I noticed today that Wildlife Acoustics is coming out with a new version of their Song Meter autonomous recorder. Among many changes is the addition of a 1000Hz high-pass filter. This might make it easier to use a mic element with a flatter response curve than the Knowles element, thus giving more sensitivity in the warbler and sparrow range.
Along those lines, has anyone tried wiring two or three Knowles elements in parallel for nocturnal monitoring? This multi-element approach has been used by some mic builders to get more sensitivity with little or no increase in internal noise. It won't help with environmental noise like the cricket chorus, of course, and might only be useful for a mic placed in a low-noise environment.
David Martin -- NFC-L List Info: http://www.NortheastBirding.com/NFC_WELCOME http://www.NortheastBirding.com/NFC_RULES http://www.mail-archive.com/nfc-l@cornell.edu/maillist.html --
