英国 国都

ESL-2815及ESL-2915是QUAD的参考级扬声器，亦是现时世界上最优秀的扬声器之一；从透明度、无音染程度的表现，可说是全无对手。不论是微弱或是复杂细致的讯号，它们都能一一展现出来。QUAD静电扬声器的发声静电片采用了最新科技制造，令重播时的准确性和速度感均达至最理想；同时应用上专利的电极圈（delay-ring）技术，营造出完美的单点发声效果，放出令人惊讶的音场和结像！而且QUAD的静电扬声器全段音频只由静电片发出，讯号不经分音器，除了更加传真外，亦没有高、低频不接的问题。

1956年，Quad(国都) 推出了第一款静电扬声器，震惊了世界，成为业界内的先锋，并被国际音响界定义为静电扬声领域的皇冠。

QUAD(国都) ESL系列一直以来都以其最自然的声音而闻名于世，从来不添加或漏掉音乐中的任一元素，这也是ESL这一系列所坚持的设计目标。

ESL2912沿用了QUAD的经典堆挽式技术，将声音的速度和准确度独特的结合了起来，而这种结合只有静电音箱才能实现，保留了QUAD原生设计理念，同时在扬声器外观，金属工艺和板材外饰方面均有融汇创新。

ESL系列QUAD独家准李技术——同心圆延迟线圈发声方式：发声振膜并非一大块，而是由许多个同心圆组成，每个电极（同心圆）连接上一个经准确校正的讯号延迟电路。声音先从圆心发出，再到邻近的外圈，一圈一圈向外扩散，从而形成理论上的点声源发声。

静电扬声领域的皇冠

最自然的声音

经典推挽式技术

近乎完美的透明度和最小的音染

Quad’s reference electrostatic loudspeakers are regarded amongst the finest loudspeakers in the world in their transparency and lack of colouration. It should be noted that whilst moving-coil loudspeakers are the norm, the physical principles upon which they work are fatally flawed - and not even the latest advances in materials science can address their shortcomings. Quad alone has sought a different path - to push the boundaries of electrostatic technology to the point where our ESLs are closer to the ideal loudspeaker than any other.

Quad's patented panel technology results in a combination of the speed and accuracy only possible from an electrostatic loudspeaker; together with the imaging and sound-staging only possible from a theoretically ideal point source; and the coherence and continuity of a single drive unit. With possibly the lowest distortion of any loudspeaker, the ESL can be enjoyed for hours on end without fatigue; never adding or subtracting from the original recording. Even at low volume levels, they retain the full detail and drama of the music.

In short, the Quad ESL technology is unique in its clarity of sound, lack of distortion, lack of interference, and continuity of response. Quad’s reference loudspeakers are the absolute pinnacle of that technology. Engineered without compromise, they are undoubtedly considered modern classics.