| Model | PD21500C |
| Nominal Basket Diameter | 568×550 mm (21 in) |
| No Voice Coil Diameter | 125 mm |
| Nominal Impedance | 8Ω |
| Sensitivity | 98 dB |
| Usable Frequency Range | 31Hz-2.0KHz |
| Rated Power | 1200 W |
| MAX Power | 2400 W |
| Resonant Frequency (fs) | 31 Hz |
| DC Resistance (Re) | 5.8Ω |
| Mechanical Q (Qms) | 10.42 |
| Electromagnetic Q (Qes) | 0.30 |
| Total Q (Qts) | 0.29 |
| Efficiency | 4.08% |
| Installation Dimensions | |
| (Overall Diameter) | 568×550 mm |
| (Mounting Holes B.C.D) | 552 mm |
| (Baffle Hole Diameter) | 496 mm |
| (The full height) | 230 mm |
| (Edge thickness) | 18 mm |
| (Net Weight) | Kg |
