Date: Wed Jan 6, 2010 2:03 pm ((PST))
When researching this sort of thing for playing impulse response sweaps
I came up with car stereo units ( soe have sd aswell as cd and ipod etc
) They take 12v battery power and have decent amplifiers. This plus
any half effecient loudspeaker would work just fine.
> This is somewhat tangential in that it relates to the broadcast of
> natural sounds, rather than the recording, but not, I hope, completely
> The issue I have relates to the use of natural distress calls of birds
> as a measure to deter birds from airports, thus reducing bird strike
> hazard. It appears that all commercially-available devices providing
> distress calls for bird deterrence do not contain species suitable for
> airports I deal with here in Asia, nor do they allow self-made
> recordings to be added to the library of sounds available for playback.
> In addition, typical recorders do not have sufficiently powerful
> built-in speakers. Consequently, I am looking for a portable,
> amplifier/loudspeaker device that I can attach to a recorder/playback
> device, which can be used to broadcast distress calls from birds as a
> measure to reduce bird strike hazard at airports.
> Can anybody recommend a portable device suitable for broadcasting sounds=
> loud enough to carry 200-300m or so, and one that can be plugged into a
> digital recorder? Or even one that has its own memory card?
> Many thanks,
> Geoff Carey