Click on the "Search" icon under the GL1800Riders.com banner, the one with the microscope next to it, not the Google Search.
When it opens, enter this info in the "search for keywords" box:
rear and speaker and install
It will bring up a long list of discussions. Click on the ones you want to read. When finished, click on your back button on your internet tool bar, and then click on refresh when you get a blank page. This will take you back to the long list of your search results and you can continue reading other posts.