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A 9 watts beats Passlabs, EAR and YBA ?

Over the weekend, I have listened extensively to the following four different amplifiers and I have decided once and for all that the SET 300B, no negative feedback is the way to go.
The four amplifiers are as follows:
Passlabs X150: very neutral, powerful yet the sound almost very sterile.
EAR 834: very musical, tube mid-range yet sound the least like live music.
YBA 2 High current, Double Transformers: very musical, soft and sound very enjoyable; yet again not like live music.
Audio Note kit one: This is a killer and provided the music is limited to vocals and chamber music. Very good mid-range with good attack and the best like live music; but not very much bass.
However, this listening session made me to want more bass with the SET.
Thinking about the Cary 805, deHavilland or Atma-sphere ?
Any comment ?
Please advice
robertwolfee
eldartford
4,262 posts
 
Atmasphere...True... if the feedback signal had gain increasing with frequency reduction the overall amp would exhibit LF roll off. But that would be easily corrected by equalization of the input signal.

But the causial relationship between propagation delay and odd harmonic distortion still eludes me.
atmasphere's avatar
atmasphere
11,931 posts
 
Eldartford, you mean, 'How come the propagation delay in an amplifier causes odd-ordered enhancement and not even ordered?'

To answer this I think you have to look at the components of a square wave -odd ordered harmonics- and then look at what happens when you add a delayed inverted signal to the original signal. The result has a bit in common with what happens to a sine wave when you start adding odd-orders to it- it makes the resulting waveform wider on top and bottom, without changing the frequency. I think the only way you can interpret that is 'odd orders are enhanced'. My take on it anyway...
eldartford
4,262 posts
 
Atmasphere...Thanks. I still don't get it, but am willing to believe you are correct in your conclusion. Until I run a little simulation anyway :-)
atmasphere's avatar
atmasphere
11,931 posts
 
Eldartford, I'd love to hear about your results!
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