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18-Series 
| JA-6218 | JA-4218 | JA-5218 | JA-6918 | |
| Item | 6.5" 3-Way Impp Cone | 4" 2-Way Impp Cone | 5.25" 2-Way Impp Cone | 6*9" 3-Way Impp Cone |
| Cone | IMPP | IMPP | IMPP | IMPP |
| Surround | Rubber | Rubber | Rubber | Rubber |
| Voice Coil | Asv25.9 (1") | Asv25.9 (1") | Asv25.9 (1") | Asv25.9(1") |
| Impedance | 4 Ohms | 4 Ohms | 4 Ohms | 4 Ohms |
| Magnet | 80*15(11.1oz) | 70*12(6.4oz) | 70*15(8oz) | 100*20(22oz) |
| Woofer Size | 165mm | 102mm | 129*129mm | 235*163mm |
| Mid-Range | 69mm Mylar | |||
| Tweeter | 45mm Mylar | 45mm Mylar | 45mm Mylar | 45mm Mylar |
| Frequency Response (+/- 3dB) | 50-20,000Hz | 60-20,000Hz | 60-20,000Hz | 45-20,000Hz |
| Sensitivity (2.83v/1m) | 87dB ± 3 dB | 84dB ± 3 dB | 85dB ± 3 dB | 88dB ± 3 dB |
| Max power | 75w | 45w | 50w | 90w |
