SB Acoustics SB16PFC25-4-COAX Coaxial Woofer
Best box: 0.26 L sealed · Fc 82.0 Hz · F3 83.2 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SB Acoustics SB16PFC25-4-COAX Coaxial Woofer does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
⚠️ Engineering Notice for Builders
- Straight vent would be 204.7 cm long: not physically buildable as a simple tube. Use a passive radiator, a folded slot port or model a 3D folded duct in Load Forge Studio.
Textbook Bass Reflex — not recommended
PORT NOT BUILDABLE| Net Box Volume (Vb) | 1.5 Liters |
| Tuning Frequency (Fb) | 43.4 Hz |
| F3 (-3 dB Cutoff) | 40.3 Hz |
| F6 / F10 Extension | 37.5 Hz / 34.1 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 204.7 cm |
| First Pipe Resonance | 84.0 Hz |
| Estimated MOL @ F3 | 88.7 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 0.26 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 82.0 Hz |
| F3 (-3 dB Cutoff) | 83.2 Hz |
| F6 / F10 Extension | 62.8 Hz / 47.4 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 36.0 Hz |
| Total Q (Qts) | 0.31 |
| Electrical Q (Qes) | 0.352 |
| Mechanical Q (Qms) | 2.6 |
| Equivalent Volume (Vas) | 1.1 Liters |
| Diaphragm Area (Sd) | 220.0 cm² |
| DC Resistance (Re) | 3.2 Ω |
| Efficiency Bandwidth Product (EBP) | 102.3 |
| Linear Excursion (Xmax) | 4.7 mm |
| Thermal Power (Pe) | 40.0 W |
| Nominal Diameter | 8.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for SB Acoustics SB16PFC25-4-COAX Coaxial Woofer?
A simple ported box is not recommended for SB Acoustics SB16PFC25-4-COAX Coaxial Woofer: the textbook alignment (1.5 liters tuned to 43.4 Hz) needs a 204.7 cm port, and no nearby retune stays buildable without a bass hump. A sealed box, a passive radiator or a folded duct is the practical choice.
Can SB Acoustics SB16PFC25-4-COAX Coaxial Woofer be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.26 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 83.2 Hz.
What port dimensions should be used for SB Acoustics SB16PFC25-4-COAX Coaxial Woofer to avoid port chuffing?
A straight 5.0 cm port would need 204.7 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.
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