Measurement microphone

Affordable Measuring Microphones Shootout – Part-3

This page is the follow up of Part-2, here you will find the outcome of my measurements, pros and cons about the 1/4″ Class 2 electret capsule measuring microphone shootout.

Neutrik 3382 vs iSEMic 725TR
Neutrik 3382 vs iSEMic 725TR

Results and findings; after measuring the three microphones the first what struck me was the recorded SPL deviation between the MicW i436 and the other two microphones (the reference – Neutrik 3382, and the other measured microphone – iSEMic 725TR).
All SPL levels below 85 dB the MicW i436 measured 0.5d dB to 0,6 dB of  scale (comparing to the two other microphones).
At levels above the 85dB the differences gradually did lessen to zero around 94 dB (where it was calibrated).

Another, bigger, problem arose for the MicW i436 (the only microphone without a frequency correction file) at the shootout. The spectrum measurements of the MicW i436 began te differ from the other microphones slightly at 4 kHz and a lot steeper at 9 kHz.

As expected the iSEMic 725TR (twice as expensive as the MicW i436) did a far better job, it followed the Neutrik 3382 nicely in both the frequency and SPL levels. The iSEMic microphone is of that quality that even the microphone can be used without the supplied frequency (free field and diffuse-90deg) correction files.

Surprisingly the last tested and cheapest Dayton iMM-6 did very well (after loading the frequency correction file) at the second shootout. It did follow the Neutrik 3382 and iSEMic 725TR nicely in both the frequency and SPL levels.

(you’ll find the screenshots of the measurements at Part-2)

Still a few remarks on the Dayton iMM-6 microphone.

Smaart v7 Di, Smaart Tools
ISO-Tech SLC 1356 sound level calibrator
  1. all used microphones were calibrated with my sound level calibrator (ISO-TECH SLC 1356), surprisingly the 1/4″ iMM-6 microphone housing doesn’t fit a 1/4″ sound level calibrator adapter.
    I’ve resolved this problem by using the 1/2″ sound level adapter and adding some masking tape around the head of the iMM-6 microphone to make an airtight seal between the housing and the 1/2″ hole.
  2. the iMM-6  has an short Y-shape body from which one of the “legs” has a headphones output which will very likely be “seen” by the omnidirectional capsule and could mess up your measurements. In my humble opinion I would advise the manufacturer to change the Y-shape body to I-shape (losing the headphones output) and lengthen the body a few inches like the iSEMic 725TR.

Caution: all three measuring microphones have a 4-pole mini-jack connector which can be mounted directly on your mobile device (smart phone and tablet). Mounting the microphones directly on top of your mobile device can be a risky one because of the rigid connection bumping against the microphone could damage the connectors of your microphone and/or mobile device.

 

iSEMic 725TR

iSEMcom measurement microphone
iSEMic 725TR

Pros:

  • very well 1/4″ sleek designed and machined aluminum housing
  • very accurate frequency and SPL measurements (can even be used without the frequency correction files)
  • frequency calibration files (free field and diffuse-90deg) can be requested through my.isemic.com 
  • special phantom adapter available and other accessoires

Cons:

  • not cheap, € 189,-

 

MicW i436

MicW i436 capsule
MicW i436

Pros:

  • nice 1/4″ machined aluminum design
  • card with serial number and sensivity value for easy SPL calibration
  • special phantom adapter available and other accessoires

Cons:

  • no frequency calibration files available
  • accurate frequency measurements only possible towards 4 kHz (upward of 9 kHz impossible)
  • unaccurate SPL measurements
  • not worth the money, € 91,-

 

Dayton iMM-6

Dayton, iMM-6, measuring microphone
Dayton iMM-6

Pros:

  • sleek quasi 1/4″ plastic housing
  • surprisingly accurate frequency and SPL measurements
  • frequency calibration file on serial number available for download at the product page
  • cheap, € 24,-

Cons:

  • the microphone housing doesn’t fit a 1/4″ sound calibrator adapter
  • the Y-shape headphone output is “seen” by the omnidirectional capsule and could mess up your measurements
  • no phantom adapter and accessoires available
  • no real User Guide or Manual available

Special thanks to Fred van Eijk from MicW European Office and Martijn Ouwerkerk from SoundImports for lending me the measuring microphones and accessoires for the shootout.

Thanks for visiting. Feel free to leave a comment and say hi.

Leave a Reply

Your email address will not be published. Required fields are marked *