3S321C subwoofer specs
Cardioid subwoofer
The 321C is an actively driven high performance cardioid subwoofer. It houses three
21” long excursion neodymium transducers, two transducers in a bass-reflex design
facing to the front and one transducer in a bass-reflex design radiating to the rear.
321C is designed to deliver high quality, high impact sound reinforcement of infra-low
frequencies for a wide variety of live music and A/V support applications where
maximum SPL and extended low-frequency reproduction capabilities in the
foundation octave at lowest audible frequencies is required. The cardioid dispersion
pattern resulting from this approach avoids unwanted energy behind the system that
reduces the reverberant field at low frequencies and provides the greatest accuracy of
low frequency reproduction. The 321C can only be used in ground stacked
configurations in conventional left/right setups as well as arranged in an infra
subwoofer array. The 321C cabinet is made of high grade Baltic birch plywood with
advanced bracings inside and has impact and weather resistant finish. The front and
rear of the loudspeaker cabinet is protected by a powder-coated HEX punched steel
grill backed by acoustically transparent foam. Each side panel incorporates six
handles. Four 100 mm wheels and two NL4 connectors are mounted at the rear.
Frequency Range (-10 dB):
Frequency Response (-3 dB):
Recommended Bandpass:
System Input Rating:
System Sensitivity:
Maximum Peak Output1:
Low Frequency:
Nominal Impedance
Front Speakers:
Rear Speaker:
Input Power Rating
Front Speakers:
Rear Speaker:
Cabinet Construction:
Input Connectors:
Dimensions (W x H x D):
Net Weight:
Optional Accessories:
23 Hz – 200 Hz
28 Hz – 160 Hz
25 Hz – 80 Hz
5100 W AES, 20400 W Peak
97 dB, 1 W (per driver)
145 dB SPL, 1 m (2π, half-space, ground-based applications)
3 x 21” (547 mm) diameter, 116 mm (4.5 in) Voice Coil, Neodymium magnet
3400 W AES, 13600 W peak
1700 W AES, 6800 W peak
Rectangular enclosure, 16mm Baltic Birch plywood with internal bracing, impact and
weather protected finish, 12 handles, fully integrated stacking runners and runner guides
for both horizontal and vertical stacking
Black powder-coated HEX punched steel grill backed by an acoustically transparent foam
2x Neutrik® Speakon NL-4 wired parallel. 1± Front transducers, 2± Rear transducer
1210 mm x 810 mm x 945 mm (1077 mm with wheels)
155 kg
Removable front lid, Protective cover
Calculated maximum SPL based on rated peak power and sensitivity
3S Ltd., 7 Margrietas, Riga, LV 1046, LATVIA +371 67615752 arturs@3s.lv; www.3s.lv
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