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## Re: Lightweight array suggestions

 Subject: Re: Lightweight array suggestions "mrmarcanderson" mrmarcanderson Wed Aug 31, 2011 6:36 pm ((PDT))
 ```Thanks David & umashankar for your tips. I look forward to experimenting wi= th some different arrays & comparing the results. --- In m("yahoogroups.com,","naturerecordists"); umashankar wrote: > > the article i was talking about has a link in the wiki on pzm > > > i have published my poems. you can read (or buy) at http://stores.lulu.co= m/umashankar > > From: umashankar > >To: "m("yahoogroups.com","naturerecordists");" > >Sent: Tuesday, August 30, 2011 6:34 PM > >Subject: Re: [Nature Recordists] Lightweight array suggestions > > > >boundary layer microphones have a slightly different set of rules.=A0thi= s includes the crown sass/=A0there was a very good article on the crown web= site many years ago, but briefly stated, the longest wavelength suppported = by a boundary plate is six times the longest dimension of the plate. and at= this transition frequency, the omni mic mounted on the boundary gets a mor= e and more omnidirection directivity pattern=A0 ( i think roughly 6 db/octa= ve) > >=A0 > >the net result is the noise gain of the microphone is independent of fre= quency, though the directivity pattern and front gain, rises till it reache= s cut off frequency and then stays flat. > >=A0 > >one array i had built myself consisted of two six inch square acrylic pl= ates hinged together. each plate contained five six mm omni capsules glued = flush to the surface in an irregular cross, the capsules were paralleled. t= his gave me a microphone with surprising directivity and gain, and the two = hinged plates gave me a stereo pair with adjustable angle between the micro= phones > >=A0 > >i got some nice results with both nature recordings and music with this = array about 20 years ago. > >=A0 > >umashankar > >=A0 > >=A0 > > > >i have published my poems. you can read (or buy) at http://stores.lulu.c= om/umashankar > > > >From: Avocet > >>To: m("yahoogroups.com","naturerecordists"); > >>Sent: Tuesday, August 30, 2011 6:20 PM > >>Subject: Re: [Nature Recordists] Lightweight array suggestions > >> > >>> I would like to make an array that is as light & transportable as > >>> possible, yet won't be easily damaged. > >> > >>Marc, > >> > >>There is a golden rule with most arrays if you are interested in > >>medium to low frequencies as heard in forests, and that is the size of= > >>any baffle or boundary should be comparable to the wavelength. At > >>500Hz the wavelength is 680mm. (27") > >> > >>An exception to this rule is with an M-S mic or a double cardioid pair > >>which will give you a good stereo image with a wide frequency response > >>and - importantly - is easy to carry and deploy and shield from wind, > >>rain and insects with standard windgags. > >> > >>David > >> > >>David Brinicombe > >>North Devon, UK > >>Cogito cogito ergo cogito sum - Ambrose Bierce > >> ```
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