Volcano Series
| Model | SVL-1847 D1 / SVL-1847 D2 | 
| Type | Subwoofer | 
| Size | 18 inch | 
| Voice coil size | 4.00 inch | 
| Cone | Paper | 
| Magnet | Ferrite | 
| Voice coil wire | CCAW | 
| Surround | Foam | 
| RMS Power | 3800 W | 
| MAX Power | 7600 W | 
| Frame | Alu | 
| Impedance | 1+1 / 2+2 Ohm | 
| SPL | 88.50 / 88.50 dB | 
| Fs | 33.00 / 33.00 Hz | 
| Qts | 0.33 / 0.33 | 
| BL | 27.30 / 27.30 | 
| Vas | 178.00 / 177.00 L | 
| Xmeh | 66.00 / 66.00 mm | 
| Xmax | 33.00 / 33.00 mm | 
| Mounting depth | 12.26 inch (311.5 mm) | 
| Cut-out dimension | 16.81 inch (426.9 mm) |