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he Alpair 12P is the largest full-range driver produced by Markaudio. This driver is adevelopment 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 itsoperation and performance.
BriefMarkaudio Alpair series drivers are totally custom designed and built. All components (apartfrom the magnet) are individually designed and engineered with their own tooling and mouldmaking sets. Alpair drivers are made by highly skilled engineers, they arenʼt “mass produced”.
Key FeaturesThe change to a custom paper cone with a more shallow profile reduces mass and increasesdispersion performance. The new cone is only 21-mm deep compared to the metal unit at 26-mm. The 12P employs and new custom CCAW coil with an aluminium/paper wrap, vented, low-mass thin-walled body. The spider is particularly special. Designed by Matsubara San, itemploys a new long throw profile set together with a ribbed body to maintain linearity. The frontsuspension remains the same as the previous model; A design by Lu Yi Ping, its ultra thin walldoesnʼt support the cone. In terms of mechanical load performance, the 12P remains a singlesemi-free to air driver, possibly a unique design in its class.
PerformanceThe 12P remains pure to designer Mark Fenlonʼs current criteria which is to make purist, singlecone drivers that are full-range capable without the use of phase plugs, co-axial centre tweetersor whizzers. The 12P is 92dB efficient (1w/m2), operating to 22-kHz (-3dB) and having aresonance frequency of 42Hz (+/- 2Hz). The 12Pʼs power-train (cone, cap, coil andsuspensions) is mechanically efficient and linear, requiring only modest powered amps to makeit perform well. This driver is aimed strictly at the “audiophile” end of the market. Its cone ishighly-resonance sensitive so clean low-distortion amplification and source components areadvised.
For those listeners who value absolute detail, dynamics and clarity, the Alpair 12P is an excellentcandidate. Iʼd like to thank all those who assisted in the design and development process,especially existing Markaudio driver users, whoʼs feedback was instrumental in the 12Pʼs finalincarnation.
Revc= 7.000 OhmFo= 42.149 HzSd= 147.410 cm_Vas= 43.060 LtrCms= 1.396m M/NMmd=9.188 gMms= 10.217 gBL= 7.540 T·MQms= 1.981Qes= 0.333Qts= 0.285Levc= 53.952u HNo= 0.936 %SPLo= 91.730 dB
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