Acceptable miking

[Question]

Hello

Eventually I decided to start such a topic.

I gonna share a simple configuration I accidentally discovered as soon as I take some pics and scan the schematic, although all new/other ideas will be appreciated.

Edited January 13, 2006 by Question

[greenmachine]

So, when will you enlighten us?

[Question]

Hello

This is the result of my "most basic construction" experiments.

As I mentioned in the topic, I was looking for a solution to record our band's rehersals and the last time a SPL meter positioned in the middle of the room was showing values around 126 dB.

But as a personal preference I did not want to carry/use a mic heavier/bigger than half size/weight of my MD recorder.

To make the story short this mic connected to mic-in of my Sony caused no distortion, no audible hiss and no excess bass with enough tonal quality and stereo seperation (despite their omni pattern). This is maybe due to cardioid behaviour of omni electrets at high frequencies. I set recording volume to manual and around 4/10 or so.

Here are the pics:

[attachmentid=1303]

I soldered point A and B to ground and C to signal/plugin power and shrink wrapped them.

There was no significant difference btw left and right channels despite non pre-matched capsules.

[attachmentid=1304]

[attachmentid=1305]

and a very raw graph

[attachmentid=1306]

Far from a flat response but this is an other issue.

Ps: There was a "Eagle international, made in Japan" label on the package of the capsules. But I couldnt find any info about this on the Internet.

Edited January 18, 2006 by Question

[greenmachine]

Congratulations, what you have just discovered is the standard 2 wire configuration applied to 3 wire elements. You're just lucky that these particular capsules seem to be low sensitive enough not to overload the preamp. On the other side (i have no idea how accurately you have measured the frequency response) standard (2 wire) Panasonic miniature omni caps show an almost perfectly linear response from 20-20000Hz (with a negotiable 2dB peak at ~12kHz).

Looking forward for some audio samples.

[Question]

Thanks

For accuracy, I know that a dedicated lab environment is needed for a reliable frequency response graph, and at least a flat audio card (like my echo indigo which is known to be really flat in both sound and shape ) and a reference sepaker (which I don't have) for poor man's DIY tests.

But someone may easily compare two electrets with ordinary speakers (if one mic's graph is in the hand as a reference) and can get a relative idea about the unknown one. And that was what I did. I unfortunatelly don't have well known WM60-61s around thus I used a WM54 instead. I have WM54's specs sheet here, and graph looks almost ruller flat. Of course I couldnt see the same in my test settings due to my non-flat speaker? But since I just wanted to compare two, it was no problem.

Here is the result:

[attachmentid=1309]

No huge difference?

And a bit less mids which I prefer at the moment.

By the way I'm also a little bit sceptic about those ruller flat graphs. But I better keep this for an other thread

Best regards.

Edited January 18, 2006 by Question