Similar issue, but I don't think it's a loose wire. I'm using a 1/4 inch adapter to plug the headphone jack into an audio device. If it's fully inserted I get both left and right but no sub. If either loosen the jack in the adapter or the adapter in the audio device then I get left speaker and sub, but not right speaker. Any thoughts? I've tried 4 different 1/4 adapters. Everything works fine independent of each other. Headphones work fine into audio device and klipsch works fine plugged into my phone.