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SB Acoustics SB42FHCL75-6 15" Fiberglass Cone Woofer
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SB Acoustics SB42FHCL75 15" Woofer
PDF spec sheet for download
SB42 x2 + C173N-T6-90 + T500AMKii 3way Passive Crossover Design
- Light weight rigid honeycomb cone (hard paper honeycomb with fiber glass skin layers)
- 3 copper voice coil for improved power handling
- Long life silver lead wires
- Vented pole piece for minimum compression
- Vented cast aluminum chassis for optimum strength and low compression
- Low damping rubber surround for improved dynamic linearity
- Non-conducting fiber glass voice coil former for minimum damping
- Large motor system
Large cone drivers often experience problems with the cone material changing shape while being driven. There is always a compromise between a rigidity and lightness of the cone. SB Acoustics has solved this problem by using a rigid honeycomb structure made from paper and then covering it with a thin membrane of fiberglass. The result is a very rigid and light cone with minimized cone distortion.
The voice coil is ventilated below the spider and through the pole piece. This increases power handling and reduces mechanical noise. The cast frame has been engineered for minimum reflections and maximum air flow. 
Box suggestions:
Sealed box of 3.0 cubic feet with stuffing has and F3 of 45Hz and F6 of 34Hz
Vented box of 5.0 cubic feet with stuffing and 4" diameter vent by 7" long has an F3 of 32Hz.
