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4-1/2" commercial weather-resistant surface mount speaker (White)

Item # 907ADS4TW

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Our take on the QSC AD-S4T

QSC's AD-S4T speakers are weather-resistant, so you can use them for background music and live paging of customers indoors or out. Each speaker mounts an efficient 4-1/2" woofer for detailed mids and a 3/4" silk tweeter that produces clear, detailed highs.

Make your voice (and music) heard

QSC's AD-S4T speakers are weather-resistant, so you can use them for background music and live paging of customers indoors or out. Each speaker mounts an efficient 4-1/2" woofer for detailed mids and a 3/4" silk tweeter that produces clear, detailed highs.

They're versatile and wall-mountable, so you can get good coverage for your small business without disrupting your decor. These speakers feature multi-tap transformers for use with 70-volt or 100-volt commercial audio systems, while an 8-ohm bypass setting allows use with regular home audio receivers and amplifiers.

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Product Highlights:

  • weather-resistant surface-mounted speaker with 4-1/2" woofer and 3/4" silk dome tweeter
  • handles up to 100 watts program power
  • 120° conical coverage
  • frequency response: 68-20,000 Hz (-10 dB)
  • maximum SPL: 110 dB
  • sensitivity: 87 dB
  • 8-ohm nominal impedance
  • multi-tap transformer for 70V or 100V systems
    • 30, 15, 7.5, and 3.75-watt taps
    • 8-ohm bypass setting for use with regular home audio receivers and amps
  • ABS polymer enclosure
  • paintable aluminum grille
  • mounting hardware included
  • 6-3/8"W x 10-5/16"H x 6-7/16"D
  • weight: 6.5 lbs. (each)
  • warranty: 3 years
  • Our 60-day money-back guarantee

What's in the Box:

  • 2 Surface-mount commerical loudspeakers
  • 2 Euro-style connectors
  • 2 Terminal weather protection covers
  • 2 X-mount brackets
  • Eight M4 screws
  • Spec Sheet

Hands-on research

Features and Specs

Drivers per speaker 2
Woofer Size (inches) 4.5
Tweeter Size (inches) 0.75
System Frequency response ---
Maximum SPL 110
Power Handling
Power rating 100
Peak Power rating 0
Width (inches) 6-3/8
Height (inches) 10-5/16
Depth (inches) 6-7/16
Weight 6.5 lbs

Product Research


AcousticDesign Series: QSC's AcousticDesign series offers integrators a premium quality installed sound solution where performance, coverage, and aesthetics are paramount. Combined with unprecedented ease-of-installation and high weather resistance, the AcousticDesign series provides integrators a versatile and confident install solution.

Surface Mount Speaker: The QSC AcousticDesign AD-S4T is a surface mounted 70/100V, 4.5" two-way loudspeaker system, ideally suited for a wide variety of foreground and background sound reinforcement applications.

Note: The AD-S4T is sold in pairs.

Two-Way Driver Design: The AD-S4T features a high quality 4.5" weather treated paper cone woofer on a 1" voice coil. A carefully selected horn-loaded 0.75" silk dome tweeter with 0.75" voice coil perfectly matches the sensitivity and performance of the woofer for outstanding full-range reproduction.

DMT (Directivity Matched Transition): Consistent and even 120° axisymmetric (conical) coverage is achieved through DMT (Directivity Matched Transition), a QSC innovation which matches the directivity patterns of the woofer and the high-frequency waveguide at the crossover point. The result is a coherent transition between transducers and improved off-axis response.

70/100V or 8-Ohm: The even, accurate frequency response of the AD-S4T is aided by a 30-watt low-loss, low-saturation transformer with selectable taps, including an 8Ω bypass. To preserve weather resistance, the rotary selector is located on the back of the enclosure, protected by a weather grommet.

Euro-Style Connector: The Euro-style connector allows pre-wiring of the speaker and when combined with the quick "snap-on" deployment of the loudspeaker to the mount, installation is completed in a fraction of the time required versus competitive models.

Rugged Enclosure Rated for Indoor & Outdoor Use: With rugged ABS enclosures, sealed input panel covers, and powder-coated aluminum grilles for weather resistance, the AcousticDesign surface mounted series exceed IEC60529 IP-54 ratings for dust and splash resistance.  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 & Low Temperature: Tested to QSC internal standards between -20° and 50° C.

X-Mount System: Installers will appreciate the award-winning X-Mount system included with each full-range AcousticDesign model. This ingenious mounting solution achieves unprecedented ease-of-installation in horizontal, vertical, wall, or ceiling deployments. Knurled surfaces at the pivot planes ensure the load will not drift or sag over time. Articulation marks allow pre-configuration of the X-Mount while on the ground with no special tools required. Once secure, the loudspeaker installs in seconds, allowing the installer to work safer, smarter, and faster.

Black or White Finish + Paintable: The AcousticDesign series feature a stylish appearance free of obtrusive logo adornments for aesthetically sensitive installations. AcousticDesign surface loudspeakers are available in QSC standard black or white, and may be painted to match any decor.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

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Why did you buy this?

This item was recommended by Rob for my outdoor speakers. [ Andrew  Nov 19, 2017 ]