These tree speakers were handmade from +14" thick sections of what was once a towering elm tree, that have now been transformed into a completely unique piece of hi-fi art. The speaker enclosure is made from one solid piece of elm, sectioned only at the rear of the speaker in order to hollow out enough material to create the speakers internal volume of air.
Aside from being aesthetically pleasing and unique, using actual tree rounds as speaker enclosures is beneficial to the overall speaker design because it results in an almost seam-free cabinet, thick and acoustically dead enclosure material, and non-parallel internal sides which help to reduce unwanted frequency amplification and reverberation.
This Instructable describes the unique process of how I built these specific tree speakers, and is not meant to be a complete and comprehensive guide to speaker building. For that, please see my Instructable on How to Build Custom Speakers
, which the DIY speaker builder working on his or her own project will find much more helpful.
I think that the appropriate question to ask here is not "why build speakers out of a tree", but rather, "why not"?