SB Acoustics 5″ SB13PFCR25-4-COAX
Best box: 5.0 L bass reflex tuned to 58.7 Hz · F3 64.4 Hz
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Comparable 5.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SB Acoustics 5″ SB13PFCR25-4-COAX does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 5.0 Liters |
| Tuning Frequency (Fb) | 58.7 Hz |
| F3 (-3 dB Cutoff) | 64.4 Hz |
| F6 / F10 Extension | 55.4 Hz / 47.6 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 30.6 cm |
| First Pipe Resonance | 562.0 Hz |
| Estimated MOL @ F3 | 99.9 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 2.5 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 110.3 Hz |
| F3 (-3 dB Cutoff) | 107.7 Hz |
| F6 / F10 Extension | 81.9 Hz / 61.8 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 43.0 Hz |
| Total Q (Qts) | 0.27 |
| Electrical Q (Qes) | 0.307 |
| Mechanical Q (Qms) | 2.26 |
| Equivalent Volume (Vas) | 14.4 Liters |
| Diaphragm Area (Sd) | 82.0 cm² |
| DC Resistance (Re) | 3.2 Ω |
| Efficiency Bandwidth Product (EBP) | 140.2 |
| Linear Excursion (Xmax) | 4.7 mm |
| Thermal Power (Pe) | 40.0 W |
| Nominal Diameter | 5.0" |
| 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 5″ SB13PFCR25-4-COAX?
Load Forge's calculated alignment puts SB Acoustics 5″ SB13PFCR25-4-COAX in a 5.0 liter vented enclosure tuned to 58.7 Hz, reaching an F3 cutoff of approximately 64.4 Hz.
Can SB Acoustics 5″ SB13PFCR25-4-COAX be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 2.5 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 107.7 Hz.
What port dimensions should be used for SB Acoustics 5″ SB13PFCR25-4-COAX to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 30.6 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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