BMS 15N820
Best box: 49.9 L bass reflex tuned to 55.3 Hz · F3 59.9 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the BMS 15N820 does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 49.9 Liters |
| Tuning Frequency (Fb) | 55.3 Hz |
| F3 (-3 dB Cutoff) | 59.9 Hz |
| F6 / F10 Extension | 51.9 Hz / 44.8 Hz |
| Port Inner Diameter | Ø 12.5 cm |
| Port Physical Length | 15.2 cm |
| First Pipe Resonance | 1134.0 Hz |
| Estimated MOL @ F3 | 128.8 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 24.9 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 100.9 Hz |
| F3 (-3 dB Cutoff) | 99.7 Hz |
| F6 / F10 Extension | 75.6 Hz / 57.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 39.2 Hz |
| Total Q (Qts) | 0.26 |
| Electrical Q (Qes) | 0.276 |
| Mechanical Q (Qms) | 4.5 |
| Equivalent Volume (Vas) | 159.0 Liters |
| Diaphragm Area (Sd) | 880.0 cm² |
| DC Resistance (Re) | 5.7 Ω |
| Efficiency Bandwidth Product (EBP) | 142.1 |
| Linear Excursion (Xmax) | 4.5 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 BMS 15N820?
Load Forge's calculated alignment puts BMS 15N820 in a 49.9 liter vented enclosure tuned to 55.3 Hz, reaching an F3 cutoff of approximately 59.9 Hz.
Can BMS 15N820 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 24.9 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 99.7 Hz.
What port dimensions should be used for BMS 15N820 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 12.5 cm with a length of 15.2 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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