you can google it... They are inline crossovers that plug into your rcas, and the x over point chosen stays a constant, unlike in a passive setup, which fluctuates with the impedance of the driver while playing. Because it is done pre-amplified signal, there is no wasted power. Passive xovers burn energy filtering an already amplified signal, so you lose a slight amount of power when using them.
Also..... I am running a set of CDT ES-02's which also show a freq range of 250 - 20hz...
They recommend crossing at a higher freq for power handling purposes. I have crossed mine as low as 500hz at 100 watts, and had no issues with them.
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