QSC SC-423C Mode D'emploi page 5

Mounting
Attaching to Low Frequency Enclosure
The mid-high loudspeaker assembly attaches to the top of the QSC low frequency cabinet with three M8 bolts, 20mm long, with lock
washers. This hardware ships installed on the low frequency cabinet. We recommend the use of serviceable thread locking compound
when installing the bolts to prevent loosening due to vibration. Do not fully tighten the mounting hardware before aiming (see below).
Aiming
Aim the horn in the horizontal plane (pan) before tightening the attachment hardware. Adjust the vertical tilt with the mid-high vertical
adjustment bracket. The mid-high assembly is equipped with an aiming sight to assist in achieving desired coverage quickly and easily.
For typical applications, the aim point should be the center seat in the back row of the auditorium. If the cinema screen has already
been installed, a flashlight placed at the desired aiming point can be seen through the screen perforations in a darkened auditorium.
Where the sight holes are located:
EN
Settings
BI-AMP / TRI-AMP Operating Mode Selection
Set the operating mode selector switch to BI-AMP or TRI-AMP, depending on your application setup.
2
How to use the sights:
BI-AMP-When set to BI-AMP, the MH-1075C accepts mid-high frequency
signals on one set of inputs and uses an internal crossover network
between the mid- and high-frequency drivers. The signal applied to the
mid-high loudspeaker assembly must not contain low-frequency content
(below 200 Hz).
TRI-AMP- When set to TRI-AMP, the MH-1075C accepts separate mid-
and high-frequency signals on two sets of inputs. The internal crossover
network is bypassed and only the protective circuitry for the H.F. driver
remains. Each of the driver's signals must have the appropriate signal pro-
cessing before operating.
Do not connect amplifiers directly to the driver inputs! Always
use the input terminal strip.
Aim point: