Nuforce STA200

@mrdecibel

Then I stand corrected. :)

Erik

NuForce uses a hybrid approach, very similar to Carver's idea, and << cough >> borrowed by Yamaha in the EEEngine design. Not sure if Yamaha ever licensed it or waited for patents to expire.

The voltage + and - rails are Class D, and they swing up and down. In between the rails is a Class A or A/B (not sure) linear amplifier.

It's quite clever. By keeping the voltage rails from deviating too much from each other, the power dissipation in between is always limited to a few watts compared to a linear power amp of the same output.

For instance, a 120 W amplifier might have +- 50 V rails. The amp between has to dissipate a lot of heat as a result of the 100V difference. But if the voltage between the two rails is kept small, say 30V, then the heat and size of the amplifier can be made much smaller, with much less wasted power.

Best,

E