Class A/B vs. Class D power for Subs

[smd4life 5,000+ posts]

lol at your sig...

 

[DBfan187 5,000+ posts]

I'm giving this thread a rating of 5 for hilarity.

 

[thch 10+ year member]

atoz350, you have some odd information about amplifiers. you have the "phase" thing a bit wrong. that derives from a sine wave test. in such a test, the N device (controlling positive output) will be active for more then half of a cycle. the P device (controlling negative output) also will be on for more then half a cycle. this means the N and P devices are active for some overlap. this is the class A part of class AB. basically for a small postivie output, the N device is active, and provides more current then the P device sinks -- the excess current goes to the load, but both the N and P device are active. for larger outputs, the P device turns off and the N device fully takes over.

in pure class A, the N device and P device are both always active for the entire wave.

class D is a different topology and the issues are different.

*N and P come from the doping of the semiconductors, not "negative" and "positive"...