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18A-Series 
| JA-6218A | JA-4218A | JA-5218A | JA-6918A | |
| Item | 6.5" 2-Way Rubber-edge Electronic-pated IMPP Cone | 4" 2-Way Rubber-edge Electronic-pated IMPP Cone | 5.25" 2-Way Rubber-edge Electronic-pated IMPP Cone | 6*9" 4-Way Rubber-edge Electronic-pated IMPP Cone |
| Cone | Electronic-pated IMPP | Electronic-pated IMPP | Electronic-pated IMPP | Electronic-pated 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) | 80*12(8.8oz) | 100*18(20oz) |
| Tweeter | Mylar | Mylar | Mylar | Mylar |
| Frequency Response (+/- 3dB) | 60-20,000Hz | 80-20,000Hz | 70-20,000Hz | 50-20,000Hz |
| Sensitivity (2.83v/1m) | 88dB ± 3 dB | 85dB ± 3 dB | 86dB ± 3 dB | 89dB ± 3 dB |
| Max power | 140W | 100W | 120W | 180W |
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