The V221-S is a very high-output bass reflex subwoofer. The system is equipped with two advanced 21” RCF precision woofers mounted in a front-loaded configuration. This new high power design marks the latest refinements in RCF experience in compact subwoofer design, resulting in a fast and controlled reproduction of the bass frequency range. The two transducers couple to achieve tight and maximised output, while the subwoofer design ensures an efficient acoustic response down to 25 Hz.FeaturesHigh power, bass reflex subwoofer system2 x 21" high power, 4.5" voice coil hypervented woofers143 dB max SPL4000 Watt AESVery high output, response down to 30 HzBirch plywood cabinetWeather resistant, textured, polyurea finishEpoxy powder coated front grilleAcoustical Specifications Frequency Response -10 dB: 25 Hz ÷ 200 HzMax SPL @ 1m: 143 dBSystem Sensitivity: 100 dBNominal Impedance: 4 Power Handling: 4000 WPeak Power Handling: 16000 WRecommended Amplifier: 8000 W Transducers Woofer: 2 x 21", 4.5" voice coilNominal Impedance: 8 Input Power Rating: 2000 W AES each W AES Input SectionInput connector: 2 x SPEAKON NL4 Cabinet Cabinet Material: 15mm Birch PlywoodHardware: Pole mount readyHandles: 4 sideGrille: Custom perforated steel grilleColour: black Physical Specifications Height: 585 / 29.33 mm/inchWidth: 1500 / 59.05 mm/inchDepth: 870 / 34.25 mm/inchNet Weight: 110 / 242.5 kg/lbs.