Celestion TSQ2145 21" Neodymium LF Sub woofer Speaker 1,800 Watts RMS 8-ohm

21-inch cast aluminium chassis neodymium magnet low frequency loudspeaker Product Features / Specifications Power rating: Tested for two hours using a continuous, band-limited pink noise signal as per AES standard. Power calculated on minimum impedance. Loudspeaker tested in free air.Continuous power rating: Defined as 3dB greater than the AES rating.Sensitivity: Measured on axis at 1W, 1m in 2π anechoic environment.Parameters: Measured after unit subjected to pre-conditioning signal.Xmax: 0.5*(Hvc-Hg) + 0.25*HgXmech: Maximum peak-to-peak excursion before damage. Advanced temperature control using 3-channel tuned venting system provides highly efficient cooling across the frequency bandVoice coil typically operates at 30°C lower temperature than other leading drivers in this classPolysiloxane laminated triple suspension provides much greater stability and improved cone displacement symmetryLead-out wires precision woven into suspension minimizes excess motion and reduces fatigueDouble-