After five months without any problems, the Subwoofer stopped working and just makes popping noises. Do I need a new one or is there something I can do to fix it?

I would check the caps on the power supply. They are rather large electrolytic capacitors that will look like they burst and/or leaking. When these die, the caps ground and the sub will make a loud buzzing sound. If you are handy with a soldering iron you can replace them yourself. Replace them with the same voltage or a little bigger and same with the size.

If the cap. says 16v 4700pF on it, for example, a 20v 5300pF or a 16v 6200mF cap. will work for this application.

the noise may be comming in on the audio line.

if the unit is sort of new and this is a loud popping (snap) noise, this is a problem with many models and manufacturers. It is a plastic part expanding and contracting during the self-defrost cycle. There is no fix, it is a common "defect" which manufacturers can't or won't rectify. The noise is loud enough to hear in other parts of the house.Good news is mine stopped making noise after about 6 months. It does not affect the performance of the unit. If this is not a newer model, this is most likely not the problem. Good luck

Amp needs repaired - decide if worth fixing or buy a new sub

Is there something preventing you from trying a new cable? You're touching the problem when you wiggle it.

Hey. I have two PS210's One popped and stopped working 9 months in to it. Under warranty the technician said that Infinity produced these speakers wit ha known heat related problem. Some part burns up. He replaces them all the time. You can expect about a year's service as my seconf one just popped and died. It costs about $153 to fix it here in phoenix. Will never buy Infinity again from what I know

some popping noise is normal but if it is banging when it stops it needs a new compressor.what has happened is one or more motor mount is broken or weak it could run like this for months or years but it is annoying! if its warranty they have to replace it.

Each time our TV starts the snapping sound we reboot the cable box. Problem solved.

could be one of the internal wires is loose, possibly where it connects to the back side of input jack.

Check any wiring coming or going to the subwoofer. It sounds like it could be a loose connection.  Is there a LFE or bass boost knob on your subwoofer? Does turning that up/down cause the crackling (if it exists). If so, you could use some tuner cleaner to clean the contacts on the potentiometer knob.

If the crackling is on the subwoofer only, it might be damaged from bottoming out.  See if you can remove the baffle or grille covering the woofer and inspect for visual problems. You can also try to lighly push in and out on the subwoofer to hear if it makes any scraping sounds. If so, it is definitely damaged and the driver will have to be replaced.

Mike