Tang Band W6-1139SI
Best box: 12.7 L bass reflex tuned to 41.9 Hz · F3 39.4 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Tang Band W6-1139SI 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
- The textbook alignment (12.7 L at 36.4 Hz) would need a 59.8 cm port; the recommendation is retuned to 12.7 L at 41.9 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 12.7 Liters |
| Tuning Frequency (Fb) | 41.9 Hz |
| F3 (-3 dB Cutoff) | 39.4 Hz |
| F6 / F10 Extension | 35.7 Hz / 31.8 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 44.0 cm |
| First Pipe Resonance | 391.0 Hz |
| Estimated MOL @ F3 | 98.4 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 5.5 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 66.5 Hz |
| F3 (-3 dB Cutoff) | 69.4 Hz |
| F6 / F10 Extension | 52.0 Hz / 39.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 38.0 Hz |
| Total Q (Qts) | 0.4 |
| Electrical Q (Qes) | 0.471 |
| Mechanical Q (Qms) | 2.65 |
| Equivalent Volume (Vas) | 11.8 Liters |
| Diaphragm Area (Sd) | 140.0 cm² |
| DC Resistance (Re) | 3.6 Ω |
| Efficiency Bandwidth Product (EBP) | 80.7 |
| Linear Excursion (Xmax) | 13.0 mm |
| Thermal Power (Pe) | 50.0 W |
| Nominal Diameter | 6.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Tang Band W6-1139SI?
Load Forge's calculated alignment puts Tang Band W6-1139SI in a 12.7 liter vented enclosure tuned to 41.9 Hz, reaching an F3 cutoff of approximately 39.4 Hz.
Can Tang Band W6-1139SI be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 5.5 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 69.4 Hz.
What port dimensions should be used for Tang Band W6-1139SI to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 6.8 cm with a length of 44.0 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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