I bought a used srx828sp on eBay and it seems like UPS dropped it on the edge. anyway, I hooked it up and noticed the left speaker not working. I thought the speaker was damaged so I took the grill off to inspected it, both speakers looked fine so I took it both out and hooked up the left speaker to the right wire and it worked fine. Now I'm thinking it's the amp. I called JBL and explained the problem and they told me to take to a service center. I then called the service center and give them my information and they said there is nothing they can do about the new srx800 series because JBL have a safe launch service. I called JBL again to asked what is the safe launch service and they said to take to the service center and they will figure out the next step.