Owners Manual

Decca Tree
This classic microphone configuration was developed by Decca Records engineers in the
1950s. The Spacebar Decca Tree configuration provides a simple, precise, and easy to set up
solution for this technique. The standard Spacebar Decca Tree comes with three E420 1
meter tubes, an SB-SMA 5/8”-27stand mount adapter and three SB-AMH adjustable mic
holders. These are configured to provide a 2 meter spacing between left and right
microphones and a center microphone 1 meter forward. Since the stand mount adapter can
move front to back on the 1 meter tube it should be located at the balance point for maximum
stability.
fig. 2: Decca Tree
See the SB-DT system exploded parts diagram for a list of included components.
Blumlein
The Blumlein stereo micing technique was pioneered by Alan Blumlein in the 1930s. The
Spacebar Blumlein configuration allows for holding two figure-8 microphones on the same
vertical axis and at a precise 90 degree angle of incidence. Two types of mic holder are
available depending on the microphones being used. For RCA 44 and RCA 77 type mics and
their derivatives the SB-AMHRA holder should be used. Most other microphones can be
mounted with the SB-MH standard mic holder.
A unique feature of the Spacebar Blumlein configuration is that the whole vertical tube
assembly can be rotated on a horizontal axis allowing the mics to be aimed up or down
Spacebar Modular System User Manual Revision C Page 9 of 29
105cm
210cm