System that sounds so real it is easy to mistaken it is not live

The types of sounds playing through the stereo are usually a dead give away that it's the stereo. I don't have anybody in my house that's a great musician, or who can make a sound in my house sound like it was recorded in another acoustic space. Those recordings that have more pedestrian sounds like people simply talking, and were recorded in a space with a similar acoustic to my own, those have scared me a few times. One time I remember was when the system was on but I didn't know it, and a voice suddenly came over the speakers out of the blue. It gave me quite a shock. Another case was on headphones, of all things. I was listening to outtakes between tracks and in the recording some guy was laughing in the back ground. It sounded just like my friend's cackle and I got the impression he was somehow in the house when I thought I was alone in my house in Oregon and he was supposed to be in Florida with his girlfriend! 

Dispersion characteristics of real instruments tend to be very different than speakers, and that can be a giveaway. I read that Dunlavy tested his speakers in an anechoic chamber - on axis. He could get the speaker to fool someone in that situation so they couldn't tell if it was the real instrument playing in the anechoic space, or the speaker. Once you have a live acoustic space of moderate size it can be harder to fool someone in a blind test.  A drum kit played in a living room will create an intensity and impactful force of sound that I don't think any stereo speaker set can reproduce in that same space - and that's probably a good thing.  Possibly an array of speakers ready made just for the purpose could do it.