MicW Audio
A Division of BSWA Technology Ltd
Unit 1003 North Ring Center,18 Yumin Road,Beijing 10029
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!
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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.
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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?
