Q-SYS SC-422C High Power Bi-Amp 2-Way 2x15-inch Cinema Loudspeaker System with HF-75C and LF-4215

Developed specifically for the unique requirements of professional motion picture playback, the SC-422C extends QSC’s commitment to the cinema market. As a member of the DCS Digital Cinema Speaker Series, the SC-422C is a 2-way, bi-amplified screen channel loudspeaker system comprised of two main units—the HF-75C high-frequency system and the LF-4215 low frequency system. 

The HF-75C high-frequency system features a large format, 3” (75mm) titanium diaphragm compression driver mounted on a custom designed high-frequency cinema horn with an adjustable pan and tilt bracket. The HF-75C includes a driver protection and equalization network. DC blocking capacitors protect against DC or low-frequency signals that would likely destroy an unprotected driver. Power limiter circuitry protects the driver from overpowering and a response correction filter smoothes the frequency response of the horn/driver combination. The driver and equalization network provides for more reliable operation, ensuring the show will go on.

The LF-4215 dual 15” (381mm) low frequency enclosure is designed specifically to address the extended low-frequency response required for cinema applications. The LF-4215 covers the frequency range from 35 Hz to 1000 Hz, depending upon the high-frequency system requirements. Close Coupled Woofers (CCW), with their tight spacing between woofers, improves coupling and keeps coverage angles wide over a greater frequency range than more widely spaced designs.

The SC-422C is designed for ease of installation. The HF-75C components come pre-assembled to reduce field assembly time. Three bolts are all that are required to secure the HF-75C to the top of the LF-4215 enclosure.

Features:

• Two-way, bi-amplified screen channel system
• HF-75C provides 90° horizontal by +20° to -30° vertical coverage
• LF-4215 enclosure is constructed of MDF and features two single woofer chambers
• Low-distortion waveguide provides highly articulate dialogue
• Shallow depth (20-inch) facilitates ease of installation

Specifications:

• SC-422C:
  • Nominal Coverage: 90° horizontal by +20 to -30° vertical
  • Frequency Range (-6 dB): 38 Hz–16 kHz
  • Crossover Frequency: 700 Hz, 24 dB per octave
• LF-4215:
  • Impedance: 4 ohms
  • Sensitivity 1 watt/1 meter, half space: 99.5 dB
  • Maximum Input Power:
    • (8 hours of 6 dB crest factor IEC 268 noise spectrum): 800 watts continuous
    • (2 hours of 6 dB crest factor pink noise, 50 Hz–20 kHz, AES method): 1000 watts continuous
  • Recommended Amplifier Power: 1600 watts continuous maximum
  • Recommended Processing: Subsonic filter below 30 Hz, >18 dB per octave
  • Connectors: Barrier strip screw terminals accept up to #10 AWG stranded wire
  • Transducers: Two 15-inch (381 mm) high efficiency, extended bass woofers featuring 4-inch copper voice coils
  • Enclosure: Quasi B4 alignment, ported enclosure with fully flared ports, symmetrical port design, tuned to 36 Hz, constructed of MDF and heavily braced. Features vandal-resistant woofer mounting bolts
  • Dimensions:
    • (HWD) inches: 30 × 36 × 20.3
    • (HWD) mm: 910 x 762 x 516
  • Net Weight: 172 lb (78 kg)
  • System Weight: 257 lb (117 kg)
  • Baffle Cut-Out: 111.6-inch × 32-inch
• HF-75C:
  • Impedance: 8 ohms
  • Sensitivity 1 watt/1 meter, half space: 107.5 dB
  • Maximum Input Power:
    • (8 hours of 6 dB crest factor IEC 268 noise spectrum): 60 watts continuous
    • (2 hours of 6 dB crest factor pink noise, 50 Hz–20 kHz, AES method): 80 watts continuous
  • Recommended Amplifier Power: 100 watts continuous maximum
  • Recommended Processing: 4th-order LR crossover at 700 Hz via QSC processing
  • Connectors: Barrier strip screw terminals accept up to #10 AWG stranded wire
  • Transducers: 1.5-inch (38 mm) exit, 3-inch titanium diaphragm compression driver
  • Enclosure:
    • Tilt/Pan Bracket
    • ± 10º vertical tilt
    • ± 10º horizontal pan
  • Dimensions:
    • (HWD) inches: 30 × 16 × 20
    • (HWD) mm: 406 x 762 x 508
  • Net Weight: 40 lb (18.4 kg)