Thank you. I always find your posts interesting. I started to measure one of my earphones and i noticed that there is a weird spikes in the frequency spectrum when nothing was attached to the mic input. So I assume that these spikes could be the result of circuit board. Therefore I wanted to...

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Hi, I looked at the calibration files of multiple microphones and couldn't figure out how it works when loaded into REW or similar software? Lets say if I have a value of -0.9 for 29Hz and + 1.5 for 2Khz. How the software translate and compensate these values? Do the calibration file tell the...

After multiple tests using different type/size of couplers, I come to the conclusion that the imm6 is incapable of recording treble frequencies accurately beyond 6Khz. I even connected the eartip directly to the mic without any coupler and it produced the same output (although with less bass)...

I'm using imm6 and AudioTools app on my LG V30. I put the imm6 in a relatively sealed box to minimize environmental noise and run averaging test for at least 3mins using both my LG V30 (below picture) and Asus Zenfone (top picture). No coupler was attached. I noticed that the spl level starts...

Thanks GREQ, It's understandable but one of the earphones that i tested should exhibit a very flat FR whereas it follows this weird sort of FR algorithm as the other two earphones. To make things further more complicated l. I ran a free air test of the mic in a reasonably silent environment...

See the attached image.

Hi, I started to test the FR of my earphones and after running few tests I noticed that the recorded FRs for all earphones follow similar pattern. There is a drop around 8K and I wonder if it's due to the type of coupler I'm using or something else? Can someone shed some light into this? Cheers.

My results were really bad (using 2 inch tube): Here's the link to original source file: https://drive.google.com/file/d/1LkPlIdhw9C5DzM0BTfsiVgUv_Q27I9-K/view?usp=drivesdk And below the recorded sound: https://drive.google.com/file/d/1LnI6UhF_ld6x9-SbG3WC_HxYHLjxJe3X/view?usp=drivesdk

Thanks for the links. I'll go through each to find out more about measuring rigs/techniques. My first aim is to achieve a more natural and accurate results by using different tube/coupler while keeping the costs low.

Hi, I've purchased a Dayton imm-6 and followed the instructions in the following video () to build a DIY rig to measure the earphone's frequency response (but I haven't used the pink noise method) and noticed that the recorded sound is very muffled with excessive bass and very inaccurate...

Update: The issue fixed by putting my phone into airplane mode. Looks like the cellular signal was interfering with the mic.

Update: I've connected the mic to a powerful laptop and it worked ok with some hiss noise background. Also tested it with my friend's Pixel 3a and worked fine. No clipping at all. Seems to be the problem with my Asus Zenphone 4. Need to buy a phone with better DAC/ADC.

Anyone?