Is it a good idea to wire an ELECTRET mic in parallel? What are the advantages and disadvantages? Answered
I already made a prototype of a low-noise desktop microphone (with an internal 5 stage transistor preamp). It only had one ECM capsule inside. A few days later I found a couple of pictures of a certain microphone with two ECM capsules wired up in parallel. It made me wonder, will it increase the sensitivity of the mic while reducing noise or will do the exact opposite? Is is a bad idea to hook six of these in parallel? Sorry, I'm not an expert when it comes to microphones. Before I post a guide, I wanted to make sure of what I'm saying.
If you are familiar with the Blue Snowball USB microphone, you'll be surprised on what's in it. I recently discovered that it has two "Electret Condenser Mic Capsules" soldered in parallel. I thought there was something special about the Snowball since the reviews went crazy (4 1/2 stars on amazon)! I was expecting a huge diaphragm, but no, it only had two tiny ECM mics soldered on a Preamp + USB DAC. Lesson learned! Never underestimate an ECM mic.
The picture is my prototype, it's working great right now. Luckily, the 5 stage preamp is giving zero noise. I'm planning to add a USB D.A.C. and an ECM array on my final version.