MISCO 133-WF04-04
Best box: 6.9 L bass reflex tuned to 43.7 Hz · F3 44.4 Hz
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Comparable 5.25" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the MISCO 133-WF04-04 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 (6.9 L at 41.6 Hz) would need a 45.7 cm port; the recommendation is retuned to 6.9 L at 43.7 Hz so the port can be built.
- Limited linear excursion (Xmax: 3.8 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 6.9 Liters |
| Tuning Frequency (Fb) | 43.7 Hz |
| F3 (-3 dB Cutoff) | 44.4 Hz |
| F6 / F10 Extension | 37.4 Hz / 32.9 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 41.1 cm |
| First Pipe Resonance | 419.0 Hz |
| Estimated MOL @ F3 | 97.8 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 5.9 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 73.9 Hz |
| F3 (-3 dB Cutoff) | 76.2 Hz |
| F6 / F10 Extension | 57.2 Hz / 43.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 56.0 Hz |
| Total Q (Qts) | 0.53 |
| Electrical Q (Qes) | 0.555 |
| Mechanical Q (Qms) | 11.74 |
| Equivalent Volume (Vas) | 4.6 Liters |
| Diaphragm Area (Sd) | 86.6 cm² |
| DC Resistance (Re) | 3.3 Ω |
| Efficiency Bandwidth Product (EBP) | 100.9 |
| Linear Excursion (Xmax) | 3.8 mm |
| Thermal Power (Pe) | 50.0 W |
| Nominal Diameter | 5.25" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for MISCO 133-WF04-04?
Load Forge's calculated alignment puts MISCO 133-WF04-04 in a 6.9 liter vented enclosure tuned to 43.7 Hz, reaching an F3 cutoff of approximately 44.4 Hz.
Can MISCO 133-WF04-04 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 5.9 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 76.2 Hz.
What port dimensions should be used for MISCO 133-WF04-04 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 41.1 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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