MicW Audio i436 Faq

MicW Audio A Division of BSWA Technology Ltd

Unit 1003 North Ring Center,18 Yumin Road,Beijing 10029 [e-mail]
China www.mic-w.com

MicWi436FrequentAskedQuestions

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Question 1

I am looking into using the i436 product as part of a sound analyser solution as I understand it
achieves Class 2 status. If successful, this could result in a large number of your products being
purchased.

I understand that there is a 200Hz hi-pass filter at the input stage of the iPhone and iPad devices
which would limit the frequency range of such a system. Has this been corrected somehow within
the microphone circuitry? Otherwise it would seem that its designation as a Class 2 microphone for
such applications is misleading!

¾ Answer 1

The I436 is designed and manufactured according to our measurement technologies. The i436
meets the IEC 61672 Class 2 requirements when it inputs high end sound cards. But if it is
connected to iPhone or iPad, the accuracy is depended on the software. The i436 does not have the
correction for low frequency. The correction should be done on the software part.

In conclusion, i436 meets the Class 2 standard. But i436 with iPhone sound card and RTA software
will need some correction at low frequency to meet the Class 2. The customers need to know the
limitations.

¾ Question2 What is the minimum sound pressure level IPhone or iPad can measure?

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Answer 2 34 dB (A)

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Question 3 What is the maximum sound pressure level IPhone or iPad can measure?

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Answer 3 102 dB.

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Question 4 Does it work on Apple Laptops too

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Answer 4 Yes, It works

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Question 5 Where does that little peak in the frequency response (15kHz) come from?

MicW Audio A Division of BSWA Technology Ltd

Unit 1003 North Ring Center,18 Yumin Road,Beijing 10029 [e-mail]
China www.mic-w.com

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Answer 5 It related to the diaphragm resonance frequency o f the microphone capsule.

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Question 6 Does it work on other phones (Android)

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Answer 6 We did not test i436 with other phones

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Question 7

Is there a chance to integrate some kind of pad-switch or make some special low sensitive model.
the Car-HiFi and Live-Engineer guys are asking for 150dB!!

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Answer 7:

It is possible to design a special cable with -20dB or -40 dB pad to low the sensitive. However the
current design of i436 can only achieve 130 dB even with special pad cable. For 150dB, the
engineers may have to use N401 microphone which can handle 160dB.

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Question 8 What is the bit depth and the sampling rate of the iPhone

Answer 8: The iPhone 3 and 4 use 24 bits and 48kHz sampling.

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Question 9:

Is there a chance to integrate an inverted frequency response to the Iphone Low-Cut in an app?

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Answer 9 Yes. It can be done in the software. For the recording application, the software

allows the users to control the gains at each octave bands. For the measurement application, the
users have to look into the software specifications. The i436 only gives the flat frequency response.

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Question 10

What kind of spilt cable is supplied in the kit of the i436, I hope it is with Cinch/RCA-Connectors for
Line Out.

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Answer 10

The i436 Kit includes i436 microphone; split
cable, extension cable (3meters), clip,
windscreen. The split cable has two 3.5 mm
jacks, one for microphone and the other for earphone.