QSC AD-S4T AcousticDesign 4.5-Inch Surface Mount Speaker

The AD-S4T from QSC’s AcousticDesign series is a two-way surface-mounted loudspeaker. It’s ideal in foreground and background sound reinforcement situations utilizing 70/100V or 16Ω bypass configurations. The AD-S4T features a high-quality weather-treated paper cone woofer with a 1" voice coil and a .75" silk dome tweeter that perfectly matches the sensitivity and performance of the woofer for outstanding full-range reproduction. 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 120° conical coverage.

Maintain an accurate frequency response even in 70/100V applications. The AD-S4T’s low-loss, low-saturation 30W transformer offers selectable taps (including 8Ω bypass) and incorporates a rotary selector on the enclosure back, protected from the elements by a weather-resistant grommet. In addition to rugged ABS enclosures characteristic of AcousticDesign speakers, surface-mount models boast sealed input panel covers and weather-resistant powder-coated aluminum grilles, allowing them to exceed IEC60529 IP-54 ratings for dust and splash resistance.

Install your speaker safely, securely, and swiftly. Each AcousticDesign model comes with the award-winning X-Mount™ system for simple and easy wall or ceiling installation in either horizontal or vertical orientations. The pivot planes feature knurled surfaces to prevent drifting or sagging over time, while articulation marks allow you to preconfigure the mounting system on the ground—without requiring special tools.

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-S4T Features

• Priced individually, sold in quantities of 2
• DMT™ (Directivity Matched Transition) ensures smooth, uniform frequency response over the coverage area
• X-Mount™ system enables the loudspeaker to be easily installed and deployed at a variety of angles with no slippage over time
• Advanced voicing filter sets using QSC Intrinsic Correction™, available through either Q-Sys processing or CXD amplifier platforms
• Low-saturation and low-loss 70/100V transformers with 8Ω bypass
• Lightweight ABS enclosures offer long-term durability and lasting good looks
• Sealed input panel cover and powder coated aluminum grilles for added weather resistance
• Meets IEC60529 IP-54 for dust and splash resistance

• AD-S4T 4.5-Inch Surface Mount Speaker2

• Effective frequency range1 68 Hz - 20 kHz
• Rated noise power / voltage250 watts / 20 volts (rms)
• Broadband sensitivity387 dB SPL
• Coverage angle (-6 dB)120° conical DMT™
• Directivity factor (Q)6
• Directivity Index8 dB
• Maximum continuous SPL4104 dB
• Maximum peak SPL4110 dB
• Rated impedance8 ohms
• Recommended amplifier power (loudspeaker "program" power)100 watts
• Transformer taps
  • 70V: 30, 15, 7.5, 3.75W and 8Ω bypass
  • 100V: 30, 15, 7.5W and 8Ω bypass
• HF transducer0.75-inch silk dome tweeter / 0.75-inch voice coil, horn loaded
• LF transducer4.5-inch weather resistant paper cone woofer, 1-inch / 25 mm voice coil
• Input connector typeEuroblock connector with parallel output terminals
• Enclosure materialPainted ABS polymer
• Grille materialPowder coated aluminum
• X-Mount materialPowder coated aluminum
• Ingress protection IP-54
• Operating environment Designed for indoor and outdoor use
• Testing
  • The AD Series loudspeakers qualified for outdoor use using the following tests:
  • Salt fog: MIL-STD-810G Method 509.5 for 100 hrs.
  • Humidity: MIL-STD-810G Method 507.5, Natural cycle B2, cyclic high RH for 7 days
  • High and low temperature: tested to QSC internal standards between -20° and 50°C
• Net weight6.5 lbs (2.9 kg)
• Product dimensions (HxWxD)10.3x6.34x6.42" (261x161x163mm)
• Shipping weight16.8 lbs (7.65 kg), pair packed
• Shipping dimensions (HxWxD)15.5x10.3x18" (394x261x458mm), pair packed
• Notes
  • 1 Free-field, -10 dB from on-axis sensitivity
  • 2 IEC60268-1 noise signal for 2 hours
  • 3 On-Axis, free-field sensitivity, 2.83V, 1 m
  • 4 Calculated from rated noise voltage and sensitivity