MicHead wrote: First thanks to all who responded to my first inquiry on the theory of the Decca Tree (previous posting). The information has carried me into the practical configurations of the the tree in use. Now, I would like to know if anyone can show me or direct me to the calculations underlying the determination of the spacings used for the tree's setup. I am assuming that it must have something to do with the width and depth of the ensemble to be recorded? Thank you in advance.

MicHead

You might want to read this first http://www.wesdooley.com/pdf/Surround_Sound_Decca_Tree-urtext.pdf

Then this http://mixonline.com/products/review/audio_Neumann_decca_tree/

We use a Decca Tree (named for the Decca enginers who came up with the idea) it is two omni microphones 2 meters apart (about 78 inches) and one omni sticking forward 1 meter (about 39 inches) it is mainly used for recording large ensembles and chorales but we use it for most things we record including a new piano recording we recently did. There is a lot of info on the WWW and if you type in Decca Tree you will see a lot of information. AEA in California makes really nice Decca Trees but they are well made and expensive. Ours was made by your's truly and a good machinist friend I know. It was made out of thick wall aluminum tubing and held together in the middle with a double "C" clamp that was used for holding remote microwave dishes to poles so it is of good quality and very durable. The ends are machined and attached to the cross bar but we also can mount other microphones by means of clamp on microphone holders we can move on the bar. Hope this helps....