QSC AC-S4T – AcousticCoverage 4-Inch 2-Way 16W Surface Speaker (Pair, White)
QSC AC-S4T – AcousticCoverage 4-Inch 2-Way 16W Surface Speaker (Pair, White) is backordered and will ship as soon as it is back in stock.
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QSC AC-S4T – AcousticCoverage 4-Inch 2-Way 16W Surface Speaker (Pai...
Product Overview
The QSC AC-S4T is a 4-inch two-way AcousticCoverage Series surface-mount loudspeaker, sold as a white pair, voiced for enhanced clarity in the vocal range. With 70V/100V operation and an 8 Ω bypass, it suits paging, A/V conferencing reinforcement, and background music in spaces where ceiling mounting is impractical — walls, columns, and concrete ceilings. The compact enclosure ships with a yoke bracket and a rear Euroblock connector for fast surface installation.
Product Description
The AC-S4T pairs a 4-inch (100 mm) polypropylene woofer with a butyl-rubber surround and a 1-inch aluminum dome tweeter in a UV-treated ABS enclosure with a ported baffle tuned for low-frequency extension down to 70 Hz. The two-way design provides 130° conical coverage across a 70 Hz – 20 kHz range, handles 16 watts, and reaches a peak maximum SPL of 103 dB. A 16-watt low-saturation 70V/100V transformer offers selectable taps with an 8 Ω bypass, and a rear 4-pole Euroblock connector with parallel output simplifies loop-thru wiring. Brass inserts accept the included yoke mount, and the rotatable grille logo eases horizontal or vertical installation. Intrinsic Correction voicings are available through the Q-SYS Platform and CXD Series amplifiers. The AC-S4T is available in white and black.
Key Features
- 4-inch two-way surface speaker (pair) — Polypropylene woofer and 1-inch aluminum dome tweeter in a compact enclosure.
- 130° conical coverage — Wide coverage that reduces the number of loudspeakers required in close proximity.
- 70 Hz – 20 kHz range, 103 dB peak SPL — Ported baffle extends low frequencies for clear voice and music.
- 70V/100V with 8 Ω bypass — 16-watt transformer with selectable taps for distributed audio or low-impedance use.
- Included yoke bracket — Brass inserts and thumb bolts for simple surface mounting and aiming.
- Rear Euroblock connector — 4-pole connector with parallel output for loop-thru wiring.
Typical Applications
- Commercial meeting space — Compact surface coverage where ceiling mounting is impractical.
- Conference room — Wall- or column-mounted program audio and paging.
- Huddle room — Small-room speech and background music.
- Training room — Speech reinforcement in close proximity.
- Multi-purpose room — Flexible surface placement for changing layouts.
Technical Specifications
| Configuration | Two-way surface-mount |
| LF transducer | 100 mm (4 in) polypropylene woofer |
| HF transducer | 25 mm (1 in) aluminum dome tweeter |
| Effective frequency range | 70 Hz – 20 kHz |
| Coverage | 130° conical (500 Hz – 5 kHz) |
| Rated noise power | 16 W |
| Sensitivity | 85 dB |
| Max continuous SPL | 97 dB |
| Max peak SPL | 103 dB |
| Rated impedance | 8 Ω |
| Recommended amplifier | 32 W |
| Transformer taps | 70V: 16, 8, 4, 2, 1 W; 100V: 16, 8, 4, 2 W; 8 Ω bypass |
| Connector | 4-pole Euroblock with parallel output |
| Enclosure / grille | UV-treated ABS / powder-coated steel |
| Ingress protection | IP-44 (indoor use) |
| Net weight (each) | 2.4 kg (5.3 lb) |
| Included | Yoke mount system |
| Finish | White (RAL 9010) |
| Sold as | Pair |
Frequently Asked Questions
How many speakers are included?
The AC-S4T is sold as a white pair, each with an included yoke mount system.
Does it support 70V/100V distributed audio?
Yes. It includes a 16-watt 70V/100V transformer with selectable taps and an 8 Ω bypass for low-impedance use.
What amplifier power is recommended?
QSC recommends a 32-watt amplifier channel for the AC-S4T.
Can it be tuned within a QSC system?
Yes. Intrinsic Correction voicings are available through the Q-SYS Platform and CXD Series amplifiers.
What about warranty and support?
Refer to QSC warranty terms for coverage. For system design and purchasing questions, contact Creation Networks support.
At Creartion Networks, we do everything we can to create an excellent customer experience. This includes fast shipping and easy returns.
- Most in-stock orders placed Monday-Friday ship within 24-48 hours. General restrictions apply; please see our full shipping policy here.
- We offer a 30-day return policy from the delivery date on many products. Product restrictions apply. Restocking fees for the return of open-box items. Please see our full return policy here for more information.
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