FaitalPRO 21XL3000-8P
Best box: 79.9 L bass reflex tuned to 43.9 Hz · F3 49.7 Hz
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Comparable 21.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the FaitalPRO 21XL3000-8P 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
- Port length (78.4 cm) exceeds a straight internal run; use an elbow bend, slotted vent or 3D folded duct to fit the enclosure.
Recommended Bass Reflex (Vented)
PORT NEEDS ELBOW / 3D| Net Box Volume (Vb) | 79.9 Liters |
| Tuning Frequency (Fb) | 43.9 Hz |
| F3 (-3 dB Cutoff) | 49.7 Hz |
| F6 / F10 Extension | 42.4 Hz / 36.3 Hz |
| Port Inner Diameter | Ø 25.1 cm |
| Port Physical Length | 78.4 cm |
| First Pipe Resonance | 219.0 Hz |
| Estimated MOL @ F3 | 127.6 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 40.7 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 81.3 Hz |
| F3 (-3 dB Cutoff) | 83.6 Hz |
| F6 / F10 Extension | 62.7 Hz / 47.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 30.0 Hz |
| Total Q (Qts) | 0.25 |
| Electrical Q (Qes) | 0.257 |
| Mechanical Q (Qms) | 8.8 |
| Equivalent Volume (Vas) | 284.6 Liters |
| Diaphragm Area (Sd) | 1744.0 cm² |
| DC Resistance (Re) | 5.9 Ω |
| Efficiency Bandwidth Product (EBP) | 116.6 |
| Linear Excursion (Xmax) | 17.7 mm |
| Thermal Power (Pe) | 3000.0 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 FaitalPRO 21XL3000-8P?
Load Forge's calculated alignment puts FaitalPRO 21XL3000-8P in a 79.9 liter vented enclosure tuned to 43.9 Hz, reaching an F3 cutoff of approximately 49.7 Hz.
Can FaitalPRO 21XL3000-8P be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 40.7 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 83.6 Hz.
What port dimensions should be used for FaitalPRO 21XL3000-8P to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 25.1 cm with a length of 78.4 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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