Got a pic of the front of the sub and of the back of the magnet... could help match it up.
You sure it's not Polk Audio? If so that's easy to find under that model number, it's 425w
Here’s the back of the magnet.
It looks like it's probably from a guitar amplifier, so it's likely to be 8ohms. I'll try and find more but that's going to be a bit of a misfit in a car unless you have another one.
It will still work, theoretically at half the power but in reality probably not exactly half. You'll want to use ohms law to set it up but the manufacturers will give you no guidance on 8ohm ratings. I expect an amp capable of 240W at 4 ohms is enough. It's very old apparently. Is the cone in good enough condition to bother with?
It is a guitar amplifier speaker 100%. I WOULD NOT use it in the car. I would put it in a guitar amp, learn to play guitar with it and become a rock star bedding thousands of women. Unless you'd rather play some low output bass in your car. It will vibrate but it won't shake the car too much or sound that good as a sub. A midbass maybe.
You'd need a ~240W RMS @ 4 ohms amplifier. I'm with these guys though, I think it's not a very good car subwoofer to base any purchase on. One because it's very old, two because the ohms are higher than rated, three because it's low power, four because it's for guitars, and five because it's not a particularly high quality or value speaker.
