Creek Voyage i20 amplifier ... too sexy for it's shirt.

A good stereo amplifier is a lifelong companion and Michael Creek has been designing and manufacturing amplifiers for his whole life.

The new i20 is a bit different .. it is a Class G design

Michael doesn't do class D, he wants the emotional sound rendition of Class A but this six mosfet design with massive power supply runs largely in Class AB ...

Mr Creek explains: “Voyage uses a more advanced version of the Class G output circuit used in the Evolution 100A. The main difference is that the Voyage uses six high-current MOSFETs to lift the power supply rails compared to the Evolution 100A that used four bi-polar transistors, instead.” This improves thermal efficiency; for the Voyage to be pure Class AB and capable of developing the same power, it would need to weigh quite a few kilos more to dissipate the heat generated by the standing bias current.”

Mike explains that Class G – in the form used by Creek – has two power supply rails. “Let's say there is a full voltage rail (upper) and a half voltage rail. When the signal demands higher voltage rails to track signals at higher power levels, the power MOSFETs in the Class G output circuit switch from half rail voltage to full rail voltage. Immediately that peak is passed, the voltage that supplies the bias current drops too. Half the power supply voltage allows for a quarter of the power so in effect it's like having a 120W into 8 ohm amplifier when peak signals demand it, or a 30W amplifier when not producing peaks. So the heatsink size can be reduced substantially. Class G circuitry leverages the dynamic nature of music to reduce wasted heat.”

The i20 makes 120 watts nominal into 8 ohms, and doubles that into 4 ohms, then doubles that again to 480 watts into 2 ohms.