SB Acoustics SB12NRX25-08 4" woofer- 8 ohms

SB Acoustics 4" SB12NRX25-08 "Norex" Natural Paper Cone Woofer- 123mm- 8 ohm

Spec Sheet PDF

Great for tiny ported box, see below. Consider two in parallel to get the output up. Rubber surround. 8 ohm.

• Proprietary cone material with natural fibres made in-house
• High damping Butyl rubber surround for non-resonant sound character
• Vented pole piece for reduced compression
• Vented cast aluminium chassis for optimum strength and low compression
• CCAW voice coil for reduced moving mass
• Long life silver lead wires
• Non-conducting fibre glass coil former for minimum damping

Suggested box alignment:

0.2 cf3 (5.7 liters) with a single 1" x 3.25" vent for Fb of about 50Hz; F3 about 55Hz.