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Old 29th July 2013, 07:48 PM   #11
ghg is offline ghg  Austria
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Perfect, now a new teaser:

Switched the E-MU 1616m to 48kHz and tweaked the notch depth a little bit,
so Victors 1kHz gives now h2 ca. -150dB, h3 -153dB ( see the math #1 )

BR

Gary
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Old 29th July 2013, 07:56 PM   #12
1audio is online now 1audio  United States
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I checked a 1K 10 turn pot and no measurable inductance or capacitance of significance below 100KHz. A good wirewound pot with a good contact material should have the lowest distortion of any pot.

I'll fit mine up with this as well.

The spurious stuff in the plot is from the 1616 power supply?
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Old 29th July 2013, 08:03 PM   #13
richiem is offline richiem  United States
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Just tune the notch to exactly -60dB and then add a couple of zeros to ARTA's calculated values. Don't forget to turn on the 400Hz HP filter in ARTA.
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Old 29th July 2013, 08:05 PM   #14
ghg is offline ghg  Austria
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Well, think so, 50Hz power line, but the switch mode PS of the E-MU has a nasty 60 kHz ( switching f ) spike too, tomorrow I'll fire it up using 4x12V SLA's.




>The spurious stuff in the plot is from the 1616 power supply?
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Old 29th July 2013, 09:26 PM   #15
ghg is offline ghg  Austria
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Victors 10kHz


h2 ca. -139dB
h3 ca. -145dB


Gary
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Old 29th July 2013, 10:25 PM   #16
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I checked the EMU 1616. It uses the AK5394A ADC. That's a key part of how it gets the low noise. I just bought one on eBay to see how useful/practical it is and how funky the control software is.
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Old 30th July 2013, 10:56 AM   #17
ghg is offline ghg  Austria
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Well, hopefully you will get the 1616m, NOT the 1616 -> lower quality AD/DA.

1616m:
ADC - AK5394 (AKM)
DAC - CS4398 (Cirrus Logic)

1616:
ADC - PCM1804 (TI)
DAC - CS4392 (Cirrus Logic)


And the spike at 63 kHz is bad, time to build a linear 48V/18W PS.


Gary
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Old 2nd August 2013, 04:31 PM   #18
RNMarsh is offline RNMarsh  United States
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Check my input at -- Active Twin-T filter forum regarding the use of a notch filter for similar purpose and other apps using an HP334A

THx-RNMarsh
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Old 2nd August 2013, 05:34 PM   #19
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Link? (No useful Google Hits.)
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Old 2nd August 2013, 06:31 PM   #20
richiem is offline richiem  United States
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Build -- Active Twin-T notch filter for distortion analysis
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