Owners Manual

To calibrate the angle of incidence, follow these steps:
A) Loosen locking thumb screw and rotate mic holder so that 0 degrees is indicated.
Then re-tighten the thumb screw.
B) Thread on the microphone clip and orient it so that it is perpendicular to the
Spacebar tube.
C) Lock the microphone clip in place by tightening the jam nut against it.
D) Now the angle of the microphone can be precisely adjusted by loosening the thumb
screw and rotating the microphone.
The location of the microphone holder can be precisely set by using the numeric scales
engraved on the tubes. The SB-MH and SB-AMH feature a sight hole that allows microphone
holder to be positioned on the centimeter indicator circles. The SB-TJ90 tube joiner also has
sight holes allowing for proper centering of cross bars and measurement between cross bars
and microphone holders. The scales on the various bars are indicated as follows:
• E420 indicated in centimeters and reads 0 to 105cm from left to right and 105 to
0cm right to left.
• E421 indicated in centimeters and reads 40-0-40cm.
• E407 indicated in centimeters and reads 25-0-25cm from the center.
E418 Tube Joiner
The E418 tube joiner is used to connect any two of the 7/8” diameter tubes. Typically used for
the 2 meter segment of the Decca Tree or for very wide stereo bars. To join two tubes simply
slide the tube joiner bar into one of the tubes and secure with the 8-32 x 1/4” flat head screw.
Next, slide the second tube over the joiner bar and secure with the other screw. See diagram
below.
fig. 9: E418 tube joiner bar assembly
Spacebar Modular System User Manual Revision C Page 14 of 29
E418 TUBE JOINER
H402 8-32 x 1/4”
FLAT HEAD SCREWS