-
87-Series 
| JA-6287 | JA-4287 | JA-5287 | JA-6918 | |
| Item | 6.5" 2-Way Paper Cone | 4" 2-Way Paper Cone | 5.25" 2-Way Paper Cone | 6*9" 4-Way Paper Cone |
| Cone | Paper | Paper | Paper | Paper |
| Surround | Rubber | Rubber | Rubber | Rubber |
| Voice Coil | Asv25.9 (1") | Asv19.45 (0.76") | Asv19.45 (0.76") | 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*15(17oz) |
| Woofer Size | 165mm | 102mm | 129*129mm | 235*163mm |
| Mid-Range | 63mm Mylar | |||
| Tweeter | 50mm Mylar | 38mm Mylar | 38mm Mylar | 20mm Mylar |
| Frequency Response (+/- 3dB) | 50-20,000Hz | 60-20,000Hz | 60-20,000Hz | 45-20,000Hz |
| Sensitivity (2.83v/1m) | 85dB ± 3 dB | 83dB ± 3 dB | 84dB ± 3 dB | 87dB ± 3 dB |
| Max power | 70w | 40w | 45w | 80w |
