Horn Rotation - QSC MD-FP122/124r User Manual

Horn Rotation

The coverage angles for each model, as shipped from the factory, are show in the specifications
section. If desired the high-frequency driver/horn assembly can be rotated 90° in order to change
the coverage angle planes.
Example: An MD-FP122/64r as shipped from the factory has a nominal coverage of 60° in the
horizontal plane and 40° in the vertical plane when the enclosure is oriented normally (vertically,
as shown at the right). To change the coverage to 40° in the horizontal plane and 60° in the verti-
cal plane, the high-frequency driver/horn assembly would have to be removed, rotated 90°, and
reinstalled.
How to Rotate the Horn
Note! It is always best to have an assistant when working with large assemblies such as
this enclosure. The grill assembly is under tension when installed! Be sure to temporarily
secure the grill with tape or have an assistant hold the grill edge while removing its
retaining screws.
1- Remove the four screws from one side of the grill while having an assistant hold the
grill from springing free. Remove the four screws from the other side of the grill. Place
the grill and retaining screws aside.
2- Remove the eight horn retaining screws. Carefully lift the horn from its mounting re-
cess while being careful not to tear or pull away the foam gasket between the horn and
enclosure.
3- Rotate the horn to the desired position and set back into its mounting recess, being
sure the gasket is properly positioned.
4- Install the eight horn retaining screws. Do not fully tighten the screws until all have
been installed and finger-tightened. This will help to prevent the chance of cracking the
horn. Fully tighten the retaining screws.
5- Position and align the grill assembly for reinstallation. Install four retaining screws on
one side; do not fully tighten. carefully bend the grill around the front of the enclosure
and install the remaining four retaining screws. It is easier to have an assistant hold the
grill in place while installing the final four screws.
Grill retaining screws are to be torqued to 30-35 pound inch (0.35 -0.40 kilogram meter)
Horn assembly retaining screws are to be torqued to 40 pound inch (0.46 kilogram meter)