Q-SYS SC-423C Bi or Tri-Amp 3-Way 2x15-inch Cinema Loudspeaker System with LF-4215 and MH-1075C

Developed specifically for the unique requirements of professional motion picture playback, the QSC SC-423C extends QSC’s commitment to the cinema market.

As a member of the DCS Digital Cinema Speaker Series, the SC-423C is a 3-way, selectable bi-or tri-amplified screen channel loudspeaker system comprised of two main units—the MH-1075C mid-high frequency system and the LF-4215 low-frequency system.

The MH-1075C mid-high system features a high output, horn-loaded 10" midrange cone driver and a 3" (75mm) titanium diaphragm compression driver mounted to an adjustable pan and tilt bracket. It includes a driver protection network and a passive crossover for bi-amp operation. Power limiter circuitry protects the high-frequency driver from overpowering. The MH-1075C provides extended frequency coverage for the critical midrange band, with a high-power 10" cone driver allowing operation as low as 250 Hz and advanced phase plug coupling, which enables a crossover point of up to 1800 Hz to the high-frequency horn. This ensures that most of the dialog range is reproduced by a single element, offering unmatched intelligibility.

The LF-4215 dual 15" (381mm) low-frequency enclosure is designed to address the extended low-frequency response required for cinema applications. The LF-4215 covers the frequency range from 35 Hz to 250 Hz. Close Coupled Woofers (CCW), with tight spacing between woofers, improve coupling and maintain wide coverage angles over a greater frequency range than more widely spaced designs.

The SC-423C is designed for ease of installation. The MH-1075C components come pre-assembled to reduce field assembly time, and only three bolts are required to secure the MH-1075C to the top of the LF-4215 enclosure.

Features:

• 3-way selectable, bi- or tri-amplified screen channel system
• MH-1075C provides 90° horizontal by +20° to -30° vertical coverage
• LF-4215 is constructed of MDF and is heavily braced
• Low-distortion waveguides provide highly articulate dialogue
• Shallow depth (20”) facilitates installation

Specifications:

• SC-423C:
  • Nominal Coverage: 90° horizontal x +20 to -30° vertical
  • Frequency Range: 32 Hz to 16 kHz (-6 dB)
  • Crossover Frequency: 250 and 1700 Hz, 24 dB per octave
• LF-4215:
  • Impedance: 4Ω
  • 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 W RMS
    • 2 hours of 6 dB crest factor pink noise, 50 Hz – 20 kHz, AES method: 1000 W RMS
    • Recommended Amplifier Power: 1600 W RMS 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" (381mm) high efficiency, extended bass woofers featuring 4" 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): 36" x 30" x 20.3" (470 mm x 762 mm x 516 mm)
  • Weight – Shipping: 167.5 lb (76 kg)
  • System Weight: 270.5 lb (123 kg)
  • Baffle Cut-Out: 76" x 32"
• MH-1075C:
  • Impedance: 8Ω
  • Sensitivity 1 watt/1 meter, half space:
    • Bi-amp: 105 dB
    • Tri-amp: MF 105 dB
    • HF 107.5 dB
  • Maximum Input Power:
    • 8 hours of 6 dB crest factor IEC 268 noise spectrum:
      • Bi-amp: 250 W RMS
      • Tri-amp: 275 W RMS
      • 75 W RMS
    • 2 hours of 6 dB crest factor pink noise, 50 Hz – 20 kHz, AES method: 350 W RMS
    • Recommended Amplifier Power: 800 W RMS maximum
  • Recommended Processing: 4th order LR crossover at 250 and 1700 Hz via QSC processor
  • Connectors: Barrier strip screw terminals accept up to #10 AWG stranded wire
  • Transducers: 10- high efficiency mid range, 1.5" (38mm) exit, 3" titanium diaphragm compression driver
  • Enclosure:
    • Tilt/Pan Bracket
    • ±10° vertical tilt
    • ±10° horizontal pan
  • Dimensions (HWD): 39" x 30" x 20" (990 mm x 762 mm x 508 mm)
  • Weight – Shipping: 103 lb (47 kg)