QSC AD-S402T – AcousticDesign 4-Driver Columnar Surface-Mount Loudspeaker (White)

Product Overview

The QSC AD-S402T is a four-driver columnar surface-mount loudspeaker built for speech intelligibility in acoustically difficult commercial spaces. Part of the AcousticDesign Series, it serves transportation terminals, lecture halls, atriums, government and education spaces, and houses of worship.

Operating on 70V/100V distributed lines or a 16-ohm bypass, this white column loudspeaker uses QSC's PTT (Progressive Taper Topology) network to reduce side lobing and tighten vertical directivity where reverberation challenges clarity.

Product Description

The AD-S402T houses four weather-treated 2.75-inch paper-cone transducers in a slim column. Its PTT network creates a passive curvature of the array line that greatly reduces the side lobes common to straight arrays, delivering a rated 150° horizontal by 35° vertical coverage and an accurate 110 Hz to 20 kHz response.

A low-loss, low-saturation transformer with selectable taps (and a 16-ohm bypass) maintains frequency response on distributed lines, set on a rotary selector behind the sealed input cover. A locking 4-pole Euroblock connector with an attached wire-sealing gland nut secures cabling, and a quick-hang pan/tilt bracket reduces live-load installation time close to the wall.

Constructed of powder-coated aluminum with stainless-steel hardware, the AD-S402T exceeds IEC60529 IP-54 for dust and splash resistance and is UL1480A certified. The enclosure and grille are paintable to match decor, and Intrinsic Correction voicings deploy via the Q-SYS Ecosystem including CX-Q amplifiers. For longer throw and higher output, consider the QSC AD-S802T.

Key Features

• PTT directivity control — Progressive Taper Topology curves the array passively to reduce side lobes and sharpen vertical control for clear speech in reverberant rooms.
• Four-driver column array — Four weather-treated 2.75-inch transducers provide a tall, narrow vertical pattern ideal for intelligibility-critical spaces.
• 70/100V operation with 16-ohm bypass — A low-loss transformer supports distributed audio plus a low-impedance bypass tap for amplifier-direct channels.
• Quick-hang pan/tilt bracket — A close-to-wall bracket with a zero-pan locking screw reduces high-reach live-load time and supports wind-load installs.
• Sealed, secured wiring — A locking 4-pole Euroblock with a wire-sealing gland nut keeps moisture away from terminations and accepts conduit when required.
• IP54 aluminum construction — Powder-coated aluminum with stainless-steel hardware exceeds IEC60529 IP-54 and is UL1480A certified for indoor or outdoor use.
• Paintable, low-profile design — The unobtrusive enclosure and grille can be painted to match any decor.
• Q-SYS Intrinsic Correction ready — Optimized voicings deploy through the Q-SYS Ecosystem including CX-Q Series amplifiers.

Typical Applications

• Government space
• Commercial meeting space
• Multi-purpose room
• Training room
• Auditorium
• House of worship

Technical Specifications

Competitor Comparison

Frequently Asked Questions

Why choose a column loudspeaker like the AD-S402T?
Column arrays narrow vertical dispersion to direct sound at listeners rather than reflective floors and ceilings, improving speech intelligibility in reverberant rooms such as atriums, terminals, and houses of worship.

Does it support 70V/100V distributed systems?
Yes, it includes a low-loss transformer with selectable 70V/100V taps and a 16-ohm bypass for low-impedance amplifier channels.

Can the AD-S402T be painted and installed outdoors?
The paintable powder-coated aluminum enclosure exceeds IEC60529 IP-54 and is UL1480A certified, supporting painted indoor or covered outdoor installation.

What warranty and support come with this loudspeaker?
QSC installed loudspeakers are covered under QSC's standard limited warranty; refer to QSC's published warranty terms for the current coverage period applicable to this model. Creation Networks provides pre- and post-sale support for system design and integration questions.