QSC HF-75 Handleiding
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*TD-000149-00*
Cinema Loudspeaker Systems User Manual
HF-75 High Frequency Component
Introduction
The HF-75 is the high frequency component of the SC-412 and SC-422 two-
way, biamplified screen channel loudspeakers for high performance cinema
applications. The system is shipped as two separate components: the HF-75
high frequency system and the LF-4115 or LF-4215 woofer system.
The HF-75 high-frequency system features a large format, 3” (75mm) tita-
nium diaphragm compression driver mounted on a custom designed high-
frequency cinema horn with an adjustable pan and tilt bracket. The horn fea-
tures broad horizontal and vertical coverage angles to ensure coverage of
every seat in the auditorium. The horn is a low-distortion waveguide provid-
ing highly articulate dialogue without the “honky” coloration associated
with conventional horn loudspeakers.
The HF-75 includes a driver protection and equalization network. DC block-
ing capacitors protect against DC or low-frequency signals that would likely
destroy an unprotected driver. Power limiter circuitry protects the driver from
over-powering and a response correction filter smoothes the frequency
response of the horn/driver combination. The driver and equalization net-
work provides for more reliable operation, ensuring the show will go on.
The HF-75 components come pre-assembled to reduce field assembly time.
Three bolts are all that are required to secure the HF-75 to the top of the low
frequency enclosure.
Mounting
Refer to the illustration for mounting information. The HF-75 attaches to the
top of the LF-4115 or LF-4215 with three 5/16-18 bolts, 0.75” long, with lock
washers. We recommend the use of serviceable thread locking compound
when installing the bolts to prevent loosening due to vibration. Aim the horn
in the horizontal plane (pan) before tightening. Adjust the vertical tilt with
the bracket adjustment.
Install in accordance with QSC Audio Product’s instructions
and a licensed, professional engineer. Only use attachments,
mounts, accessories, or brackets specified by QSC Audio
Products, Inc. Refer all servicing to qualified personnel. Ser-
vicing is required when the apparatus has been damaged in
any way.
WARNING! Before placing, installing, rigging, or suspending
any speaker product, inspect all hardware, suspension, cab-
inets, transducers, brackets and associated equipment for
damage. Any missing, corroded, deformed or non-load rated
component could significantly reduce the strength of the
installation, placement, or array. Any such condition
severely reduces the safety of the installation and should be
immediately corrected. Use only hardware which is rated for
the loading conditions of the installation and any possible
short-term unexpected overloading. Never exceed the rating
of the hardware or equipment. Consult a licensed, profes-
sional engineer when any doubt or questions arise regarding
a physical equipment installation.
TD-000149-00 rev.D
© Copyright 2003, 2004 QSC Audio Products, Inc.
QSC® is a registered trademark of QSC Audio Products, Inc.
“QSC” and the QSC logo are registered with the U.S. Patent and Trademark Office
1675 MacArthur Blvd., Costa Mesa, CA, 92626 USA
Main Number (714) 754-6175 Sales & Marketing (714) 957-7100 or toll free (USA only) (800) 854-4079
Customer Service(714) 957-7150 or toll free (USA only) (800) 772-2834
Connections
The HF-75 has barrier strip screw terminals that accept up to #10 AWG stranded loudspeaker wire.
HF INPUT Terminals
Connect the amplifier’s output signal to the loudspeaker’s HF INPUT terminals. Observe proper polarity; amplifier + signal to loud-
speaker + HF INPUT, amplifier - signal to loudspeaker - HF INPUT. Use the largest wire size and shortest length for the application.
NOTE! Do not apply full range signal to the HF-75! There is no crossover in the HF-75, only a compensation/
delay network. All required signal processing must be done upstream of the HF-75. Maintain proper loud-
speaker connection polarity throughout the entire system for maximum performance.
HF OUTPUT Terminals
The HF OUTPUT terminals are factory-connected to the compression driver. These terminals should ONLY be connected to the HF-
75’s compression driver.
QSC DCM or other active crossover
HF-75 compression driver
Amplifier
Processed high frequency
program signal
HF-75 connec-
tion terminals
Note: The HF-75 connection
enclosure does not contain a
crossover network! Ensure
only high frequency signal is
applied to HF INPUT termi-
nals or compression driver
damage will occur.
HF-75 Specifications (subject to change without notice)
Frequency Range: 600 - 16k Hz (-6 dB, full space)
Nominal Coverage: 90° horizontal X +15° to -35° vertical (50° total, adjustable mount provides for vertical plane adjustments. The
horizontal plane can be adjusted by altering mounting position on the LF-4215 enclosure before tightening bolts.
DI: 9.0 dB (600 to 16,000 Hertz average)
Q: 8.0 (600 to 16,000 Hertz average)
Maximum Output: 133 dB SPL calculated peak, 1 meter, half space.
Impedance: 8 ohms nominal
8.0 ohms minimum at 3,000 Hertz
104 ohms maximum at 475 Hertz
Maximum Input Power: 60 watts rms (100 hours of 6 dB crest factor pink noise, 500 to 20,000 Hertz, IEC method)
80 watts rms (2 hours of 6 dB crest factor pink noise, 60 - 6,000 Hertz, AES method)
Sensitivity: 108 dB half space, 1 watt, 1 meter
Crossover Frequency: 700 Hertz or higher, 24 dB per octave
Connectors: Barrier strip screw terminals accept up to #10 AWG stranded wire. Four terminals: (two HF INPUT and two post
compensation HF OUTPUT). HF OUTPUT factory wired to compression driver.
Transducers: 1.5” (38mm) exit, 3.0” (76mm) titanium diaphragm compression driver.
Mounting Hardware: Attaches to top of low frequency cabinet using three 5/16”-18 x 3/4” long bolts.
Size: 30” wide X 16” high X 20” deep (762mm X 406mm X 508mm)
Weight: 50 lbs. (shipping), 40 lbs. (net), 22.7/18.4 kilograms
SPL and Impedance vs. Frequency
SPL (dB)
Frequency (Hertz)
Impedance (Ohms)
Impedance
SPL
Product specificaties
| Merk: | QSC |
| Categorie: | Speaker |
| Model: | HF-75 |
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