Usually use 2 mics - for a grand I have tried just under the highest point of the lid and back a bit for the low end--depending on the personality of the instrument I have had success with that. My husband is an audio engineer who obsesses over creating the perfect stereo piano sound. He uses high end condenser mic's (BLUE--is his favorite brand)--and that is what makes the difference.for a lower budget... a shure 58 placed above the lid usually will get a decent return. It's equally important to deaden the room if the surfaces are reflective and you don't want an overly bright timbre. Sometimes placing a blanket over the lid and recording from above--and slightly to the right--gets that nice dark mellow sound that you can add to later in the mix.Are you digital or analogue? what format do you use and what kind of patch? I have used cubase and protools