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51A-Series 
| JA-6251A | JA-4251A | JA-5251A | JA-6951A | |
| 6.5"2-way rubber edge Glass fiber composited cone | 4"2-way rubber edge Glass fiber composited cone | 5.25"2-way rubber edge Glass fiber composited cone | 6*9"3-way rubber edge Glass fiber composited cone | |
| Voice coil | KSV25.9 (1") | KSV25.9 (1") | KSV25.9 (1") | KSV30.5 (1.2") |
| Impedance | 4 Ohm | 4 Ohm | 4 Ohm | 4 Ohm |
| Magnet | 80*15(11oz) | 70*12(6.4oz) | 70*15(8oz) | 100*18(20oz) |
| Sensitivity | 89dB ±3dB | 87dB ±3dB | 88dB ±3dB | 90dB ±3dB |
| Max power | 140W | 80W | 120W | 280W |
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