Markaudio Alpair-11MS Grey
Best box: 12.0 L bass reflex tuned to 48.8 Hz · F3 50.4 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Markaudio Alpair-11MS Grey 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) | 12.0 Liters |
| Tuning Frequency (Fb) | 48.8 Hz |
| F3 (-3 dB Cutoff) | 50.4 Hz |
| F6 / F10 Extension | 43.9 Hz / 38.2 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 17.0 cm |
| First Pipe Resonance | 1011.0 Hz |
| Estimated MOL @ F3 | 99.8 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 5.3 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 89.3 Hz |
| F3 (-3 dB Cutoff) | 91.4 Hz |
| F6 / F10 Extension | 69.3 Hz / 52.3 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 44.0 Hz |
| Total Q (Qts) | 0.34 |
| Electrical Q (Qes) | 0.401 |
| Mechanical Q (Qms) | 2.22 |
| Equivalent Volume (Vas) | 17.7 Liters |
| Diaphragm Area (Sd) | 111.0 cm² |
| DC Resistance (Re) | 7.2 Ω |
| Efficiency Bandwidth Product (EBP) | 109.6 |
| Linear Excursion (Xmax) | 8.0 mm |
| Thermal Power (Pe) | 35.0 W |
| Nominal Diameter | 6.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Markaudio Alpair-11MS Grey?
Load Forge's calculated alignment puts Markaudio Alpair-11MS Grey in a 12.0 liter vented enclosure tuned to 48.8 Hz, reaching an F3 cutoff of approximately 50.4 Hz.
Can Markaudio Alpair-11MS Grey be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 5.3 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 91.4 Hz.
What port dimensions should be used for Markaudio Alpair-11MS Grey to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 17.0 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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