Alright so I've been telling my friend that I was going to fix up his logitech z506 surround sound system well about 6 hours ago I bought it from him instead to keep and took about the rear right speaker but to my surprise there is nothing visually wrong with the speaker everything is in tact and all wires are connected properly but everything sounds inverted there is no bass at all and the vocals are very very distant(this is only on the rear speakers the others are fine and the main controller speaker doesnt work at all and it has been dropped a lot so I assume a wire disconnected)