Product Overview

The QSC AD-S4T is a compact, high-performance 4.5-inch two-way surface-mount loudspeaker designed for professional commercial and architectural audio installations. Engineered by QSC, one of the industry’s most trusted professional audio manufacturers, the AD-S4T delivers exceptional speech intelligibility, balanced music reproduction, and reliable long-term performance in a discreet, weather-resistant enclosure.

With 50W RMS continuous power handling, 100W program power, and 200W peak capability, the AD-S4T is an ideal solution for distributed audio systems requiring consistent sound coverage in retail stores, cafés, restaurants, hotels, offices, educational facilities, and hospitality venues. Its integrated 70V/100V transformer with low-impedance bypass provides maximum installation flexibility for both constant-voltage and traditional 8-ohm audio systems.

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Professional Power Handling & Output Performance

The QSC AD-S4T is engineered for reliable daily operation in demanding commercial environments while maintaining clean, distortion-free sound.

Power Specifications

• 50W RMS Continuous Power Handling
• 100W Program Power
• 200W Peak Power
• 8 Ohm Nominal Impedance (Transformer Bypass)

Its efficient acoustic design allows the loudspeaker to reproduce both background and foreground music with excellent clarity while maintaining high speech intelligibility for paging and announcements. QSC recommends amplification up to approximately 100W for optimal performance.

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Indoor & Outdoor Compatibility

Designed for permanent commercial installations, the AD-S4T features an IP54-rated enclosure that withstands challenging indoor and outdoor environments. Its weather-resistant construction and corrosion-resistant components ensure dependable performance in long-term installations.

Ideal installation environments include:

• Retail stores
• Cafés and coffee shops
• Restaurants
• Hotels and resorts
• Corporate offices
• Educational facilities
• Museums
• Houses of worship
• Outdoor terraces
• Public venues

The speaker’s compact dimensions make it particularly suitable where aesthetics and discreet installation are equally important.

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Acoustic Design & Sound Quality

The AD-S4T utilizes a precision-engineered two-way acoustic design that provides natural music reproduction and excellent vocal clarity.

Driver Configuration

• 4.5-inch weather-treated paper cone woofer
• 0.75-inch silk dome tweeter

This driver combination delivers smooth frequency response, articulate vocals, and detailed high frequencies while maintaining balanced low-frequency performance for commercial music playback and speech reinforcement.

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Wide Coverage & Uniform Sound Distribution

The AD-S4T features a 120° conical coverage pattern, allowing installers to achieve wide and even sound distribution with fewer loudspeakers.

Benefits include:

• Uniform audio coverage
• Reduced coverage gaps
• Excellent speech intelligibility
• Fewer loudspeakers required for large areas
• Consistent listening experience throughout the venue

Its wide dispersion makes the AD-S4T especially effective in open commercial spaces where even sound coverage is essential.

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Flexible Installation Options

The integrated multi-tap transformer supports a variety of professional installation requirements.

Installation options include:

• 70V distributed audio systems
• 100V distributed audio systems
• 8 Ohm low-impedance operation
• Vertical installation
• Horizontal installation
• Indoor and outdoor mounting

The included QSC X-Mount™ mounting system allows quick installation while providing flexible aiming for precise sound coverage.

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Elegant Architectural Design

Designed to complement modern commercial environments, the AD-S4T combines professional performance with clean architectural styling.

Key design features include:

• Compact low-profile enclosure
• Modern architectural appearance
• Available in black or white
• UV-resistant painted ABS enclosure
• Powder-coated aluminum grille
• Professional mounting hardware included

Its discreet appearance blends seamlessly into hospitality, retail, educational, and corporate environments.

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Durability & Reliability

Built to QSC’s commercial standards, the AD-S4T is engineered for years of dependable service.

Durability features include:

• IP54 weather-resistant construction
• Painted ABS polymer enclosure
• Powder-coated aluminum grille
• Corrosion-resistant mounting hardware
• Long-life driver components
• Designed for continuous commercial operation

These features ensure reliable performance even in demanding indoor and outdoor installations.

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Versatile Application Scenarios

The QSC AD-S4T is ideal for a wide variety of commercial audio applications.

Retail Stores: Deliver consistent background music that enhances the customer experience.

Restaurants & Cafés: Provide clear, evenly distributed music and announcements throughout dining areas.

Hotels & Hospitality: Create premium ambience across lobbies, lounges, corridors, and outdoor terraces.

Corporate Offices: Improve speech intelligibility and background audio in reception areas and shared workspaces.

Educational Facilities: Reinforce announcements and multimedia playback in classrooms and public spaces.

Its flexibility makes it an excellent choice for virtually any distributed commercial audio installation.

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Technical Performance Summary

• Type: Two-Way Surface-Mount Loudspeaker
• Power Handling: 50W RMS / 100W Program / 200W Peak
• Woofer: 4.5-inch Weather-Treated Paper Cone
• Tweeter: 0.75-inch Silk Dome
• Nominal Impedance: 8 Ω
• Coverage Pattern: 120° Conical
• Sensitivity: 87 dB SPL
• Maximum Peak SPL: 110 dB
• Transformer: Integrated 70V/100V with Selectable Taps
• Ingress Protection: IP54
• Installation: Indoor & Outdoor
• Available Colours: Black or White

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Why Choose the QSC AD-S4T?

The QSC AD-S4T offers an excellent balance of compact size, professional sound quality, and installation flexibility. Its wide coverage, weather-resistant construction, and support for both low-impedance and constant-voltage systems make it a dependable solution for commercial audio projects of all sizes.

Whether you’re designing a background music system for a café, installing paging speakers in a retail environment, or creating a complete distributed audio solution for a hospitality venue, the AD-S4T delivers consistent, high-quality performance backed by QSC’s professional audio expertise.