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The black QSC AD-C.SUB 6.5" Small-Format Passive Ceiling Subwoofer is a fully integrated, sealed subwoofer system designed for background music applications that require refined depth and clarity even at lower volume settings.

The AcousticDesign Series of installation subwoofers has been designed for trouble-free operation and versatility. SUB/SAT loudspeakers have been specifically designed to be mix-and-match capable. Any combination of subwoofer may be paired with any satellite in the SUB/SAT line.

The AD-C-SUB maintains an accurate frequency response when used with 70/100V applications by use of a low-loss, low-saturation 100W transformer with selectable taps, including 4-ohm bypass, using a rotary selector located under the snap-fit magnetically attached powder coated steel grille. Additionally, the sub includes built-in, high-pass filtered outputs for connecting up to four AcousticDesign SUB/SAT satellite loudspeakers, allowing for a reduced setup time, amplifier channel count, and allows for ease of wiring.

Intrinsic Correction voicings that optimize performance and speed the install process are easily deployed via the MP-M Series music and paging mixers as well as Q-SYS Platforms including CXD-Q Series amplifiers, as part of a complete QSC systems solution. The AD-C.Sub ships with C-ring and tile rails, rail screws, three Euroblock connectors, a cut-out template, and a magnetic grille.

More Information


  • Dual voice-coil for improved thermal dissipation and higher output
  • Low saturation and low-loss 70 / 100 V transformers with 4 Ω bypass
  • 4x built-in high-pass filtered outputs
  • Snap-fit magnetic grills
  • Locking 4-pole Euroblock connectors
  • Removable conduit cover plate
  • 4x double stepped, long travel dog-ear blind mount system
  • Intrinsic Correction™ voicings available via MP-M Series mixers and Q-SYS Platform
  • Available in black (RAL 9011) or white (RAL 9010)
  • UL1480 and UL2043 certified

Technical Specification


Active or Passive Passive
Number of Included Speakers 1
Speaker Configuration Subwoofer
Power Handling 100 W
Recommended Amplifier Power 100 W
Constant Voltage / Transformer Taps 70 V:
100 / 50 / 25 / 12.5 W

100 V:

100 / 50 / 25 W or 4 Ohms Bypass
Impedance 4 Ohms
Enclosure Type Bass-Reflex
LF Driver 1 x 6.5" / 165.1 mm Woofer
Frequency Range 45 Hz to 150 Hz
Maximum SPL 111 dB (Peak)
105 dB (Continuous)
Sensitivity 86 dB
Coverage Angle 250° (Conical)
Directivity 1.8 dB (Directivity Index)
1.5 (Directivity/Q Factor)
I/O 3 x Block 4-Pole Speaker Input/Output (Locking)
Maximum Wire Gauge 12 AWG
Certifications CE, RoHS, UL
*as per Manufacturer
Water / Weather Resistance Moisture Resistant
Environmental Protection Advertised as Dust Resistant/Moisture Resistant
*Manufacturer Testing: IP34
IP Rating IP34
Operating Temperature -4 to 122°F / -20 to 50°C
Color Black
Mounting 1 x In-Ceiling
Construction Material ABS, Steel
Dimensions 13.4 x 10.4" / 340.36 x 264.16 mm
Weight 19.2 lb / 8.7 kg


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