Oberton 8M250
Best box: 3.4 L bass reflex tuned to 92.7 Hz · F3 145.2 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Oberton 8M250 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 (2.3 L at 132.4 Hz) would need a 22.1 cm port; the recommendation is retuned to 3.4 L at 92.7 Hz so the port can be built.
- Limited linear excursion (Xmax: 2.75 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 3.4 Liters |
| Tuning Frequency (Fb) | 92.7 Hz |
| F3 (-3 dB Cutoff) | 145.2 Hz |
| F6 / F10 Extension | 105.6 Hz / 84.8 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 16.6 cm |
| First Pipe Resonance | 1038.0 Hz |
| Estimated MOL @ F3 | 115.3 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 1.4 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 250.7 Hz |
| F3 (-3 dB Cutoff) | 211.2 Hz |
| F6 / F10 Extension | 167.6 Hz / 128.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 74.4 Hz |
| Total Q (Qts) | 0.201 |
| Electrical Q (Qes) | 0.204 |
| Mechanical Q (Qms) | 14.01 |
| Equivalent Volume (Vas) | 15.6 Liters |
| Diaphragm Area (Sd) | 202.0 cm² |
| DC Resistance (Re) | 5.0 Ω |
| Efficiency Bandwidth Product (EBP) | 364.7 |
| Linear Excursion (Xmax) | 2.8 mm |
| Thermal Power (Pe) | 250.0 W |
| Nominal Diameter | 8.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Oberton 8M250?
Load Forge's calculated alignment puts Oberton 8M250 in a 3.4 liter vented enclosure tuned to 92.7 Hz, reaching an F3 cutoff of approximately 145.2 Hz.
Can Oberton 8M250 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 1.4 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 211.2 Hz.
What port dimensions should be used for Oberton 8M250 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 16.6 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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