Kartesian Sub250_vHE
Best box: 30.4 L bass reflex tuned to 39.0 Hz · F3 38.1 Hz
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Comparable 10.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Kartesian Sub250_vHE 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 (30.4 L at 31.2 Hz) would need a 72.4 cm port; the recommendation is retuned to 30.4 L at 39.0 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 30.4 Liters |
| Tuning Frequency (Fb) | 39.0 Hz |
| F3 (-3 dB Cutoff) | 38.1 Hz |
| F6 / F10 Extension | 34.4 Hz / 30.5 Hz |
| Port Inner Diameter | Ø 10.0 cm |
| Port Physical Length | 43.8 cm |
| First Pipe Resonance | 393.0 Hz |
| Estimated MOL @ F3 | 123.7 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 13.9 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 58.1 Hz |
| F3 (-3 dB Cutoff) | 59.8 Hz |
| F6 / F10 Extension | 44.7 Hz / 33.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 26.0 Hz |
| Total Q (Qts) | 0.312 |
| Electrical Q (Qes) | 0.328 |
| Mechanical Q (Qms) | 6.4 |
| Equivalent Volume (Vas) | 57.3 Liters |
| Diaphragm Area (Sd) | 338.0 cm² |
| DC Resistance (Re) | 4.2 Ω |
| Efficiency Bandwidth Product (EBP) | 79.4 |
| Linear Excursion (Xmax) | 12.0 mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 10.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Kartesian Sub250_vHE?
Load Forge's calculated alignment puts Kartesian Sub250_vHE in a 30.4 liter vented enclosure tuned to 39.0 Hz, reaching an F3 cutoff of approximately 38.1 Hz.
Can Kartesian Sub250_vHE be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 13.9 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 59.8 Hz.
What port dimensions should be used for Kartesian Sub250_vHE to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 10.0 cm with a length of 43.8 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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