Tuesday, November 20, 2007
Typical "20 to 20" response curves
You see a lot of curves shown so the response looks fairly flat. Here is one of them. I see that the numbers are a little hard to read. The bright vertical bar on the right corresponds to 10kHz. As you can see, both mics tend to drop off a bit after that point. There are other ups and downs at the lower end of the spectrum too. What we are looking at is the compared response curves of the Proscenium vs a Cardioid microphone. The red curve is the Proscenium, our most rolled off mic, and the blue is the cardioid. (more about that) (even more about that) The point of this post, however, is to show the "typical" Y axis steps, which are compressed. We have in our printed specifications chosen to "uncompress" them a little, in order to show the detail as we see it. That makes the mics look even less "flat". But it doesn't change their sound.
Amplitude and frequency plots tell too little about the way a mic or any transducer sounds. The process of receiving, converting and sending acoustic signals as electrical signals is surprisingly complex, even for the most simple forms of transducers, and
acoustic impedance matching,
electrical contact quality,
and many other factors predominate tone and affect the application of a particular device.
Here is a link to a gearslutz thread relating to this post.
Posted by Bob Crowley at 6:53 PM