Re: Loudspeakers for dogs (Bradley Wood Libbey )

Subject: Re: Loudspeakers for dogs
From:    Bradley Wood Libbey  <gt1556a(at)PRISM.GATECH.EDU>
Date:    Mon, 21 Aug 2000 13:56:04 -0400

Pawel, With regards to your question about small speakers to use... Consider the physics of the source that you want, a speaker mounted on a large flat plain will create a sound field like a piston source. A single open speaker suspended in space will be a dipole, and don't forget about reflections. I used two small inexpensive RadioShack speakers for an experiment that I am running. I mounted two of them face to face and wired them in parallel and suspended them in a room. This is cheap way to approximate a monopole source for low frequencies. I can't give any specific recommendations for good speakers because I was on a budget and had to use what was available, instead I calibrated them. If you can preprocess the sounds digitally, calibration and then prefiltering your signals might help. Since I had available to me an anechoic chamber I was able to measure the speaker system response. This response was then used to create an inverse filter that is convolved with any digital sound I send to the speaker system. Hopefully eliminating the linear response of the speaker system. It wasn't perfect, but both the time and frequency responses were improved. This is time consuming but it is an option. Hope this information is of some use. Brad Libbey

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