Hi. First post. Thanks for providing such a nice utility for free. As I stated in the subject, I am using FreqAnalyst to look at pink noise recorded in Audacity from my cartridge. There could be a number of issues, starting with the test records used to generate the pink noise. In addition, there may be some weighting than needs to be applied, although I am recording the signal as it comes from my phono preamp.
In general, at a 50K loading on MM cart, I am seeing a 28db drop as the signal moves into the higher frequencies. I know this cart, as measured in other software, typically shows a lift in the higher frequency, which does appear in the data. Anyway, I guess I am asking what I am missing in terms of making the data as accurate as possible.
Can’t attach a screen grab as I do not have enough posts.
Thanks in advance for any response.
Measuring Phono Cart with FreqAnalyst
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- KVRAF
- 6323 posts since 30 Dec, 2004 from London uk
You are using an RIAA Phono preamp which changes the response :
http://en.wikipedia.org/wiki/RIAA_equalization
http://en.wikipedia.org/wiki/RIAA_equalization
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- KVRer
- Topic Starter
- 2 posts since 21 Apr, 2014
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Right, but I am also getting some anomalies associated with peculiarities of the test records I have. However, I have realized I can generate pink noise from within Audacity so I have some benchmark to work from.UltraJv wrote:You are using an RIAA Phono preamp which changes the response :
http://en.wikipedia.org/wiki/RIAA_equalization (http://en.wikipedia.org/wiki/RIAA_equalization)
Other softwares seem to render a much smoother slope, even than what Audacity is producing. Maybe I need less smoothing, or I need to instant and adjust the precision.
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- KVRAF
- 6323 posts since 30 Dec, 2004 from London uk
There are a few other variables. The age of the stylus, the adjustment of cartridge angle. The quality of preamp. The age of the cartridge. The wear on the vinyl. When you say "as measured on other software" did you try the exact vinyl reference recording and software others have used? Maybe youre just finding that your Stylus/Cartridge/vinyl isn't optimal.
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Blue Cat Audio Blue Cat Audio https://www.kvraudio.com/forum/memberlist.php?mode=viewprofile&u=39981 - KVRAF
- 5821 posts since 8 Sep, 2004 from Paris (France)
I guess it depends on the weighting used for your other measurements. Our plug-ins do not apply any filtering (you get the " straight" measurements).
Typically, since pink noise has a 3dB/decade slope, you would have to compensate to actually measure the response of your equipment. Or you can use white noise instead (flat response). The free version of the analyzer does not provide slope correction, but you can try the demo of the FreqAnalyst Pro plug-in to check your measurements.
Typically, since pink noise has a 3dB/decade slope, you would have to compensate to actually measure the response of your equipment. Or you can use white noise instead (flat response). The free version of the analyzer does not provide slope correction, but you can try the demo of the FreqAnalyst Pro plug-in to check your measurements.
