Adire Audio Brahma X Mk2 15″
Best box: 161.1 L bass reflex tuned to 23.5 Hz · F3 21.3 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Adire Audio Brahma X Mk2 15″ 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 (161.1 L at 20.4 Hz) would need a 126.2 cm port; the recommendation is retuned to 161.1 L at 23.5 Hz so the port can be built.
- Port length (91.5 cm) exceeds a straight internal run; use an elbow bend, slotted vent or 3D folded duct to fit the enclosure.
- Large enclosure volume (161.1 L) requires extensive internal matrix bracing to prevent panel resonance.
Recommended Bass Reflex (Vented)
PORT NEEDS ELBOW / 3D| Net Box Volume (Vb) | 161.1 Liters |
| Tuning Frequency (Fb) | 23.5 Hz |
| F3 (-3 dB Cutoff) | 21.3 Hz |
| F6 / F10 Extension | 19.4 Hz / 17.3 Hz |
| Port Inner Diameter | Ø 20.0 cm |
| Port Physical Length | 91.5 cm |
| First Pipe Resonance | 188.0 Hz |
| Estimated MOL @ F3 | 116.0 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 85.0 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 36.5 Hz |
| F3 (-3 dB Cutoff) | 37.2 Hz |
| F6 / F10 Extension | 28.0 Hz / 21.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 24.7 Hz |
| Total Q (Qts) | 0.47 |
| Electrical Q (Qes) | 0.519 |
| Mechanical Q (Qms) | 5.0 |
| Equivalent Volume (Vas) | 107.4 Liters |
| Diaphragm Area (Sd) | 791.7 cm² |
| DC Resistance (Re) | 3.84 Ω |
| Efficiency Bandwidth Product (EBP) | 47.6 |
| Linear Excursion (Xmax) | 32.0 mm |
| Thermal Power (Pe) | 1500.0 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 Adire Audio Brahma X Mk2 15″?
Load Forge's calculated alignment puts Adire Audio Brahma X Mk2 15″ in a 161.1 liter vented enclosure tuned to 23.5 Hz, reaching an F3 cutoff of approximately 21.3 Hz.
Can Adire Audio Brahma X Mk2 15″ be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 85.0 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 37.2 Hz.
What port dimensions should be used for Adire Audio Brahma X Mk2 15″ to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 20.0 cm with a length of 91.5 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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