Cylinder Spectrum
Ya know, that long ago, I'll bet they actually used bricks in their brickwall filter!
(Looks like an mp3 artifact to me...)
Howie
Howard Hoyt
CE - WXYC-FM
UNC Chapel Hill, NC
www.wxyc.org
1st on the internet
Done a small analysis, if you don't mind...100 years after, we have one freq. decade below, one decade above, and sharp cut-off
Ya know, that long ago, I'll bet they actually used bricks in their brickwall filter!
(Looks like an mp3 artifact to me...)
Howie
Howard Hoyt
CE - WXYC-FM
UNC Chapel Hill, NC
www.wxyc.org
1st on the internet
It definitely is the mp3 artifact. But if it was CD, you would again see it at 21kHz, with same steepness. What is worse with mp3 is the fact that the mp3 cut-off frequency moves during reproduction. In this case, it affects only noise - but - it modulates the noise BW! And it is a very bad practice.
MP3 artifacts
You are preaching to the choir here, Pavel! I have given classes at WXYC where I demonstrate the audible differences between .WAV files ripped (correctly) from CDs and differing bitrate MP3s. I do this because these days our DJs are bringing in music to broadcast on the air on iPODs, laptops and phones, and many if not most are unaware of the sonic sacrifice.
Amazingly enough after a few minutes of training their young ears to hear the difference, when you finally play snipets of the WAV vs MP3 many become upset that they have so many low-bitrate songs in their devices.
It is my opinion that MP3 was an ingenious bridge technology when storage and bandwidth was expensive in the 1990s. But as a technological necessity it's time has passed, and there are better lossless formats available. Unfortunately MP3 is so damn entreched it will not go away. As such it is an inflection point in the history of audio: the time when fidelity dropped (probably semi-permanently) in a new format instead of either being maintained or improving. The same goes to phone audio quality: when using the ubiquitous WE500 set at each end of an old land-line system it was positively hifi compared to today's cell phones.
We have thrown the Benny (Goodman) out with the bathwater in the march towards convenience...
Howie
Howard Hoyt
CE - WXYC-FM
UNC Chapel Hill, NC
www.wxyc.org
1st on the internet
You are preaching to the choir here, Pavel! I have given classes at WXYC where I demonstrate the audible differences between .WAV files ripped (correctly) from CDs and differing bitrate MP3s. I do this because these days our DJs are bringing in music to broadcast on the air on iPODs, laptops and phones, and many if not most are unaware of the sonic sacrifice.
Amazingly enough after a few minutes of training their young ears to hear the difference, when you finally play snipets of the WAV vs MP3 many become upset that they have so many low-bitrate songs in their devices.
It is my opinion that MP3 was an ingenious bridge technology when storage and bandwidth was expensive in the 1990s. But as a technological necessity it's time has passed, and there are better lossless formats available. Unfortunately MP3 is so damn entreched it will not go away. As such it is an inflection point in the history of audio: the time when fidelity dropped (probably semi-permanently) in a new format instead of either being maintained or improving. The same goes to phone audio quality: when using the ubiquitous WE500 set at each end of an old land-line system it was positively hifi compared to today's cell phones.
We have thrown the Benny (Goodman) out with the bathwater in the march towards convenience...
Howie
Howard Hoyt
CE - WXYC-FM
UNC Chapel Hill, NC
www.wxyc.org
1st on the internet
That is definitely a point in his setup, although there are good arguments why this vertical uncertaincy might be not a problem (as a variation like that introduced by the smaller displacements was not detected in earlier studies) , or otherwise it would imho be very interesting too, if the reason were given by the vertical dispersion.
But of course it would make a nice confirmation if in a setup with the same proper aligned loudspeakers the delays were realized electronically for the upper speaker. The setup would be unfortunately a bit more complex.
I don't see the point on the Blowtorch thread. In truth, it is not really which approach one might make to make a preamp, as much as it is to make the most linear circuits possible (open loop) with the possibility of using feedback if necessary for some reason. It is about minimizing distortion in individual parts and using selected passive parts that have been shown to both measure and listen well.
Where these two amplifiers different designs toally or were they built similarly to compare circuit performance? An apples to apples experiment or more of an informal comparison of two different amps?
Mike
In my experience how well a circuit functions is directly correlated to the electrical environment it operates in. It could be considered as the x-factor that makes a NAD 3020 stand out as musical and a $150K engineering masterpiece sound cold and analytical. Just a thought.
Mike
I know, but I wondered why PMA raised this point on a recording that has little content above a few KHz.
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