Oberton 6NMB200
Best box: 1.9 L bass reflex tuned to 111.9 Hz · F3 142.9 Hz
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Comparable 6.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Oberton 6NMB200 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 (1.5 L at 139.9 Hz) would need a 32.2 cm port; the recommendation is retuned to 1.9 L at 111.9 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 1.9 Liters |
| Tuning Frequency (Fb) | 111.9 Hz |
| F3 (-3 dB Cutoff) | 142.9 Hz |
| F6 / F10 Extension | 112.3 Hz / 94.2 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 40.9 cm |
| First Pipe Resonance | 421.0 Hz |
| Estimated MOL @ F3 | 112.7 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 0.63 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 264.1 Hz |
| F3 (-3 dB Cutoff) | 248.0 Hz |
| F6 / F10 Extension | 196.7 Hz / 152.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 91.5 Hz |
| Total Q (Qts) | 0.238 |
| Electrical Q (Qes) | 0.244 |
| Mechanical Q (Qms) | 10.18 |
| Equivalent Volume (Vas) | 4.9 Liters |
| Diaphragm Area (Sd) | 139.0 cm² |
| DC Resistance (Re) | 10.6 Ω |
| Efficiency Bandwidth Product (EBP) | 375.4 |
| Linear Excursion (Xmax) | 4.5 mm |
| Thermal Power (Pe) | 200.0 W |
| Nominal Diameter | 6.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Oberton 6NMB200?
Load Forge's calculated alignment puts Oberton 6NMB200 in a 1.9 liter vented enclosure tuned to 111.9 Hz, reaching an F3 cutoff of approximately 142.9 Hz.
Can Oberton 6NMB200 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.63 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 248.0 Hz.
What port dimensions should be used for Oberton 6NMB200 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 6.8 cm with a length of 40.9 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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