Aluminum shorting sleeve, ring, and pole cap ensure linear inductance and ultra-low distortion. Rigid anodized aluminum cone with indexed edge for pistonic accuracy and reduced resonance. 2.5" 4-layer copper voice coil on a vented aluminum former for superior power handling and cooling. Massive triple-stacked magnet assembly delivers exceptional strength and symmetry at high excursion. Dual spider suspension with stitched tinsel leads for precise pistonic motion and enhanced durability