Might also want to look at this:
http://www.audioholics.com/diy-audio/upgrade-speaker-crossover-polk-audio
The tool you really want to use is the Parts Express DATS V2. It will let you measure every single component in your speakers. BUT, you can probably get going with just a multi-meter.
I'd be most suspicious of the woofers. Take out each driver and measure the DC resistance with a meter. All 4 woofers should measure identically.
If they all measure well I'd be most suspicious of C1. Replace both with speaker grade electrolytic, avoid replacing with film. Parts Express is a good source for these.
Once you get it working, replace the thermistor with a resistor (Mills?) and the 2 x 12uF caps with Mundorf MKP or similar.
http://www.audioholics.com/diy-audio/upgrade-speaker-crossover-polk-audio
The tool you really want to use is the Parts Express DATS V2. It will let you measure every single component in your speakers. BUT, you can probably get going with just a multi-meter.
I'd be most suspicious of the woofers. Take out each driver and measure the DC resistance with a meter. All 4 woofers should measure identically.
If they all measure well I'd be most suspicious of C1. Replace both with speaker grade electrolytic, avoid replacing with film. Parts Express is a good source for these.
Once you get it working, replace the thermistor with a resistor (Mills?) and the 2 x 12uF caps with Mundorf MKP or similar.