I got this mic a couple of days ago and I want to use it for measuring my DIY speakers. I noticed there is a lot of noise. Is this normal?
I recorded this sample about 03cm away from my mouth. The room is dead quiet. This noise is present on multiple devices (phone, PC)
Left: Noise floor IMM6.
Right: Noise floor phone built-in mic.
I recorded this sample about 03cm away from my mouth. The room is dead quiet. This noise is present on multiple devices (phone, PC)
Left: Noise floor IMM6.
Right: Noise floor phone built-in mic.
New discovery: The noise gets louder as time goes on. It starts at an acceptable level, but increases to an unusable level. I plug in the IMM6 around 4-5 seconds
You likely are looking at AGC, not the microphone itself. Consumer stuff adjusts microphone gain automatically, presuming there should be some noise. Are you using a smartphone? I suspect every phone does this these days, unless the app used switches it off. And I haven’t got a clue how good or bad the preamp in this smartphone is, but bare electric noise levels don’t say that much as you did not add a reference sound level.
Smart phones will filter out heaps of background noise, and the IMM6 is designed to pick up slight variances
The same thing happens on my desktop pc. I recorded the sample with Audacity. It starts out at ~ -40db and climbs to -24db. The mic shouldn't auto adjust on a desktop. It's fixed at 40% input level. I have turned all audio effects and microsoft clear voice off.
After my post I contacted the seller. They are super kind and offered to send me a replacement microphone without sending the old one back.