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tom daghdha 22nd April 2008 03:28 PM

Amplifier Classes Survey
Hey guys

I'm sorry if this seems like spam but it would really help me out

I'm doing a research paper on perception of amplifier classes, and I've made a short survey (9 questions) on amplifier classes.

If anyone would be able to complete it it'd be really helpful :)

joetama 22nd April 2008 11:53 PM

Filled it out real quick for you.

I'd like to see the results when you are done.

gni 23rd April 2008 02:17 AM

I'll do it. . .please. . . yes. . .post results. . . could be interesting.

When you post your results it would be interesting to see what
you thought the answers would be and explain the difference. . .

gain 23rd April 2008 05:12 AM

done. good luck on your paper!

fizzard 23rd April 2008 05:49 AM

What exactly is the difference between AB and B?

Mooly 23rd April 2008 11:30 AM

Class B can be more linear - Now work that one out :D
Any textbook will show class B as being where the output devices are cut-off under quiescent (no signal) conditions, that is the correct definition and this means high distortion at the zero crossing point. At what point does class B become class A or AB1. Technically a quiescent current of "greater than zero" is class AB as there is some overlap in the conduction angle of the output devices. I would call it class B however up to say 40 or 50 ma. A current of 150ma I would call class AB, and there are no recognised standards as far as I am aware.
Hope that helps, or has it added to the confusion :)

lumanauw 23rd April 2008 03:51 PM

Hi, tom daghdha

Interesting survey. What is this survey for?

tom daghdha 23rd April 2008 07:10 PM

Hi there guys

It's for a university research project, I'm studying the perception and understanding of amplifier classes, basically to see what people what in an amp depending on application.

I've posted this on a couple of Pro Audio forums (I work in Live Sound / theatre as opposed to anything DIY) and there's a decent comparison of live sound guy's understanding on amplifiers compared to audiophile's understanding.

At the moment I've got the raw data results in an Excel spreadsheet, I'm not sure if there's a way to publish the stats ones online.

What I was looking for was any correlation of preference of amplifier class depending on application, or if the respondent doesn't understand classes, just the features they would prefer. I'm surprised how open Audiophiles have been to Class D, I would have thought you guys would have been against that. Live guys love them though, and noone of them would take a Class A, as for the size of the application it'd end up far, far too heavy en mass.

I've had about 70 responses so far, really pleased with that! About 20 Audiophiles, 40 sound guys, 5 guitarists and a couple of DJs.

tom daghdha 23rd April 2008 07:11 PM

Just to add - I've built valve amps before though, as they were simpler than solid state amps, but after this paper I'd be interested in building one from scratch as well.

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