The PHL 3901Nd is a 10" coaxial equipped with a neodym magnet system, it gives a high SPL (96dB/1w/1m) and a large frequency range (50 to 2500 Hz). The 3901Nd has a heavier moving than the PHL 3900Nd, then a lower frequency resonance (Fs) too. This coaxial driver PHL 3901Nd is provided without the high frequency driver, then you can install the 1" troath compression driver you want. The coaxial PHL 3901 Nd is good in a 10 Litre bass-reflex box accorded at 80 Hz.

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