What's the purpose of this LRC in this xover?

[andy2]

This is the xover of a speaker I bought. Could you tell me the purpose of the L1 C1 R1 circuit of the xover? Are they meant to be a notch filter or it is for something else?

Please see the attached pdf file.

 

[Brian Beck]

This would have put a slight notch at around 2KHZ if there had been a series resistance between the amplifier and the crossover, but there isn't as you show it. More likely it presents a shunt 10 ohm resistance at the crossover frequency to keep the whole speaker's impedance from peaking too high at that point and developing too large a reactive phase angle (which might upset some amps). Only conjecture since you didn't show the rest of the speaker.