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There is a range from 12" to 18", the details is as below:
| Model Name | SY1220 | SY1820 | SY1520 | ||
| Power RMS | 450W | 800W | 450W | ||
| Power MAX | 900W | 1600W | 900W | ||
| Frequency | 35Hz-3KHz | 35Hz-3KHz | 35Hz-3KHz | ||
| Sensitivity | 97dB | 98dB | 97dB | ||
| Voice coil | 75mm,3" KSV | 100mm,4" KSV | 75mm,3" KSV | ||
| Magnet | 220*110*20 (100oz) Y30 | 220*110*20 (100oz) Y30 | 220*110*20 (100oz) Y30 | ||
| T-yoke | one pc | one pc | one pc | ||
| Washer | 8mm | 10mm | 8mm | ||
| Impedance | 8ohm | 8ohm | 8ohm | ||
| Net Weight | 6.5kgs | 8.5kgs | 7.5kgs | ||
| Gross Weight | 8.0kgs | 10.0kgs | 9.0kgs | ||
| Dimension | 330*330*135mm | 480*480*180mm | 408*408*155mm | ||
12" AL PA SPEAKER