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In Reply to: RE: More posted by Triode_Kingdom on September 02, 2014 at 15:47:32
The general areas just prior to cutoff and saturation, areas through which the tube continues to conduct well, but nevertheless responds in a degraded manner with respect to linearity.
The manual says 2vrms and that's what I remember measuring when playing a 60Hz CD I made in Sound Forge normalized to 0db.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
"The manual says 2vrms and that's what I remember measuring when playing a 60Hz CD I made in Sound Forge normalized to 0db."
Have you looked at the output with a scope to see whether signals created from a standard music CD can exceed that level? I'll do it on mine if you don't have time, they're probably similar in terms of levels...
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Buy Chinese. Bury freedom.
Here a screen shot of the wave form in Sound Forge and a close up showing the peak sample sitting right on the digital "0".
TK, here's the part that maybe, somehow I'm not understanding.
A digital "0" is a digital "0".
There can be no level above that without digital clipping.
If my 60Hz wave form is peaking at a digital "0" and I measure 2vrms with a multimeter, then I think I'm done.
No other non-clipped signal can be higher than that. Sine wave or music waveform.
That's the thing about digital. It has an upper limit that can't be exceeded.
I can look at it with a scope but I don't see the need. If a wave form that is peaking at digital "0" measures 2vrms at the output of the CD player with a volt meter then how can there be any level above that?
Maybe I should measure it again. I seem to remember that it measured just a little over 2vrms and at the time I thought "close enough".
I posted/hosted the wav file at the link below.
Edit, a digital 0 is represented as all 1's for the word for that sample. The D to A converter will output full voltage for a sample with the word written with all 1's.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 09/03/14
Tre', I'm not familiar with the system or software you're using, so I have to ask - are you certain the signal in the upper screenshot represents "all ones"? If it does, then I certainly agree, the amplifier won't saturate. I don't think this inability to clip is representative of most systems, but it's a smart thing to do. The only problem might come about when a CD with a very wide dynamic range is in use, especially if much of the music is at a rather low output level. I often find myself turning up the volume so I can hear the quieter passages in more detail, but that makes the system prone to clipping on peaks. If the amplifier is designed for quick recovery, those brief periods of saturation are much less offensive. Anyway, it sounds as though you've "calibrated" your system so that none of this is a problem. If your speakers have the sensitivity to raise you off the ambient noise floor of your listening environment even at low source levels, it's a good approach. Wish I was that lucky! :)
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Buy Chinese. Bury freedom.
"...are you certain the signal in the upper screenshot represents "all ones"?"
No, just the one sample that touches digital O. The peak, the apex of the wave form.
And as such, that's as much voltage as the D to A converter can output.
I live in a rural area and my house is back off the street. It's pretty quiet here most of the time. People from the city are always amazed.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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