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37A-Series 
| JA-6237A | JA-4237A | JA-5237A | JA-6937A | |
6.5"2-way rubber-edge CURV cone | 4"2-way rubber-edge CURV cone | 5.25"2-way rubber-edge CURV cone | 6*9"3-way rubber-edge CURV cone | |
| Voice coil | ASV25.9(1") | ASV25.9(1") | ASV25.9(1") | ASV30.5(1.2") |
| Impedance | 4 Ohm | 4 Ohm | 4 Ohm | 4 Ohm |
| Magnet | 80X12(8.8oz) | 70X12(6.4oz) | 70X15(8oz) | 100X15(17oz) |
| Sensitivity | 88dB ±3dB | 86dB ±3dB | 87dB ±3dB | 89dB ±3dB |
| Max power | 120W | 80W | 100W | 160W |
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