LaVoce LAVSAN21450CF
Best box: 80.6 L bass reflex tuned to 56.8 Hz · F3 56.4 Hz
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Comparable 21.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the LaVoce LAVSAN21450CF 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 (80.6 L at 43.7 Hz) would need a 63.8 cm port; the recommendation is retuned to 80.6 L at 56.8 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 80.6 Liters |
| Tuning Frequency (Fb) | 56.8 Hz |
| F3 (-3 dB Cutoff) | 56.4 Hz |
| F6 / F10 Extension | 51.0 Hz / 45.1 Hz |
| Port Inner Diameter | Ø 26.1 cm |
| Port Physical Length | 43.0 cm |
| First Pipe Resonance | 400.0 Hz |
| Estimated MOL @ F3 | 147.1 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 39.3 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 80.6 Hz |
| F3 (-3 dB Cutoff) | 80.5 Hz |
| F6 / F10 Extension | 60.6 Hz / 45.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 32.0 Hz |
| Total Q (Qts) | 0.27 |
| Electrical Q (Qes) | 0.282 |
| Mechanical Q (Qms) | 6.35 |
| Equivalent Volume (Vas) | 230.4 Liters |
| Diaphragm Area (Sd) | 1661.9 cm² |
| DC Resistance (Re) | 3.4 Ω |
| Efficiency Bandwidth Product (EBP) | 113.5 |
| Linear Excursion (Xmax) | 15.5 mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 21.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for LaVoce LAVSAN21450CF?
Load Forge's calculated alignment puts LaVoce LAVSAN21450CF in a 80.6 liter vented enclosure tuned to 56.8 Hz, reaching an F3 cutoff of approximately 56.4 Hz.
Can LaVoce LAVSAN21450CF be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 39.3 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 80.5 Hz.
What port dimensions should be used for LaVoce LAVSAN21450CF to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 26.1 cm with a length of 43.0 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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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