QSC Audio SC-2150 - Manual

Developed specifically for the unique requirements of
professional motion picture playback in smaller cinemas,
QSC extends its commitment to the cinema market with the
introduction of the SC-2150 Screen Channel Loudspeaker.
As a member of QSC’s DCS (Digital Cinema Speaker) Series,
the SC-2150 offers high-power handling, excellent sensitivity,
and extended bass response in a very compact enclosure.
The SC-2150 is a 3-way, selectable passive full-range or
bi-amplified screen channel loudspeaker system comprised
of two main units – the mid-high frequency system and
the low-frequency enclosure. The components are easily
assembled on-site via a pan and tilt bracket that mounts the
mid-high components to the top of the LF enclosure.
The mid-high system features a high output, horn loaded
6.5" midrange cone driver and a 1.4" (35.6 mm) diaphragm
compression driver mounted to an adjustable pan and tilt
bracket. QSC’s patented Cine-Sight simplifies aiming of the
horns for proper audience coverage.
The dual 15" (381 mm) low-frequency enclosure is
designed specifically to address the extended low-frequency
response required for cinema applications. The compact
enclosure is only 14.5" (368 mm) deep, reducing the space
required behind the screen. The enclosure is constructed
of high quality MDF panels and features Single Woofer
Chambers (SWC, separate chambers for each transducer). In
the rare event of a transducer theft or failure, this prevents
over-excursion of the remaining transducer caused by
improper box loading.
With Symmetrical Port Loading (SPL), bass ports are evenly
spaced on each side of the transducers, making internal
pressure more uniform across the back surface of the
transducer. This prevents the cone from being displaced
to one side or another by unbalanced forces, reducing the
chance of driving the voice coil out of the center of the gap
at high power.
The SC-2150 includes a driver protection network and a
passive crossover for bi-amp and full passive operation.
Power limiter circuitry protects the high-frequency and mid-
frequency drivers from overpowering. A simple switch setting
determines the operating mode and eliminates dual inventory
and ordering issues associated with fixed bi-amp or passive
models. The 3-way design provides exceptional coverage of
the critical midrange band for improved dialog intelligibility.
The SC-2150 is designed for ease of installation. Three bolts
are all that are required to secure the mid-high system to the
top of the LF enclosure. A pre-wired harness and connector
plugs into the terminal plate to provide all electrical
connections to the mid-high system. Pre-installed rubber
feet speed installation, thereby reducing labor costs.
SC-2150
Cinema Loudspeaker System
Specifications SC-2150
Nominal Coverage (-6 dB) 90° horizontal x 40° vertical
Frequency Response 1 (-6 dB) 38 Hz – 20 kHz
Frequency Range 1 (-10 dB) 32 Hz – 20 kHz
Crossover Frequencies (passive) 500 Hz & 2200 Hz
Crossover Frequencies (bi-amp) 500 Hz active, 24 dB /octave LF to mid-high, 2200 Hz passive
Impedance (passive mode)
4Ω
Maximum Input Power 2
(passive mode)
500 W RMS
Sensitivity (1 watt / 1 meter,
passive mode)
99 dB SPL
Calculated Maximum Output 3
(passive mode)
126 dB continuous, 132 dB peak SPL at 1 m
LF Enclosure Mid-High System
Impedance 4Ω 8Ω
Sensitivity (1 watt / 1 meter,
half space)
100 dB 102 dB
Maximum Input Power 500 W RMS 4 80 W RMS 5
Maximum Recommended
Amplifier Power
1000 W RMS 320 W RMS
Recommended Processing Subsonic filter below 30 Hz,
>18 dB per octave
4th order LR crossover at 500 Hz
via QSC DCM or QSControl.net™
Connectors Barrier strip screw terminals accept
up to #10 AWG stranded wire
Factory installed NL4 plug for
connection to input terminal plate
Transducers Two 15" (381 mm) high efficiency,
extended bass woofers featuring
3" voice coils
6.5" high efficiency mid range,
1" (38 mm) exit, 1.4" (35.5 mm)
diaphragm compression driver
Enclosure Ported enclosure with symmetrical port
design, tuned to 40 Hz, constructed of
MDF and heavily braced
Tilt/Pan Bracket
-20 to +10° vertical tilt
± 15° horizontal pan
Dimensions (HWD) 38.3" x 30" x 14.5"
(972 mm x 762 mm x 368 mm)
17.3" x 16.3" x 6.8"
(440 mm x 414 mm x 173 mm)
Weight – Net 107 lb / 48.5 kg 10 lb / 4.5 kg
Weight – Shipping 121 lb / 54.9 kg 12 lb / 5.4 kg
System Weight – Net 117 lb / 53.1 kg
System Weight – Shipping 133 lb / 60.3 kg
Baffle Wall Cut-Out 30.5" x 56.1" (775 mm x 1425 mm) contoured to the perimeter of MF - HF horns
Features
• Optimized design for smaller cinemas - up to 55 ft (16.6 m) in length
• 3-way selectable, bi-amplified or full passive screen channel system
• Heavily braced, MDF low-frequency enclosure for extended bass response
• 6.5" horn loaded midrange driver provides highly articulate dialogue
• Shallow 14.5" (368 mm) depth reduces space required behind the screen
• Advanced crossover circuitry protects the HF and MF drivers from over-
powering and excessive low-frequency program material
1) Half-space with recommended QSC processing
2) IEC 268-5, 2 hrs, Power = Vrms^2/Znom
3) Calculated SPL at 1 m, full-space, speaker operating at rated continuous power handling, 6 dB crest factor
4) AES2-1984, 40 Hz – 400 Hz, 2 hrs, Power = Vrms^2/Znom
5) Pink noise, 500 Hz – 20 kHz, 6 dB crest factor, 2 hrs, Power = Vrms^2/Znom