31NFR是一款高效（84分贝 1瓦/1米）3英寸全频扬声器，具有非常线性的频率响应特性和高功率处理能力。31NFR采用轻质阳极氧化铝锥形组件和NBR单辊几何环绕。该组合在各种条件下提供高效率、扩展的高频响应和持续的输出，同时在该扬声器的工作范围内产生低谐波失真。磁路设计REDCATT工程师开发了具有小形状因子、高完整性磁通隙和低失真特性的钕基磁路。磁路设计经过优化，可产生最小的磁通量调制，提供卓越的稳定性。铜解调杯安装在t极上。

The 31NFR is a high efficiency, (84dB 1watt / 1 meter) 3-inch full range speaker with very linear frequency response characteristics and high power handling capability. The 31NFR uses a lightweight anodized aluminum cone assembly along with a NBR single roll geometry surround. The combination provides high efficiency, extended high frequency response and sustained output under variety of conditions, while generating low harmonic distortion over the working range of this speaker. Magnetic circuit designREDCATT engineers have developed neodymium based magnetic circuit with small form factor, high integrity magnetic flux gap and low distortion characteristic. The magnetic circuit design is optimized to generate the minimum amount of flux modulation, providing exceptional stability. Copper demodulation cup is assembled over the t-pole.