QSC AD-C81Tw 8" Ceiling Mount Subwoofer

Designed to supplement audio systems with low-frequency extension, QSC's AD-C81Tw is acoustically matched to the entire AcousticDesign Series. Rated for 100W continuous power handling and able to take up to 400W peaks, this subwoofer is a great compliment to any of the ceiling mount or surface mount AD Series models.

The 8" woofer is equipped with a polypropylene cone for protection in humid environments. The driver features a synthetic rubber surround and works optimally with the large port to provide excellent low frequency extension below 40 Hz without undesirable port turbulence. This highly efficient design measures 92 dB SPL sensitivity.

The AD-C81Tw has a built in passive low pass filter set at 120 Hz. The filter is defeatable from the front baffle to allow the use of outboard crossovers.

The baffle and mounting tabs are molded from high-impact polystyrene. The rear enclosure is heavy gauge, powder-coated steel. The attractive aluminum grille is backed with an acoustically transparent white cloth. The input cup is mounted on the side of the enclosure to reduce the amount of vertical clearance necessary to install the speaker. The input cup cover features a conduit attachment point plus an additional knockout for daisy-chain wiring. Input signal connection is made with a high-temperature-resistant ceramic screw terminal for compliance with European safety standards.

The AD-C81Tw is factory shipped with C-rings and tile rails for installation. New construction rings (ADCNCS) and mud rings (ADC-MRS) are also available separately. The AD-C81Tw is equipped with a 70/100 V transformer with multiple taps and an 8 Ω bypass.

Features

• Defeatable passive 120 Hz low-pass filter with impedance compensation
• Side cable entry

Specifications

• Configuration: Ceiling subwoofer, ported
• Low-frequency Transducer: 8" (20 cm) weather-resistantpolypropylene cone woofer, rubber surround
• Frequency Range (measured free field response):
  • Frequency Response (-6 dB): 39 Hz - 184 Hz
  • Useable Frequency Range (-10 dB): 28 Hz - 208 Hz
• Filter: 120 Hz low pass, passive, bypassable
• Maximum Output*:
  • Calculated Peak Output: 118 dB SPL
  • CalculatedContinuous Output: 112 dB SPL
  • * Calculated SPL at 1 m, (free space, 4 pi),speaker operating at rated RMS power with pink noise within specifiedfrequency range
• Nominal Impedance: 8 Ω switchable
• Power Rating:
  • RMS Power Handling**: 100W (100 hoursIEC)
  • Recommended Max Amp Power: 200W RMS
  • ** Maximum input power tested inaccordance with IEC 268-5 recommendations, 50 Hz - 20 kHz band limiting, 6 dB signal crest factor
• Sensitivity: 92 dB, 2.83 V, 1 m, free space (4pi)
• Transformer Type: Custom low distortion laminated core, wide bandwidth design
• Transformer Taps:
  • 70 V: 60, 30, 15, 7.5W
  • 100 V: 60, 30, 15W
  • 8 Ω selected by switch
• Environmental: Exceeds Mil Spec 810 for humidity, salt spray and dust; IEC 60529 IP-X3 splash rating
• Agency Rating: Listed UL1480, UL2043 safe for use in air handling spaces
  • Transformer is Listed UL1876
  • Compliant BS/EN 60849 safety standards
• Enclosure Material: Injection molded, high-impact polystyrene baffle on a steel enclosure
• Finish: White (paintable)
• Grille: Painted aluminum
• Connectors: Ceramic block or 4-pin Euro terminals infire protective sub-chamber
• Mounting Hardware: Rails and C-ring for ceiling tileinstallation
• Net Weight: 20 lbs. (9.1 kg)
• Shipping Weight: 28 lbs. (12.7 kg)
• Available Accessories (sold separately): Mud ring bracket (ADC-MRS), newconstruction bracket (ADC-NCS)