I have had my PSW-120 sub for many years. It has slowly been fading in performance. I already replaced the woofer but the problem that had a long time ago has now got much worse.
When I turn on my amp, it turns on the sub like it is suppose to. But in order for me to get it to start putting out sound, I have turn it up fairly loud and then turn the volume output on the sub to nearly max. Then it suddenly comes on with lots of thumping base. I then turn it back down to normal setting and it will operate as it should. Sounds like the main board in the sub is going out.
Can I just replace it with an aftermarket. I do not know if Polk will warranty it since it is so old and I already replaced the woofer.