Reply to thread

Message

<blockquote data-quote="Ge0" data-source="post: 3689462" data-attributes="member: 582277">Myth buster time.I challenge you to tell an audible difference between modern day D-class amps such as the Alpine PDX series, Class A, and Class A/B.&nbsp; Distortion figures are so low in all cases that your ear can&#039;t discern the difference.&nbsp; They only way you could possibly hear a difference is if you wanted to and your mind tricked you into thinking it did.&nbsp; Therefore, no one can tell for sure unless you do true ABX type testing.Myth Buster #2Any class A/B amp can be run pure class A if biased properly.&nbsp; You know that little pot on the amp that says DON&#039;T TOUCH!&nbsp; Well, this sets the bias of the output stage.&nbsp; Crank it up so the output devices operate midway into their linear range and you now have a class A amp.&nbsp; Just make sure the amps heat sink can handle the thermal load.&nbsp; Class A amps dissipate the most power at idle.There was NO difference in the amps output stage design between the Soundstream reference series and Class A series.&nbsp; The only difference was the voltage available at the power supply rails.&nbsp; The class A amps were lower power since the heat sink could not tolerate operating at the same power levels as a identically designed class A/B amp.And there you have it...Ge0</blockquote>

[QUOTE="Ge0, post: 3689462, member: 582277"] Myth buster time. I challenge you to tell an audible difference between modern day D-class amps such as the Alpine PDX series, Class A, and Class A/B. Distortion figures are so low in all cases that your ear can't discern the difference. They only way you could possibly hear a difference is if you wanted to and your mind tricked you into thinking it did. Therefore, no one can tell for sure unless you do true ABX type testing. Myth Buster #2 Any class A/B amp can be run pure class A if biased properly. You know that little pot on the amp that says DON'T TOUCH! Well, this sets the bias of the output stage. Crank it up so the output devices operate midway into their linear range and you now have a class A amp. Just make sure the amps heat sink can handle the thermal load. Class A amps dissipate the most power at idle. There was NO difference in the amps output stage design between the Soundstream reference series and Class A series. The only difference was the voltage available at the power supply rails. The class A amps were lower power since the heat sink could not tolerate operating at the same power levels as a identically designed class A/B amp. And there you have it... Ge0 [/QUOTE]

Verification