本帖最后由 sigh 于 2013-3-30 13:42 编辑
AT在10寸及以上大尺寸低音单元的三明治已经标准化三款, 10C772510KAP , 12D772510KAP, 15f1022510KAP .
在10寸,12寸,15寸的单元, 三明治对比与PP盆,最大的区别在于低音的表现。KA(混合音圈骨架)和三明治结合,即使在振幅很低的情况下,低音表现也是很有力,干净,精细,音场体现精确。
大口径单元的阻尼特性和Qms是至关重要的。AT的三款三明治单元,在设计上明显的提高了单元的Qms。从12寸的12D77看其Qms 为5.5 ,而在同等尺寸的12B77 的PP盆的Qms 仅为2.5。这势必大幅度提升单元的前沿特性,喇叭瞬态好,带来的效果就是速度的极度提升,即使ETON的12寸的Qms 也仅为3.52 。
最难得是在提高Qms 的前提下,AT的12D77通过Qes的设计, Qts 仅为0.25 ,保证了喇叭后沿特性的优异。这从T/S参数上解释了喇叭的品质。
12D77的低频延伸明显提高,与15寸单元对比来看,可以在相对于较小箱体容积下,达到平坦的对等低频。
The KA system is implemented in the Sandwich cone drivers and is a mixture of Kapton and Aluminium voice coil bobbin. This means, the driver acts as a pure Kapton voice coil driver, as long as the voice coil is within its linear working area. It also presents a very low mechanical resistance, which allows the driver to play bass with authority, even at low levels.
All drivers are naturally generously ventilated, under the spider, from voice coil gap and not least through the pole piece, allowing the whole moving system to travel fast and freely, without any compression.
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