SB Acoustics SB12PAC25-4 4" Aluminum Cone Woofer
SB12PAC25-4 PDF specification sheet link
- Vented reinforced plastic chassis
- Anodised aluminium cone
- Low damping rubber surround
- Large vented motor system
- Long stroke linear suspension
- Light weight CCAW voice coil
- Non-conducting fibreglass coil former
- Non-resonant long life lead wires
A sealed box of 0.05 to 0.1 cubic feet should give you a 3dB down point of about 140Hz.
A vented box of 0.1 cubic feet with a 1" diameter vent by 4" long will give you an F3 of about 70Hz.
A vented box of 0.2 cubic feet with a 1.5" diameter vent by 4.25" long will give you an F3 of about 59Hz
1 cubic foot equals 28.3 liters