3400 W continuous program power capacity 116 mm (4.5 in) four layer aluminum voice coil 30 - 500 Hz response 98 dB sensitivity Double silicone spider with optimized compliance Ventilated voice coil gap for reduced power compression Aluminium demodulating ring for very low distortion This next evolution subwoofer uses a new, longer, four layer aluminum voice coil. The result is more energy in the gap, less heat, higher sensitivity, higher power handling, lower distortion and better overall performance. The 18DS115 features a 40mm long, 4.5 inch diameter (116mm) Copper Clad Aluminum W ire voice coil. W ith a 1700watt AES power rating, 98 dB sensitivity, and over 14.0mm of Xvar, this high energy subwoofer is a significant step forward from similar models in the B&C range.