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There is a range from 15" to 21", the details is as below:
| Model Name | SY1812 | SY2112 | SY1512 | ||
| Power RMS | 800W | 1200W | 450W | ||
| Power MAX | 1600W | 2400W | 900W | ||
| Frequency | 35Hz-3KHz | 40-3KHz | 35Hz-3KHz | ||
| Sensitivity | 97dB | 98dB | 97dB | ||
| Voice coil | 100mm,4" | 127mm,5" | 75mm,3" | ||
| Magnet | 220*110*20 (100oz) Y30 | 170oz | 200*86*20 (90oz) Y30 | ||
| T-yoke | one pc | one pc | one pc | ||
| Washer | 10mm | 8mm | |||
| Impedance | 8ohm | 8ohm | 80ohm | ||
| Net Weight | 12.0kgs | 17.5kgs | 9.0kgs | ||
| Gross Weight | 13.5kgs | 19.0kgs | 10.5kgs | ||
| Dimension | 483*483*210mm | 560*560*255mm | 408*408*167mm | ||
18" PA LOUDSPEAKER