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Old 5th February 2013, 04:37 PM   #3641
generg is offline generg  Germany
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todays little work....

showing the positive k2 phase with Visual Analyser program.
Botte your hints gave me now a more stable phase picture.....
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File Type: jpg phase.JPG (212.0 KB, 368 views)
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Old 5th February 2013, 05:10 PM   #3642
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looks good Generg. I had much easier time getting Arta to work. Played with Visual last night. Tested the F5T and posted results in the build thread. Now time to tackle the f6 again.
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Old 5th February 2013, 05:19 PM   #3643
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nice work generg

Even I can understand the spectra you show.

Is the higher 2nd order vs 3rd order what Hiraga had in mind?

Best

Bob
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Old 5th February 2013, 05:40 PM   #3644
lhquam is offline lhquam  United States
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I have had considerable experience using the Visual Analyser and have a few suggestions.
  • In order to measure harmonics at high frequencies, set the sampling rate higher: at least 96kHz. Sometimes the computer audio system sets the soundcard shelf filters to cutoff frequencies above about 20kHz. Be sure to turn off the shelf filters
  • A soundcard with balanced I/O is preferred. See this thread:
  • Balanced Soundcard Interface for Power Amplifier Distortion Measurement
  • Measure the amplifier output using an oscilloscope or AC voltmeter at 60-100Hz to establish the power level.

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Originally Posted by generg View Post
todays little work....

showing the positive k2 phase with Visual Analyser program.
Botte your hints gave me now a more stable phase picture.....
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Old 6th February 2013, 02:47 PM   #3645
generg is offline generg  Germany
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O.K. Ihquam many thanks for the hints!

A problem concerning me and maybe others, my EMU drivers for Mac do not work reliable at 96kHz or my (older Hackintosh) cannot manage it. ARTA is a good recommendation from friends for Windows, but it doesn't accept the Asio driver from EMU it seems and with the Windows driver it is unstable.
Audio Analyser works in my Windows system fairly good but only up to 48kHz/24bit.

Unfortunately my EMU 0204 accepts only unbalanced inputs!

A friend measured with ARTA his J2 clone balanced and unbalanced, there was no difference in the THD.
Did you experiences in the two different setting?

Now I will read your link!

I will try to find the shelf filter... In windows or in the measurement programs?

Yes I measured the output level at 100Hz!




Quote:
Originally Posted by lhquam View Post
I have had considerable experience using the Visual Analyser and have a few suggestions.
  • In order to measure harmonics at high frequencies, set the sampling rate higher: at least 96kHz. Sometimes the computer audio system sets the soundcard shelf filters to cutoff frequencies above about 20kHz. Be sure to turn off the shelf filters
  • A soundcard with balanced I/O is preferred. See this thread:
  • Balanced Soundcard Interface for Power Amplifier Distortion Measurement
  • Measure the amplifier output using an oscilloscope or AC voltmeter at 60-100Hz to establish the power level.
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Old 6th February 2013, 03:09 PM   #3646
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I successfully used EMU 0404 with ARTA and visual analyzer at 96k 24 bit. Arta is definitely easier than visual, but not as complete a package. EMU Patchmix should be called PainintheAss.
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Old 6th February 2013, 03:25 PM   #3647
lhquam is offline lhquam  United States
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When running at 48kHz/24bit, don't worry about the shelf filter. You won't get anything above 1/2 the sample-rate.

Quote:
Originally Posted by generg View Post
O.K. Ihquam many thanks for the hints!

A problem concerning me and maybe others, my EMU drivers for Mac do not work reliable at 96kHz or my (older Hackintosh) cannot manage it. ARTA is a good recommendation from friends for Windows, but it doesn't accept the Asio driver from EMU it seems and with the Windows driver it is unstable.
Audio Analyser works in my Windows system fairly good but only up to 48kHz/24bit.

Unfortunately my EMU 0204 accepts only unbalanced inputs!

A friend measured with ARTA his J2 clone balanced and unbalanced, there was no difference in the THD.
Did you experiences in the two different setting?

Now I will read your link!

I will try to find the shelf filter... In windows or in the measurement programs?

Yes I measured the output level at 100Hz!
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Old 7th February 2013, 11:48 AM   #3648
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Quote:
Originally Posted by Zen Mod View Post
primarily tnx to my friend with brain (me clueless) - sp300b , here are LTSpice models for both SJEP and SJDP ; one as lib/asy , other one already put in standard.jft

functional , they are .

Just looked at what is in this file. BIG thanks!
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Old 7th February 2013, 08:45 PM   #3649
ra7 is offline ra7  United States
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For me, a more relevant question would be to ask what measurements correlate with audible impressions. For example, by looking at a group of measurements, can you tell how the F6 will sound versus, say, a standard receiver?
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Old 7th February 2013, 08:56 PM   #3650
6L6 is offline 6L6  United States
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By looking at the designer, I'm pretty sure it will sound better than a receiver...


Last edited by 6L6; 7th February 2013 at 09:01 PM.
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