As others has stated before, its about positioning. Even with generic 'black' cables you should be able to get the 'stage' if you put the speakers (and if your rooom alows it) right.
Try playing with them, space behind speakers is crucial for 'depth' ,find the best angle, first 'aim' at the center of your listening position or maybe just little bit in front, or perhaps aim 'for the shoulders' (yours, in your sitting position), try different angles, but be sure to mark your starting point, so that you can be very precise when moving them next time. Mark the one you like the best,for fine tuning,even one inch can make big difference.
It took me few months, laser meter and lots of tape on parquet floor to get it right, with small two way monitors and in almost dedicated room to get it right..
Power cords and conditioners (if choosen right) will improve the overall sound, but not before you you place your speakers in a 'right' way...