LaVoce SAF184.50-4
Best box: 104.4 L bass reflex tuned to 39.8 Hz · F3 38.3 Hz
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Comparable 18.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the LaVoce SAF184.50-4 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 (104.4 L at 37.9 Hz) would need a 48.5 cm port; the recommendation is retuned to 104.4 L at 39.8 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 104.4 Liters |
| Tuning Frequency (Fb) | 39.8 Hz |
| F3 (-3 dB Cutoff) | 38.3 Hz |
| F6 / F10 Extension | 34.3 Hz / 30.3 Hz |
| Port Inner Diameter | Ø 20.0 cm |
| Port Physical Length | 42.6 cm |
| First Pipe Resonance | 403.0 Hz |
| Estimated MOL @ F3 | 123.0 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 45.7 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 68.4 Hz |
| F3 (-3 dB Cutoff) | 69.8 Hz |
| F6 / F10 Extension | 52.5 Hz / 39.5 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 36.0 Hz |
| Total Q (Qts) | 0.36 |
| Electrical Q (Qes) | 0.389 |
| Mechanical Q (Qms) | 4.76 |
| Equivalent Volume (Vas) | 130.6 Liters |
| Diaphragm Area (Sd) | 1220.0 cm² |
| DC Resistance (Re) | 3.6 Ω |
| Efficiency Bandwidth Product (EBP) | 92.4 |
| Linear Excursion (Xmax) | 12.5 mm |
| Thermal Power (Pe) | 1800.0 W |
| Nominal Diameter | 18.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for LaVoce SAF184.50-4?
Load Forge's calculated alignment puts LaVoce SAF184.50-4 in a 104.4 liter vented enclosure tuned to 39.8 Hz, reaching an F3 cutoff of approximately 38.3 Hz.
Can LaVoce SAF184.50-4 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 45.7 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 69.8 Hz.
What port dimensions should be used for LaVoce SAF184.50-4 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 20.0 cm with a length of 42.6 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
Embed this design card on DIYAudio, AVSForum, Reddit, or Facebook. It shows the calculated F3, MOL (when the power rating is published) and box parameters.
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