If you use recordings of bird calls on your iPhone or iPad or other such devices you're probably not getting the volume you might want. I'm not, not even when plugging in my old clam-shell speaker, small and handy, but lacking carrying power. Take a look at some new speakers highly recommended by David Pogue, the New York Times tech guy. Go to http://pogue.blogs.nytimes.com,"Terrific Sound in a Tiny Package."