1.8 Inch car subwoofer with Iron frame, 2.dual 4ohm, 3.300W, 600W(Max) VW08-020R8 Inch car ... subwoofer with Iron frame, dual 4ohm, 300W, 600W(Max)SPEAKER SPECIFICATIONS NOITEM SPECIFICATIONS 1DIAMETER 8inch2VOICE COIL IMPEDANCE ... ,9 after test.13HEAT TEST55±2°C for 8+Room ambient condition for 1h.The speaker must ... test.15FRAME 16VOICE COIL Φ50Voice Coil 17EDGEPP 600W 8 Inch car subwoofer