SB Acoustics SB20PFCR30-4 8" Paper Cone Woofer- 4 ohm

SB Acoustics SB20PFCR30-4 8" Woofer Paper Cone- 218mm- 4 ohm- ROUND

Spec Sheet PDF

Low Q, good for medium size vented box (see below)

This 8" papyrus fiber paper cone woofer is a great value for this build quality and performance.  The specifications make it a good choice for many different enclosure types.  An extended and smooth frequency response suggests simple crossovers, even none at all. 

• Vented reinforced plastic chassis
• Proprietary cone material with natural fibers made in-house
• Soft low damping rubber surround for improved transient response
• Large spider for improved linearity
• Optimized motor system
• Vented coil former for low compression
• Non-resonant long life lead wires

Some possible box alignments:

Sealed box of 0.5 to 0.75 cubic foot for a 3dB down of about 70Hz
Vented box of 0.75 cubic foot with 2" Ø vent by 5" long for f3 of 55Hz
Vented box of 1.0 cubic foot with 2" Ø vent by 4" long for f3 of 49Hz
Vented box of 1.25 cubic feet with 2" Ø vent by 3.5" long for f3 of 45Hz
Vented box of 1.5 cubic feet with 2" Ø vent by 3" long for f3 of 42Hz