wire on wall (pre plaster)
Now there is an option. Enter a company called Flatwire. The product is just as it sounds. Flatwire is a speaker wire that is thinner than a business card, and is designed to go right on your wall. You can get the product in a kit, which includes the wire, spray on glue, and cloth mesh tape. Once installed, the wire is unnoticeable. But you will want to know a bit about construction, or get some help.
If you know what you are doing, the install is not too difficult. You will want to follow the instructions step by step. In a nutshell, you start by spraying glue onto your wall to hold the Flatwire. Once dry, you apply the mesh tape and mud to cover it up. After some sanding and a second coat of mud and some additional sanding, you are ready for the texture. After the texture is done you are ready to paint. Once done, you will never know there is speaker wire under there. My install looks great, and they sound great too! I could not be happier. For more info, check out their website at: http://www.flatwireready.com/