SB34NRXL75-8- Hard paper cone for improved piston operation (made in-house) - Large motor system with under-cut pole piece and dual shorting rings - Vented pole piece for minimum compression - Vented cast aluminium chassis for optimum strength and low compression - 3?copper voice coil for improved power handling - Long life silver lead wires - Low damping rubber surround for improved dynamic linearity - Non-conducting fibre glass voice coil former for minimum damping - Optimized for vented enclosure