bottleneck for Class-D HF distortion and low impedance drivability.

As I said when in the future when it is not a bottle neck, and the switching frequency is much higher, I too will dump the hot inefficient boat anchors and go Class-D.
But today it doesn't compete with good linear s/s or even tube (especially OTL tube) which has other limitations.

Cheers George 

D = duck.

I love duck!

The output filter vs switching noises frequency is the bottleneck for Class-D HF distortion and low impedance drivability.

It is ill minded and made up.  There are many amps that have similar bandwidth and great reviews.  My tiny amp is listed as 3 ohms minimum and it drives 3.6 ohm min. Hyperion HPS-938 speakers.  Larger modules, like one used in mapman's amp, can drive 2 ohm (this module can deliver 40 amperes for 0.5 sec and 36 amperes for 1s - not many amps can even do that).  One of our audiogon friends uses class D amp (H20) with Apogee Scintilla in 1 ohm mode with great results.  Please stop making pseudo-scientific reasons - it is not funny anymore.