Bliesma W137B-8
Best box: 8.0 L bass reflex tuned to 44.5 Hz · F3 46.6 Hz
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Comparable 5.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Bliesma W137B-8 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) | 8.0 Liters |
| Tuning Frequency (Fb) | 44.5 Hz |
| F3 (-3 dB Cutoff) | 46.6 Hz |
| F6 / F10 Extension | 40.4 Hz / 35.1 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 33.6 cm |
| First Pipe Resonance | 512.0 Hz |
| Estimated MOL @ F3 | 102.1 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 3.6 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 82.7 Hz |
| F3 (-3 dB Cutoff) | 83.8 Hz |
| F6 / F10 Extension | 63.3 Hz / 47.8 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 38.0 Hz |
| Total Q (Qts) | 0.32 |
| Electrical Q (Qes) | 0.334 |
| Mechanical Q (Qms) | 7.9 |
| Equivalent Volume (Vas) | 14.0 Liters |
| Diaphragm Area (Sd) | 95.0 cm² |
| DC Resistance (Re) | 7.4 Ω |
| Efficiency Bandwidth Product (EBP) | 113.9 |
| Linear Excursion (Xmax) | 6.5 mm |
| Thermal Power (Pe) | 100.0 W |
| Nominal Diameter | 5.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Bliesma W137B-8?
Load Forge's calculated alignment puts Bliesma W137B-8 in a 8.0 liter vented enclosure tuned to 44.5 Hz, reaching an F3 cutoff of approximately 46.6 Hz.
Can Bliesma W137B-8 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 3.6 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 83.8 Hz.
What port dimensions should be used for Bliesma W137B-8 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 33.6 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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