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TOPIC: couple question

couple question 2 years 7 months ago #30970

  • victor910
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1. umik specification said, sample rate at mic equal 48000Hz for input, but my dac generate output to speakers only 44000Hz sample rate, my question, if output equal 44k sample rate, but input equal 48k sample rate this will working properly? this is possible setting different input/output sample rate in measure software? please give me more details for my situation.
2. to many people ordered at this website cross-spectrum.com/measurement/calibrated_umik.html , but price is more expansive compare to minidsp.com , question, any benefit from first website? i don't know this will be needed for me in future, because i never making any acoustic measure, help me making right decision.
thanks for help.
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couple question 2 years 7 months ago #30984

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do you help me?
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couple question 2 years 7 months ago #30987

  • john.reekie
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Hi Victor, as far as I know, REW requires that input and output sample rates be the same. If you are sending your signal through a USB DAC that will accept ONLY 44.1 kHz, then it may not work. HOwever:

1. Are you sure it works with only 44.1 kHz and not 48 kHz? It would be surprising.
2. You don't necessarily have to send the measurement signals via the DAC, you can also use other signal paths such as e.g. analog line/headphones outputs from the computer.

Cross-spectrum provides measured calibration files at 45 and 90 degrees (as well as 0 degrees). (The 90-degree file that miniDSP provides is calculated from the on-axis response only, not separately measured). If you don't need these files, then the standard UMIK will be fine. If you do or might need them, then the Cross-Spectrum version is not much more.
I am not miniDSP support.

"You must ask the right questions." - Dr. Alfred Lanning's hologram.
-> Have you read the User Manual??
-> Have you drawn and posted a diagram?
-> Have you posted a screenshot?
-> Have you posted your config file?
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couple question 2 years 7 months ago #30996

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Thanks you very match .
My project means only 44k, do you have any recommendation mic with 44k?
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couple question 2 years 7 months ago #30997

  • john.reekie
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Hi again, I'm not sure what you mean by "My project means only 44k", but I'm wondering if you are mixing up your acoustic measurement process with your playback system? (i.e. just because you have only 44.1k file to play back, does not means you cannot do your meaurements at 48k).

To answer your question however, you could look into external USB soundcards such as the MOTU Microbook II (I use one) or Focusrite Scarlett, with a microphone such as www.cross-spectrum.com/measurement/calibrated_dayton.html
I am not miniDSP support.

"You must ask the right questions." - Dr. Alfred Lanning's hologram.
-> Have you read the User Manual??
-> Have you drawn and posted a diagram?
-> Have you posted a screenshot?
-> Have you posted your config file?
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couple question 2 years 7 months ago #30998

  • victor910
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My "sound card" output only 44, 88, 176
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couple question 2 years 7 months ago #31120

  • devteam
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@ victor910

As John is already explaining in great details (and we may have done the same via tech support as this sounds like a very familiar question.. :-), the sample rate of your DAC has little to do with the measurement. These are unrelated. You don't need matching rate to your DAC sound card. You're measuring your speakers, not your DAC.. :-)

HTH

DevTeam
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