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Old 25th October 2013, 09:14 PM   #11
Eldam is offline Eldam  France
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Location: At home, sweet sound home...
After enter Generic calibration file for my micro, it is better above 1K :

first picture : silent room
second picture : pink noise, mic at half one meter between tweeter and medium
FS: 192 khz ; FFT : 65536 ; Wnd : Hanning....

a little dig at 2khz and a little bump at 8 khz... can I believe that ? Or do i have to change the ASCII calibration file to make the curve without sound flater ?
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Last edited by Eldam; 25th October 2013 at 09:35 PM.
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Old 25th October 2013, 10:35 PM   #12
jayadev is offline jayadev  India
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As of now for learning I am using Creative Sound Blaster X-Fi Surround 5.1 Pro.

When I get the hang of it ,I may consider going for upmarket stuff.
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Old 26th October 2013, 04:04 AM   #13
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Quote:
Originally Posted by Eldam View Post
Pirat of Carabians: RTA & ARTA are goods softwares...don't think it's the softs but the lake of method from us !

Without injecting signal with soundcard or rec with its digital source : what is a normal curve with such equipment in a room if not flat?

Is it noise of the pre sound card or/and non calibrating correction curve of the mic applied in the soft ?
I just started getting into these test softwares recently so have NIL knowledge about them right now. But found that most of online test websites mostly use RightMark. And AFAIK you can feed the line-in and mic in RMAA too. I also downloaded free version of RMAA and was just playing with it.

Last edited by Jack Sparrow; 26th October 2013 at 04:21 AM.
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Old 26th October 2013, 02:28 PM   #14
jayadev is offline jayadev  India
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What I actually want to know is


1.Do I need to use the calibration file to make it flat.

2.Is there some inherent problem with my computer or sound card for being too much noisy in HF octaves? Indicating for an immediate upgrade to better sound card or Pc.


If former is the answer then I have no more doubts on this matter.

Experts Please advice.
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Old 26th October 2013, 05:45 PM   #15
Eldam is offline Eldam  France
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Quote:
Originally Posted by Jack Sparrow View Post
I just started getting into these test softwares recently so have NIL knowledge about them right now. But found that most of online test websites mostly use RightMark. And AFAIK you can feed the line-in and mic in RMAA too. I also downloaded free version of RMAA and was just playing with it.
thank you JS for input, I have to try it too if free.

I have great pain to have a flat curve with my mic and it's worse below 2K with our without generic calibrated file.

As I think my USB pre tracker pro is enough for Spectrum analys, I fear that I need a calib mic.

A question in complement to OP : in a home room, can we expect to have a +/- 2 DB curve above 100 hz ?

Maybe a link or a forum for the art in home acoustic measurement will be pleasse very helpfull if exist.

thanks

Eldam
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Old 26th October 2013, 06:11 PM   #16
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Impulse response measurement with swept sine is much better way to measure, be it gear, speakers, or room interaction.



Generic measurement microphones are typically very flat from 50Hz-4kHz, some up to about 7kHz. High quality measurement microphones are often flat from below 10Hz to >20kHz.

Sound Blaster X-Fi is likely very flat to below 15Hz; noise floor below 16bits, and distortion <0.008%.

Many multiple channel sound cards may be used as active crossover and equalization platform when used with convolution engine implemented on computer.
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Old 26th October 2013, 09:10 PM   #17
Eldam is offline Eldam  France
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How do you impuse Swept sine ?

Yajadev : How to measure frequency response of completed loudspeaker at home with accuracy

experts point of view...

And finaly a question that maybe has be posted many times : is it possible to measure its room in a relative silent mode to calibrate its own sound cards + mic for a flat response (assuming +/- 2 DB is a good flat curve for ears). I have a doubt about the OP want to measure its soundcard or own mic. They are just a part of the problem... no ?

Last edited by Eldam; 26th October 2013 at 09:18 PM.
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Old 26th October 2013, 10:27 PM   #18
jayadev is offline jayadev  India
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Hi Eldam,

Thanks for the link.

I have used ARTA as well. in Arta the measurement is in dBv and loks flat.

But coming back to my first post,Why is it slanted? why thier is high amplitude of HF noise showing in TRTA and REW.
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Old 26th October 2013, 11:34 PM   #19
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In OP result:

Click the image to open in full size.

Looks like source signal was white noise instead of pink using RTA 1/48 octave. For this mode use pink noise. For spectrum mode use white noise.
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Old 27th October 2013, 12:02 AM   #20
jayadev is offline jayadev  India
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Nope, Input is at 0 with no signal.



Quote:
Originally Posted by Barleywater View Post
In OP result:

Click the image to open in full size.

Looks like source signal was white noise instead of pink using RTA 1/48 octave. For this mode use pink noise. For spectrum mode use white noise.
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