This is written on Audium's website:
Today’s audio power amplifiers only achieve optimum efficiency at full output power. Because a typical audio signal has a very high peak-to-average power ratio, amplifiers operate at less than optimum efficiency most of the time.
Audium’s amplifier technology changes all of that by dynamically adapting the DC operating conditions of the amplifier to ensure that it’s always working at peak efficiency.
Benefits include a 20X reduction in power consumption at normal listening levels*, smaller form factor and a saving on heat sinks. What’s more, the Audium advantage increases with the amplifier output power.
*Normal listening level is defined at 70dBC SPL at 1m with a speaker sensitivity of 89dBC/W/m.
Their technology appear to be geared mainly for portable audio, but they do have products with 100W/channel peak power output. The applications mentioned include battery powered MP3 docking station speaker systems and totally wireless speakers for home and PC audio. Obviously, both of these applications would benefit from more efficient amplifiers.
Here's my question: How do they sound?
I can't find any performance specs, other than peak power output and frequency response. No noise or distortion stats. I doubt these are really intended for high fidelity audio.