Dual 21 inch Direct-Radiating Subwoofer

Ultra-compact, direct-radiating subwoofer that is designed to provide gut churning impact and solid musicality – not just infrasonic effects. Paralleling its two 8 ohm woofers provides a 4 ohm load. Up to two US221-4 may thus be powered by a single channel of a high power amplifier.

Operating Mode: Single- or dual-amplified w/ DSP
Operating Range: 28 Hz to 188 Hz
LF Transducers: 2x 21.0′′ woofers, 6.0′′ voice coil; neodymium magnet Power Handling @ Nominal Impedance: 4000 W @ 4 Ω
Equalized Maximum SPL (peak / continuous): 143 dB / 137 dB (half space)
Dimensions (H x W x D): 568 x 891 x 762 mm / 22.4 x 35.1 x 30.0 in Weight: 80.3 kg / 177.0 lb

Spec SheetProcessor Settings

Prod Photo, US221 Horz Timo Beckman Geluidstechniek 2013