Wow... since this video claimed 2 ohm operaton as the "elephant in the room", and they are claiming as a statement of fact that these modules (and their competitors) do not really operate at 2 ohms... this is absolutely incorrect. There are several designers using the same modules that have amps with a long, reliable and successful history of guaranteed and safety certified 2 ohm operation. I'm thinking Mesa Subway D-800, D-800+, WD-800, TT-800, Genzler Magellan 800, Aguilar AG700, TH-700 right off the top of my head. To suggest that other designers are disingenuous with their claims of 2 ohm operation is unfortunate and actually rather insulting, though it probably wasn't intended to be.
To be successful designing around 2 ohm operation, the designers need to really understand the technology behind the power supply and power amp. I can back up my approach with a US patent (shared with Jeff and Scott at Genzler) specifically addressing off sheet (4 and 2 ohm) applications of ICEPower modules. This approach was also approved by ICEPower which insured that all warranty coverage would remain in effect throughout the life of the product.
Understanding the technology (class D and switchmode power supply) includes acknowledging the inherent difficulties and complexity in achieving the necessary performance regardless of the rated load impedance, as well as maintaining high reliability under such conditions. Looking back, there examples by several manufacturers where this has not held true.
