Its not you. You've done nothing wrong. If it can be fixed again under warranty do that and sell it. If not then no point throwing good money after bad. But no point throwing the sub out either. Not when it can still be used as a perfectly good passive sub.
Go somewhere like PartsExpress.com find the Dayton sub amp, find a nice sub kit. Get 3 now, or however many you can afford. Always can add more later. The more you get, the better it will be. But even two or three will be massively better than what you had. And a lot more reliable.
Go somewhere like PartsExpress.com find the Dayton sub amp, find a nice sub kit. Get 3 now, or however many you can afford. Always can add more later. The more you get, the better it will be. But even two or three will be massively better than what you had. And a lot more reliable.