Stuartbmw3, I won't cheat you out of the pleasure of finding the Cardas methodology on line, but I would like to say that it is more applicable in concept than any particular specificity. I haven't read it in years but as I recall for box speakers in rectangular rooms it places the speakers about 1/3d of the length of the room away from the wall behind them, 1/3d of the width of the sidewalls away from the side walls. It places the listening chair at the apex of an equilateral triangle.
When I first used it I ended up using 1/5th in place of 1/3d and it worked well. Then I spent a few years fine tuning it! :-)
Another tip. Try toeing in your speakers once you have reset them until the axis of the speakers crosses well in front of your listening chair. Assuming your speakers are hot on axis this not only reduces high end energy, it minimizes 1st reflections off the closest wall and directs them off the opposite wall thus creating a long delay before they finally reach your ears. It has a similar effect with the signal bouncing off the ceiling. You can much more longer delayed signal related to the shorter delayed signal. For different reasons this can also increase the width of the sweet spot for listening.
Just something to play with. Have fun.
When I first used it I ended up using 1/5th in place of 1/3d and it worked well. Then I spent a few years fine tuning it! :-)
Another tip. Try toeing in your speakers once you have reset them until the axis of the speakers crosses well in front of your listening chair. Assuming your speakers are hot on axis this not only reduces high end energy, it minimizes 1st reflections off the closest wall and directs them off the opposite wall thus creating a long delay before they finally reach your ears. It has a similar effect with the signal bouncing off the ceiling. You can much more longer delayed signal related to the shorter delayed signal. For different reasons this can also increase the width of the sweet spot for listening.
Just something to play with. Have fun.