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*Hg
Xmech: Maximum peak-to-peak excursion before damage.
Advanced temperature control using 3-channel tuned venting system provides highly efficient cooling across the frequency band
Voice coil typically operates at 30°C lower temperature than other leading drivers in this class
Polysiloxane laminated triple suspension provides much greater stability and improved cone displacement symmetry
Lead-out wires precision woven into suspension minimizes excess motion and reduces fatigue
Double-sided, weatherproof cone coating enhances durability
Nominal diameter : 530mm / 21in
Power rating : 1800W RMS
Continuous power rating : 3600W
Rated impedance : 8Ω
Sensitivity : 97dB
Frequency range : 30-1,000Hz
Chassis type : Cast aluminum
Magnet type : Neodymium
Voice coil diameter : 115mm / 4.5in
Voice coil material : Round copper
Former material : Glass fibre
Cone material : Glass loaded cellulose, water-resistant coating front & back
Surround material : Triple roll, cloth sealed
Suspension : Triple, polysiloxane-laminated
Gap height(Hg) : 12mm / 0.46in
VC winding height(Hvc) : 36mm / 1.42in
Parameters
Sd : 1661.9cm2 / 257.9in2
Fs : 30Hz
Mms : 435.2g / 15.35oz
Qms : 8.393
Qes : 0.359
Qts : 0.344
Re : 5.0Ω
Vas : 253.8l / 8.96ft3
BI : 33.8Tm
Cms : 0.065mm/N
Rms : 9.77kg/s
Le(at 1kHz) : 3.91mH
Xmax : 15mm / 0.46in
Xmech : 40mm / 1.57in
Efficiency η : 01.9%
Mounting Information
Overall diameter : 541mm / 21.3in
Overall depth : 250mm / 9.84in
Cut-out diameter : 505mm / 19.88in
Mounting hole dimensions : 8.5x10mm / 0.33x0.39in
Number of mounting holes : 8
Mounting hole PCD : 525-528mm / 20.61-20.79in
Flange & gasket thickness : 17mm / 0.67in