MISCO 133-WF08-02
Best box: 2.3 L bass reflex tuned to 74.0 Hz · F3 101.0 Hz
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Comparable 5.25" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the MISCO 133-WF08-02 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 (2.3 L at 70.5 Hz) would need a 47.9 cm port; the recommendation is retuned to 2.3 L at 74.0 Hz so the port can be built.
- Xmax is not published, so the port size is an empirical estimate (area ≥ 12 in² per ft³ of net volume, minimum by driver size), not a displacement calculation. Check air velocity in Load Forge Studio.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 2.3 Liters |
| Tuning Frequency (Fb) | 74.0 Hz |
| F3 (-3 dB Cutoff) | 101.0 Hz |
| F6 / F10 Extension | 83.4 Hz / 64.3 Hz |
| Port Inner Diameter ESTIMATED | Ø 5.0 cm |
| Port Physical Length | 43.2 cm |
| First Pipe Resonance | 399.0 Hz |
| Estimated MOL @ F3 | 101.3 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.68 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.962; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 2.8 Liters |
| System Q (Qtc) | 0.962 (above Butterworth) |
| System Resonance (Fc) | 117.4 Hz |
| F3 (-3 dB Cutoff) | 100.1 Hz |
| F6 / F10 Extension | 81.9 Hz / 65.2 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 83.0 Hz |
| Total Q (Qts) | 0.68 |
| Electrical Q (Qes) | 0.733 |
| Mechanical Q (Qms) | 9.48 |
| Equivalent Volume (Vas) | 2.8 Liters |
| Diaphragm Area (Sd) | 91.6 cm² |
| DC Resistance (Re) | 6.7 Ω |
| Efficiency Bandwidth Product (EBP) | 113.3 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | 40.0 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-WF08-02?
Load Forge's calculated alignment puts MISCO 133-WF08-02 in a 2.3 liter vented enclosure tuned to 74.0 Hz, reaching an F3 cutoff of approximately 101.0 Hz.
Can MISCO 133-WF08-02 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 2.8 liters with a Qtc of 0.962 (above Butterworth), the system exhibits an F3 of 100.1 Hz.
What port dimensions should be used for MISCO 133-WF08-02 to avoid port chuffing?
Xmax is not published for MISCO 133-WF08-02, so the port is an empirical estimate: a 5.0 cm diameter with a length of 43.2 cm (area at least 12 in² per ft³ of net volume). Check the air velocity at your power level in Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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