QSC MHV-1090 Manuel d'utilisateur télécharger pdf (Page 2)

Settings and Connections

TRI-AMP / QUAD-AMP Operating Mode Selection

Set the operating mode selector switch to TRI-AMP or QUAD-AMP, depending on your screen chan-

nel signal processing and amplification set-up. The mid frequency driver will require connection to its

rear cover terminals, regardless of mode selection. The low frequency driver will also require its own,

separate connections. The only connection difference between tri-amp and quad-amp modes is in

quad-amp mode, the very high frequency signal will require connection to the terminals labeled VHF.

TRI-AMP-When set to TRI-AMP, the MHV-1090 input panel connections accept high frequency/very

high frequency signals on one set of inputs and uses an internal crossover network between the high

and very high frequency drivers.

QUAD-AMP- When set to QUAD-AMP, the MHV-1090 input panel accepts separate high and very

high frequency signals on two separate sets of inputs. The internal crossover network is bypassed and

only the protective circuitry for the high frequency and very high frequency driver remains. Each of the

driver’s signals must have the appropriate upstream signal processing.

•Do not connect amplifiers directly to the high/very high frequency coaxial driver

inputs!

• Always use the crossover INPUTS terminal strip for high and very high frequency

input(s)

•The mid frequency driver and the low frequency enclosure are connected directly

to their own separate amplifiers regardless of mode selector switch setting.

Mounting

Attaching to Low Frequency Enclosure

The MHV-1090 attaches to the top of QSC low frequency enclosures with three 0.75” long 5/16”-18 TPI bolts. ensure the use of lock washers on all bolts.

The bolts and washers ship installed on the low frequency enclosure. 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 in the horizontal plane (see below).

Aiming

Aim the horn in the horizontal plane (pan) before tightening the three bolts securing the MHV-1090 to the low frequency enclosure. Adjust the vertical tilt

with the 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 flash-

light placed at the desired aiming point can be seen through the screen perforations in a darkened auditorium.

Where the sight holes are located:

How to use the sights:

Aim point:

HF/VHF

VHF

Mode selector switch set to

TRI-AMP and the required

HF/VHF connection:

Mode selector switch set to

QUAD-AMP and the required sep-

arate HF and VHF connections: