QSC AD-C4T-WH 4.5-Inch Ceiling Speaker

The AD-C4T from QSC’s AcousticDesign series is a two-way ceiling loudspeaker. AD-C4T ceiling speakers are sold in pairs.

AD-C4T is ideal in foreground and background sound reinforcement situations utilizing 70/100V or 16Ω bypass configurations. It features a high-quality 4.5" weather-treated paper cone woofer with a 1" voice coil and a .75" aluminum dome tweeter. Among its many features, Intrinsic Correction™ voicings can be deployed to optimize installation and performance.

Achieve coherent transition between transducers with Directivity Matched Transition™ (DMT), QSC’s design philosophy where the high-frequency waveguide is matched to the natural conical behavior of the woofer at the crossover point. DMT’s improved off-axis power response results in consistent 150° conical coverage.

Maintain an accurate frequency response even in 70/100V applications. The AD-C4T’s low-loss, low-saturation 30W transformer offers selectable taps (including 16Ω bypass) and incorporates a rotary selector under the magnetic snap-fit steel grille.

In addition to its durable powder-coated steel back can, the AD-C4T boasts a rugged ABS baffle that uses UV inhibitors to prevent discoloration. The magnetic grille has a removable logo ideal for non-branded installations. The AD-C4T comes with a “dog-ear” mounting system. Its conduit cover plate can be removed to access its locking 4-pole Euro-block connector; this connector accepts up to four 18AWG pairs, eliminating the hassles of star topology wiring designs.

AcousticDesign speakers are free of obtrusive branding. They’re available in black or white, as well as paintable to match any décor.

More about QSC’s AcousticDesign Series

Easy installation, flexible mounting options, and rugged, high-weather resistance are just three of the features that set QSC’s AcousticDesign™ series apart. These premium loudspeakers are designed to give contractors and integrators versatile, reliable solutions for permanent sound installations. Unified by premium audio quality and consistent tonal characteristics this series is comprised of ceiling, surface, and pendant alternatives ideal for environments where you need the perfect combination of performance, coverage, and aesthetic appeal.

QSC AD-C4T Features

• Priced individually, sold in pairs
• Consistent tonal characteristics across the entire AcousticDesign™ family in both surface or ceiling applications
• Directivity Matched Transition® (DMT) waveguide ensures smooth, uniform frequency response over the coverage area
• Snap-fit magnetic grille
• 3x double stepped, long travel dog-ear blind mount system
• Advanced Intrinsic Correction™ voicings available via Q-SYS™ Ecosystem and CXD processing amplifiers
• Low-saturation and low-loss 70/100V transformers with 16Ω bypass
• Blemish-free removable logo
• Removable conduit cover plate, also available as accessory for pre-install wiring UL1480 and UL2043 certified EN54-24 Type A
• Available in black (RAL 9011) or white (RAL 9010)

• AD-C4T 4.5" 2-Way Ceiling Speaker 2
• C-ring 2
• Tile rails 2
• Rail screws
• Euroblock connector 2
• Cut-out template 2
• Grille 2

• Effective frequency range170 Hz – 20 kHz
• Rated noise power / voltage230 watts / 22 volts (rms)
• Sensitivity [dB]387.5
• Sensitivity at 4m, 100V maximum tapTBD
• Rated coverage (-6 dB)4150° conical DMT™
• Directivity factor (Q)44.5
• Directivity index (DI) [dB]46.5
• Maximum continuous SPL [dB]5102
• Maximum peak SPL [dB]5108
• Nominal impedance [ohms]16
• Recommended amplifier60 watts
• Transformer taps / impedance
  • 16Ω (in bypass setting)
  • 3.75W (70V); 7.5W (100V) Tap: 1333Ω
  • 7.5W (70V); 15W (100V) Tap: 667Ω
  • 15W (70V); 30W (100V) Tap: 333Ω
  • 30W (70V); N/A (100V) Tap: 167Ω
• LF transducer114 mm [4.5-inch] weather resistant paper cone woofer
• HF transducer19 mm [0.75-inch] aluminum dome tweeter
• Input connector typeEuroblock connector with parallel output
• Enclosure materialABS baffle on powder coated steel back can
• Grille materialPowder coated steel
• Ingress protectionIP-34
• Operating environmentDesigned for indoor use
• Operating temperature range-20 to 50° C [-4 to 122° F]
• Cutout dimensionØ 195 mm [Ø 7.68-inch]
• Net weight2.9 kg [6.4 lb]
• Product dimensions (Diameter x Height)Ø 230 x 176 mm [Ø 9.06 x 6.93-inch]
• Shipping weight9.3 kg [20.5 lb] (pair packed)
• Shipping dimensions (H x W x D)279 x 711 x 318 mm [11 x 28 x 12.5-inch] (pair packed)
• Safety Agency
  • EN54-24: 2008 type A (No. pending)
  • UL1480, UL2043, NFPA90, NFPA70 suitable for use in air handling spaces. Transformer UL registered per UL1876, ROHS, C-Tick X000, CE compliant. Baffle meets UL94-V0 and
  • UL94-5VB flammability rating; in accordance with IEC60849 / EN60849 systems.
• Notes
  • 1: Half Space, -10dB from on-axis sensitivity
  • 2: IEC60268-5 50hz high passed noise at 2 Hrs, 16Ω
  • 3: Free-field, on-axis, 2.83V, 1m
  • 4-6: dB from on-axis, 500 Hz–5 kHz average
  • 5: Calculated from rated noise voltage and sensitivity