The QSC AD-C.SUB-BK 6.5-Inch Small-Format Passive Ceiling Subwoofer (Black) is a compact ceiling subwoofer designed to provide refined bass depth and clarity for background music applications, including at lower listening levels.
Part of the AcousticDesign Series, the AD-C.SUB-BK supports flexible SUB/SAT system configurations, 70V/100V distributed audio, and 4-ohm bypass operation. Its built-in high-pass filtered outputs allow connection of up to four compatible AcousticDesign satellite loudspeakers, helping simplify system wiring and installation.
QSC AD-C.SUB-BK Features
- 6.5-inch passive subwoofer designed to deliver clear, refined low-frequency performance.
- Selectable 70V/100V transformer taps with 4-ohm bypass for flexible system configurations.
- Four built-in high-pass filtered outputs for compatible AcousticDesign SUB/SAT satellite speakers.
- Magnetic snap-fit grille, locking 4-pole Euroblock connectors, and a blind-mount ceiling installation system.

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HDTV Supply has QSC Level 1 certified expertise. Our team has completed QSC Level 1 Training, demonstrating foundational knowledge of the QSC platform, including system design, hardware and software, programming, and troubleshooting.
This training helps us provide knowledgeable product guidance when customers are selecting and deploying Q-SYS solutions. When you purchase Q-SYS products from HDTV Supply, you are working with a team that understands the Q-SYS platform and can help you make informed product and system decisions.
Why Buy the QSC AD-C.SUB-BK from HDTV Supply?
HDTV Supply offers QSC audio solutions for commercial and professional installations. Contact our team for assistance with product selection and system compatibility.
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Have questions about the QSC AD-C.SUB-BK 6.5-Inch Small-Format Passive Ceiling Subwoofer? Our team can help with product information and installation considerations.
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QSC AD-C.SUB-BK Specifications
| Speaker | |
|---|---|
| Model | AD-C.SUB-BK |
| Active/Passive | Passive |
| Number of Included Speakers | 1 |
| Speaker Configuration | Subwoofer |
| Power Handling | 100 W |
| Recommended Amplifier Power | 100 W |
| 70V Transformer Taps | 100 / 50 / 25 / 12.5 W |
| 100V Transformer Taps | 100 / 50 / 25 W |
| Bypass Operation | 4 Ohms |
| Impedance | 4 Ohms |
| Enclosure Type | Bass-reflex (as listed in the supplied specifications; verify against manufacturer documentation) |
| Drivers | |
| Low-Frequency Driver | 1 × 6.5-inch (165.1 mm) woofer |
| Performance | |
| Frequency Range | 45 Hz–150 Hz |
| Maximum SPL | 111 dB peak; 105 dB continuous |
| Sensitivity | 86 dB |
| Coverage Angle | 250° conical (as supplied; verify with manufacturer) |
| Directivity Index | 1.8 dB |
| Directivity/Q Factor | 1.5 |
| Connectivity | |
| Inputs/Outputs | 3 × locking 4-pole block speaker input/output connectors |
| Maximum Wire Gauge | 12 AWG |
| Physical and Environmental | |
| Certifications | CE, RoHS, UL |
| Environmental Resistance | IP34 dust/water resistance (as supplied) |
| Operating Temperature | -4°F to 122°F (-20°C to 50°C) |
| Color | Black |
| Mounting | In-ceiling |
| Construction Materials | ABS, steel |
| Dimensions | 13.4 × 10.4 inches (340.36 × 264.16 mm) |
| Weight | 19.2 lb (8.7 kg) |
QSC AD-C.SUB-BK Manuals and Documentation
Questions & Answers
QSC AD-C.SUB-BK Warranty
Please contact HDTV Supply or consult QSC's official warranty documentation to confirm the applicable warranty coverage for this product.
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