That looks like multiple length TL's connected to the back of the main rear chamber. Reminds me of the Panpipe (never yet built).
http://www.diyaudio.com/forums/full-range/236779-panpipe-pentahorn-blh-speaker.html
http://www.diyaudio.com/forums/full-range/236779-panpipe-pentahorn-blh-speaker.html
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