The thing is every room is different. Yes, the way out is more depth to the sound but there is more to it than that, weight, body, and tone to the music also must be taken into consideration on speaker setup. Go for a balance because there is no perfection, learn your room, and do the best you can to have some of both. I've had my M3's 30" from the front way they sound good also, 4' and they lost body to the music in my room, lots of detail of course, but that is not how real music sounds. No room is perfect but you got to learn how to get the most out of it. My view is you go close to the front wall and listen for total speaker sounds, bass, mids, and highs, and then you slowly pull them out and see how those areas start to change there will be a spot where you get a great balance of all, then after that, you will notice a loss of that balance that is when you know to go back to where in your room they sounded the best. If just pulling them away from the front wall is all it took, then we all go 3-5' and be done with it. Wish it was that simple. It is a learn-as-you-go process.