Re: Class/type of amp ?


"Trevor Wilson" <trevor@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
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"N_Cook" <diverse@xxxxxxxxx> wrote in message
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Before wrapping up a Mackie SRM450 powered speaker I took some
representative DC voltages on the complementary pair power devices of the
bass driver amp, for me and all else, future reference.
-42, -88, -42.8
41.2, 88, 42
What would the circuit type/ class name be, for this sort of biasing?

in comparison for horn side amp, same devices
0, -43, -.55
.55 , 43, 0

**There are only Class A, Class A/B, Class B and Class D amplifiers used
in audio. Anything else is just marketing bull***. What you have is a
Class A/B amp, with a switched rail power supply. Class H, Class G, et al
are just marketing terms.


--
Trevor Wilson
www.rageaudio.com.au


Well, you could say that about almost anything. There are many manufacturers
that would disagree with you that it is just marketing bull***. In fact I
can't remember ever seeing anywhere that a piece of regular Joe hifi has
ever been marketed as class G - or even class A/B. I see nothing wrong at
all with giving a derivative of an existing class, a new letter. Whilst
class G is indeed a switched rail class A/B amp, it never-the-less is
different from a fixed rail class A/B amp. Based on what you're saying, you
might as well say that class D is an invalid term, as class A and class B
and class A/B (and for that matter class C at RF as well) refer to the point
that the output devices are biased to in normal operation, whereas class D
refers to an entirely different concept of waveform reconstruction by power
device switching i.e. the fully digital output stage.

Arfa


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