Speaker item: 21NDS125U1 21"SUBWOOFERNEODYMIUMMAGNETALUMINIUMBASKETDRIVER-5INCHCOPPERVOICECOIL-96.9dB/SPLSENSITIVITY-3600WATTPROGRAMPOWERHANDING-FEMOPTIMIZEDMOTORANDSUSPENSIONS-46mmPEAKTOPEAKMAXIMUMEXCURSION-OPTIMIZEDCOOLINGSYSTEM-ALUMINIUMDEMODULATINGRING.DOUBLESPIDER-RESONANCEFREEANDHEAVYDUTYBASKETDESIGN-TRIPLEROLLSURROUND GENERALSPECIFICATIONSNominaldiametermm(in.)548(21)NominalimpedanceΩ8MinimumimpedanceΩ7.6Programpower(1)W3600AESPowerrating(2)W1800Sensitivity(3)dB96.9FrequencyrangeHz30~1000Voicecoildiametermm(in.)125(5)ChassismaterialAluminiumMagnetmaterialNeodymiumMagnetdimensions(ODxIDxh)mm115x45x16CoilmaterialSVFormermaterialGlassFiberXmax(4)mm14.5Xmech(5)mm23Gapheightmm14VoicecoilWingdingheightmm36
SMALLSIGNALPARAMETERSDCresistanceReOhm6ResonancefrequencyFsHz30MovingmassMmsg319ComplianceCmsmm/N0.09ForcefactorBLN/A28.90MechanicalQ-factorQms11ElectricalQ-factorQes0.42TotalQ-factorQts0.4EquivalentairvolumeVasI420VoicecoilInductanceLemH3.20DiaphragmareaSdcm²1750ReferenceefficiencyEta0%2.9 SHIPPINGINFORMATIONNetweightKg14Multipacksize(1)(WxDxH)mm570x570x280MultipackweightKg16.5