Outdoor loudspeakers are not that difficult to install if you know how to. I have done a few installs in the past and would be glad to share my thoughts in this post. Before attempting to install the speakers outdoors, first verify that the speakers are suitable for use outdoors. If the manufacturer has not specifically qualified them for outdoor use then chances are they’re not. If you are installing them in the protected areas such as on the roof then you can probably get by installing regular loudspeakers which don’t necessarily have to be waterproof. However, if the speakers are exposed to rain then I would caution against that. Rain can damage any speaker very quickly.
In addition to the speakers being waterproof any metal objects such as the grill of the speakers and also the mounting hardware which you are going to use have to be made of stainless steel or another material which is coded with the layoff paint which prevents water creeping in. Otherwise the speakers will start rusting as will the mounting hardware. After having qualified the speakers, it is now time to start the install.
The main consideration which probably is going to affect the location of the speakers is how you are going to run the wires. If you are installing speakers on the backside of your house then I would recommend drilling a hole into the wall such that the speaker cables go directly from the location of the speakers inside your house. If that is not possible then you will have to a conduit which will be mounted outside of your house in order to hide the cables. As an alternative, if you do have power outside of your house then I would recommend installing wireless speakers. In that case you only have to worry about powering the speakers which in this case is fairly easy. You don’t have to run wires anymore except for the power cord.
However, wireless speakers have limited range and if the signal has to pass through wall than the range will be a lot less then the range which is specified by the manufacturer of the speakers. Before setting up wireless speakers, I highly recommend that you do a test run. That is to establish that the speakers will work reliably with their supposed to be installed. Also, during this test make sure you have people walking around the speaker in order to block the wireless signal similarly to what will happen when the speakers are actually being used. When installing the speakers regardless of whether they are regular wireless speakers, make sure that there firmly inserted into the mounting bracket so that they cannot drop loose. Strong winds can actually dislodge a speaker which is not properly fitted. Also, if you using mounting hardware which was not specifically shipped for the model of your speakers then make sure that you pick the right size. Picking the wrong size can not only damage your speakers but also bear the risk of the speaker dislodging from the mounds.