Markaudio Alpair-12P 8" Paper Cone Full Range
Price for 1 piece
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Product description
The Alpair 12P is the largest full-range driver produced by Markaudio. This driver is a development unit following on from the original metal coned Alpair 12 produced in 2009/2010. Several major design changes make this Alpair radically different from the original in terms of its operation and performance.
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Highlights
Custom paper cone
Synthetic rubber surround
Special voice coil and spider
Power train suspension structure
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Product details
MarkAudio Alpair-12P 8" Paper Cone Full Range
The Alpair 12P is the largest full-range driver produced by Markaudio. This driver is a development unit following on from the original metal coned Alpair 12 produced in 2009/2010. Several major design changes make this Alpair radically different from the original in terms of its operation and performance.
Markaudio Alpair series drivers are completely custom designed and built. All components (apart from the magnet) are individually designed and engineered with their own tooling and mould making sets. Alpair drivers are made by highly skilled engineers; they are not “mass produced”.
The change to a custom paper cone with a shallower profile reduces mass and increases dispersion performance. The new cone is only 21-mm deep compared to the metal unit at 26- mm. The 12P employs a new custom CCAW coil with an aluminum/paper wrap, vented, low mass thin-walled body. The spider is particularly special. Designed by Matsubara San, it employs a new long throw profile set together with a ribbed body to maintain linearity. The front suspension remains the same as the previous model; designed by Lu Yi Ping, its ultra-thin wall doesn't support the cone. In terms of mechanical load performance, the 12P remains a single semi-free to air driver, possibly a unique design in its class (see description and picture below).
The 12P remains pure to designer Mark Fenlon's current criterion which is to make purist, single cone drivers that are full-range capable without the use of phase plugs, co-axial center tweeters or whizzers. The 12P is 92dB efficient (1w/m2), operating to 22-kHz (-3dB) and having a resonance frequency of 42Hz (+/- 2Hz). The 12Pʼs power-train (cone, cap, coil and suspensions) is mechanically efficient and linear, requiring only modest powered amps to make it perform well. This driver is aimed strictly at the “audiophile” end of the market. Its cone is highly-resonance sensitive so clean low-distortion amplification and source components are advised.
For those listeners who value absolute detail, dynamics and clarity, the Alpair 12P is an excellent candidate. I'd like to thank all those who assisted in the design and development process, especially existing Markaudio driver users, whose feedback was instrumental in the 12Pʼs final incarnation.
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Specifications
- Article number Alpair-12P
- Woofer Series Alpair Series
- Woofer Type Full-range
- Nominal Diameter 8"
- Power Handling (RMS) 30 Watts
- Impedance (Z) 8 ohms
- Sensitivity 91.730 dB
- DC Resistance (Re) 7 ohms
- Voice Coil Inductance (Le) 53.952u H
- Resonant Frequency (Fs) 42.149 Hz
- Mechanical Q (Qms) 1.981
- Electromagnetic Q (Qes) 0.333
- Total Q (Qts) 0.285
- Diaphragm Mass Inc. Airload (Mms) 10.217 g
- Moving Mass Of Diaphragm (Mmd) 9.188 g
- Mechanical Compliance of Suspension (Cms) 1.396m M/ N
- Surface Area of Cone (Sd) 147.410 cm²
- BL Product (BL) 7.540 T·M
- Compliance Equivalent Volume (Vas) 43.060 Ltr
- Maximum Linear Excursion (Xmax) 9 mm
- Overall Outside Diameter 8.15"
- Overall Depth 3.79"
- Baffle Cutout Diameter 7.32"
- # Mounting Holes 6
