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 Post subject: Mike, what do you think about this mic for audio test @home?
PostPosted: Mon May 23, 2016 8:53 am 
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Joined: Wed Jun 13, 2007 10:12 am
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Location: ITALY
As in subject: http://en.rode.com/microphones/nt1-a

Thanks in advance for sharing your thoughts/experience.

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 Post subject: Re: Mike, what do you think about this mic for audio test @h
PostPosted: Sat May 28, 2016 7:08 am 
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Not a great choice, mainly because any mic used for testing must be calibrated. This means matching its sensitivity to a known reference signal source, namely a mic calibrator. Such calibrators are almost all designed to fit over the head of a 1" diameter mic head. The one used here in SPCR lab is very good & cheap -- http://www.silentpcreview.com/article875-page3.html

The calibrator emits a reference 94dB 1kHz tone. The output of the mic is fed into the software, which is then adjusted & set to show 94 dB SPL. Now the measurement system is calibrated for accurate SPL. We routinely check this; it can vary a bit depending on temperature & humidity and its effects on the mic as well as the electronics. (usually less than a dB in our case, since the mic is always powered on & in the chamber, whose door is usually closed).

The mic you linked cannot be calibrated in such a manner, so it's not really useful for testing.

Rode makes another mic that's decent for testing purpose -- NT5. This is a 1/2" capsule cardioid pattern mic. The head is not a perfect fit for either 1" or 1/2" calibrator openings, but you can devise a simple adapter to fit it to the 1" opening. The cardioid pattern is not ideal for testing, but an omni capsule is available for it, NT45-O. Self-noise is 16 dBA -- not great but good enough for accuracy down to ~20 dB, which is much better than even >$1,000 SLMs.

Ask Abula about it -- he got this mic & calibrator a couple months ago. We had a long series of email exchanges that led to this. ;)

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 Post subject: Re: Mike, what do you think about this mic for audio test @h
PostPosted: Sat May 28, 2016 10:16 am 
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+1 for Italian and Guatemalan SPCR test labs :)

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 Post subject: Re: Mike, what do you think about this mic for audio test @h
PostPosted: Sat May 28, 2016 2:09 pm 
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MikeC wrote:
Ask Abula about it -- he got this mic & calibrator a couple months ago. We had a long series of email exchanges that led to this. ;)
Sadly i had been travelling too much lately, spending 3 sometimes 4 weeks out of home, haven't been able to test it fully. I might have more time this two weeks, but i gotta go back again on the road soon ='(. Everything is here, just need more time.

Once i finish the setup ill post my experiences, and if it works the way i think (and mike really helped a lot) ill try on the future to include noise measurements per fan.

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 Post subject: Re: Mike, what do you think about this mic for audio test @h
PostPosted: Sat May 28, 2016 11:38 pm 
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Abula wrote:
haven't been able to test it fully

Where did you find the Landtek calibrator?

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Luca

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 Post subject: Re: Mike, what do you think about this mic for audio test @h
PostPosted: Sun May 29, 2016 4:48 am 
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Same place I found it years ago, iirc. Ebay -- http://m.ebay.ca/itm/Sound-Level-Noise- ... nav=SEARCH

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 Post subject: Re: Mike, what do you think about this mic for audio test @h
PostPosted: Fri Jul 08, 2016 6:27 am 
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Abula wrote:
Once i finish the setup ill post my experiences

What about the acquisition hardware (ADC-DAC, audio interface) /software (audio anayzer or whatsoever) you sorted out?

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Luca

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