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ลำโพงติดเพดาน Ceiling subwoofer, 8" weather-resistant, 120Hz bypassable low pass filter, with 70V/100V transformer and 8 ohm bypass
 
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QSC AD-C81Tw-WH ลำโพงติดเพดาน Ceiling subwoofer, 8" weather-resistant, 120Hz bypassable low pass filter, with QSC AD-C81Tw-WH Ceiling Mount Speaker The QSC AD-C81TW Ceiling Mount Subwoofer System (White) is designed to supplement audio systems with low-frequency extension–it’s acoustically matched to the entire AD Series. The AD-C81TW is rated for 100 watts continuous power handling and can take up to 400-watt peaks. The AD-C81Tw has an 8″ woofer with a polypropylene cone for protection in humid environments. The driver has a synthetic rubber surround and works optimally with the large port to deliver excellent low frequency extension below 40 Hz without undesirable port turbulence.  It also features 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 AD-C81Tw is equipped with a 70/100V transformer with multiple taps and an 8-ohm bypass. 
8″ polypropylene cone wooferLarge port area for extended low-frequency performanceDefeatable passive 120 Hz low-pass filter with impedance compensation100 watts continuous power handling, 400 watts peak70/100 V multitaptransformer with 8 ohm bypassC-ring and tile rails includedSide cable entry Specs. 
| Configuration | Ceiling subwoofer, ported |  
| Woofer | 8" (20 cm) weather resistant, polypropylene cone woofer, rubber surround |  
| Frequency Range | 39 Hz - 184 Hz 28 Hz - 208 Hz useable frequency range
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| Maximum Output | Calculated Peak Output: 118 dB SPL Calculated Continuous Output: 112 dB SPL
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| Nominal Impedance | 8 ohms switchable |  
| Power Rating | 100 W |  
| SPL | 92 dB, 2.83 V, 1 m, free space (4pi) |  
| Transformer Taps | 70 V: 60, 30, 15, 7.5 W / 100 V: 60, 30, 15 W / 8 ohms selected by switch |  
| Rating | Listed UL1480, UL2043 safe for use in air handling spaces; Transformer is Listed UL1876; Compliant BS/EN 60849 safety standards |  
| Connectors | Ceramic block or 4-pin Euro terminals in fire protective sub-chamber |  
| Dimensions | Diameter: 12.6" (32 cm) Depth: 14.5" (36.83 cm)
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| Weight | 20 lb (9.1 kg) Net |  |