Rockbox mail archive
Subject: Re: Microphone.
From: Garrett (GaryD_at_AdFreeInternet.com)
Sound Professionals has a collection of small mic preamps, some designed
with the JBR in mind:
Also check out the mics, incl. mic/pre combos and stealth mics.
---Here is a short microphone tutorial for JBR users---
If you want to capture the full frequency range you will need a condensor
mic, not a dynamic. (A dynamic mic is essentially an electromagnet, with the
coil mounted on the diaphram. This weighs down the diaphram and kills the
A condensor mic is essentially a capacitor. The diaphram has to be charged
all the time, so the mic needs a constant direct current, i.e.
"plug-in-power" or "phantom power". Since the JBR has only line in (meaning
5V, way more than a mic produces), you also need a mic preamp (or else a mic
with a built-in preamp). Some preamps (including the SP-PREAMP-2 and
SP-PREAMP-3 at Sound Professionals) will supply the needed plug-in-power to
the mic. (If the preamp does not supply plug-in-power, you must get a
separate battery power supply, or a mic with one built in.)
At the same price level, omnidirectional mics generally provide a wider
frequency range than cardiod (unidirectional). However, cardiods target the
sound better and reject ambient noise and room echo.
A "stereo mic" of course is two mics mounted together; a good choice for mp3
For further reading: Stereo Microphone Techniques by Bruce Bartlett.
Or the web page: "Stereo Mic Techniques for Field Use":
Page was last modified "Jan 10 2012" The Rockbox Crew