Mark Audio Alpair 10P-A
The drivers of Mark Audio are well known and widely used by audio DIY-ers. Alpair 10P-A features glass fiber reinforced paper cone with a dust cap with a special shape made of the same material. The measurements were made after the manufacturer's recommended break-up procedure.
This is the manufacturer's brochure
My Measurements
| Driver Properties | Thiele - Small Parameters | ||||
|---|---|---|---|---|---|
| Chassis material | Plastic | Parameter | Measured | Datasheet | |
| Membrane material | Glass Fiber Reinforced Paper | Fs | 44.5Hz | 42.4 Hz | |
| Magnet System | Ferrite | Re | 6.1 Ω | 6.2 Ω | |
| Surround | Rubber | Qms | 2.33 | 2.42 | |
| Voice Coil Diameter | 25 mm | Qes | 0.36 | 0.38 | |
| Nominal Impedance | 8 Ω | Qts | 0.31 | 0.33 | |
| Sensitivity | 89.6 dB/W/m | Vas | 25 ltr | 29.9 ltr | |
| Rated Power | 30W | Le | 0.12 mH | 0.05 mH | |
Frequency response at 1m with 2.83 V input RED - on axis, BLUE - 15 º off axis, GREEN - 30 º off axis
The second, third and fourth harmonic curves measured at 2.83V input RMS. The distortion above 1kHz is extremely low, but something really is going wrong at 550 Hz...
Burst decay response, measured at 1m on axis
The impedance curve in 18 ltr sealed box
Conclusion
The Alpair 10P-A is multi-purpose fullrange driver, that already has been used in various constructions. My favorite one is big vent reflex (BVR) as it achieves the deepest and yet accurate low frequency performance.
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