The AudioCenter S3218A is a dual-18-inch active DSP-controlled compact subwoofer for high-output professional PA, DJ, live-performance, worship, event, rental, and fixed-installation systems. Two customized 18-inch drivers with 4-inch voice coils operate in a CNC-machined plywood enclosure powered by an integrated Class-D amplifier.
AudioCenter publishes a 26 Hz–135 Hz frequency response, calculated output of 134 dB continuous and 140 dB peak, and selectable 80 Hz, 100 Hz, and 120 Hz low-pass presets. A phase switch and XLR input/output support integration with different full-range loudspeakers and linked active systems.
Acoustic Specifications
| Model |
S3218A |
| Product type |
Active DSP-controlled compact subwoofer |
| Frequency response |
26 Hz–135 Hz (-10 dB) |
| Maximum calculated SPL |
134 dB continuous / 140 dB peak at 1 meter |
| Low-frequency drivers |
Two customized 18-inch drivers with 4-inch voice coils |
| DSP sampling rate |
48 kHz |
| Low-pass presets |
80 Hz, 100 Hz, and 120 Hz |
| Phase control |
Rear-panel phase switch |
Amplifier and Connections
| Amplifier circuitry |
Class D |
| RMS power |
2,000 watts |
| Peak power |
4,000 watts |
| Amplifier frequency response |
20 Hz–20 kHz, ±0.5 dB |
| Intermodulation distortion |
Less than 0.05% |
| Total harmonic distortion |
Less than 0.05% |
| Cooling |
Fan cooling with air convection |
| Protection |
DC, short-circuit, thermal, input-overload, output-overload, soft-start, overvoltage, and undervoltage protection |
| Signal input |
Female XLR |
| Signal output |
Male XLR |
| Power input |
Locking power connector |
| Working voltage |
100–130 or 220–240 volts AC, 50/60 Hz |
| Power consumption |
237 watts at 1/8 output power |
Cabinet and Physical Specifications
| Cabinet material |
CNC-machined plywood |
| Grille |
Iron mesh |
| Handles |
Four side handles |
| Pole mount |
M20 base for 35 mm pole |
| Dimensions |
1,206 × 565 × 694 mm |
| Net weight |
68 kg |
