I'm not comparing plasma units to projectors...apples and organges. "...the InFocus unit has a 16:9 switch which I use for any widescreen presentation. So, no, we don't experience any loss of "screen" on my 14 foot diagonal 16:9 aspect ratio picture."
Glad to hear your projector is capable of widescreen. However, if you're pushing that LCD projector with 900 lumens and contrast of 400:1 to a 14'screen, I can't imagine much of a picture. The larger the screen (wall in your case), the more lumens are needed which also impacts on your black levels. 400:1 contrast ratio is a business environment range...poorly suited for true home theater viewing. "You still haven't posted how much you spent for your "thumping" sound experience."
Probably about 3 times as much...I've acquired it over time. You didn't post what kind of power your Yamaha is putting out, nor what kind of speakers used.
Look, enjoy your portable system, but don't blow smoke up our backside and try to say it's a "great" home theater experience. If you are truly showing a 14' screen on a painted wall for 15-20 people, then it must be in a moderate to large room. For that you need brightness and good black levels on the video side, power and large drivers on the audio side. The system you described doesn't have either. BTW, your speakers are analog, and the most important part of the audio chain.