We've added "Speaker(s)" as a new search parameter to Feature Search. Just click on More Options and check the Speaker(s) box to include projectors with speakers. Add any other features you need and click Find Projectors.
The results page will display all projectors that have the features you want and the number of speakers and wattage information will appear in the lower left of each projector listed. As of this posting there were 889 projectors with speakers. The search results will display how many speakers and watts per speaker.
In the Sort by menu select Speaker(s) to order the projectors in descending order of projectors with the most speakers. To see a compressed version of the Speaker(s) results, click Hide Details.
Enjoy! If you have some suggestions on improving Feature Search, add your comment below.