Markaudio Alpair 7 MS
Best box: 7.5 L bass reflex tuned to 52.5 Hz · F3 63.7 Hz
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Comparable 4.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Markaudio Alpair 7 MS 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) | 7.5 Liters |
| Tuning Frequency (Fb) | 52.5 Hz |
| F3 (-3 dB Cutoff) | 63.7 Hz |
| F6 / F10 Extension | 46.8 Hz / 40.0 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 24.9 cm |
| First Pipe Resonance | 691.0 Hz |
| Estimated MOL @ F3 | 95.2 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 8.8 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 91.0 Hz |
| F3 (-3 dB Cutoff) | 92.0 Hz |
| F6 / F10 Extension | 69.5 Hz / 52.5 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 74.7 Hz |
| Total Q (Qts) | 0.565 |
| Electrical Q (Qes) | 0.744 |
| Mechanical Q (Qms) | 2.35 |
| Equivalent Volume (Vas) | 5.0 Liters |
| Diaphragm Area (Sd) | 50.3 cm² |
| DC Resistance (Re) | 7.2 Ω |
| Efficiency Bandwidth Product (EBP) | 100.5 |
| Linear Excursion (Xmax) | 4.5 mm |
| Thermal Power (Pe) | 15.0 W |
| Nominal Diameter | 4.0" |
| 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 7 MS?
Load Forge's calculated alignment puts Markaudio Alpair 7 MS in a 7.5 liter vented enclosure tuned to 52.5 Hz, reaching an F3 cutoff of approximately 63.7 Hz.
Can Markaudio Alpair 7 MS be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 8.8 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 92.0 Hz.
What port dimensions should be used for Markaudio Alpair 7 MS to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 24.9 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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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