Supravox 400-2000
Best box: 76.8 L sealed · Fc 55.4 Hz · F3 62.2 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Supravox 400-2000 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
- Straight vent would be 369.7 cm long: not physically buildable as a simple tube. Use a passive radiator, a folded slot port or model a 3D folded duct in Load Forge Studio.
- Large enclosure volume (157.5 L) requires extensive internal matrix bracing to prevent panel resonance.
Textbook Bass Reflex — not recommended
PORT NOT BUILDABLE| Net Box Volume (Vb) | 157.5 Liters |
| Tuning Frequency (Fb) | 31.4 Hz |
| F3 (-3 dB Cutoff) | 42.0 Hz |
| F6 / F10 Extension | 34.1 Hz / 27.8 Hz |
| Port Inner Diameter | Ø 51.8 cm |
| Port Physical Length | 369.7 cm |
| First Pipe Resonance | 47.0 Hz |
| Estimated MOL @ F3 | 148.5 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 76.8 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 55.4 Hz |
| F3 (-3 dB Cutoff) | 62.2 Hz |
| F6 / F10 Extension | 49.7 Hz / 38.8 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 23.0 Hz |
| Total Q (Qts) | 0.27 |
| Electrical Q (Qes) | 0.313 |
| Mechanical Q (Qms) | 1.98 |
| Equivalent Volume (Vas) | 450.0 Liters |
| Diaphragm Area (Sd) | 855.0 cm² |
| DC Resistance (Re) | 6.5 Ω |
| Efficiency Bandwidth Product (EBP) | 73.5 |
| Linear Excursion (Xmax) | 215.0 mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 15.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Supravox 400-2000?
A simple ported box is not recommended for Supravox 400-2000: the textbook alignment (157.5 liters tuned to 31.4 Hz) needs a 369.7 cm port, and no nearby retune stays buildable without a bass hump. A sealed box, a passive radiator or a folded duct is the practical choice.
Can Supravox 400-2000 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 76.8 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 62.2 Hz.
What port dimensions should be used for Supravox 400-2000 to avoid port chuffing?
A straight 51.8 cm port would need 369.7 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.
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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