deciphering a passive crossover

My car's previous owner had a nice stereo installed, but when he removed it, he left the speaker wires.  Attached to the speaker wires for the rear speakers are a crossover network.  So, I'm wondering if I might recycle it, and use it with the Silver Flute 5.5" 4-ohm speakers I'm installing there.

Here are the values for the inductor, resistor, and capacitor:

Inductor = 0.3 inH

Resistor = 5SG 15ohm J MD IWAKI

Capacitor = nichicon 6.8uF 50V BP-S (k)

I believe this is a bandpass network, but I'm unsure what the cutoff frequencies would be.  Thanks for any help you might give!

Nick

Here are some pictures, if they help:

Thanks,

Nick

Let's try this again...

The network is wired like this: the + speaker wire running between the amp and the speaker is separated by the network.  The network is built by taking a capacitor leg,a resistor leg, and one side of the inductor coil, and tying them together.  The same thing is done with the other legs.  The + speaker wire connects to the network by entering on one side, and exiting on the other.

Thanks again,

Nick

Nakamichi SP-55C.  4 ohms.  Two-way speaker.

These speakers were left behind...they're fairly well rusted out and look absolutely shot.  They were mounted in the rear seat speaker position of a 1983 Porsche 944.

Thanks,

Nick

Wired as you described, it looks like a parallel notch filter that was used to suppress unwanted exaggeration in the 10 kHz region.  See this calculator.  I wouldn't use it for any other speaker, and I wouldn't even reuse it for the same speaker it was made for.  The cap looks to be the electrolytic type and should be considered no longer useable.  And not to be left out, the coil is tiny gauge and thus has a high DCR, and the resistor is low quality and inductive (I'm willing to bet).

(...assuming your post above detailing the values meant to read " .3 mH " for the coil...)

Thanks for the advice, and for the link to the calculator.  Just wanted to be sure it wasn't going to be useful before it hit the bottom of the trash can!

Thanks again,

Nick