Speaker Positioning


I know from speaker position is critical in achieving the best results from a given system. Is there a dynamic way to measure placement of each speaker to make certain they are the exact same distances from back/side wall, cabinets, seating, etc. beyond a measuring tape and listening to the results? Seems to me if minor differences pay large returns, you could be tinkering with this a long time.  Thanks for the indulgence.  
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RE: Speaker Positioning:

Hi - Speaker positioning is critical to achieving the best sound possible. Actually, there is such an instrument that can tell you if your speakers are placed correctly and/or in the best space possible. It's called your ears. And if you cannot tell the difference, have an audiophile buddy come over to give you a hand (and an ear!).  
I agree with the statement above. You used your ears to select the type of speakers you purchased, why stop there. Just take your time positioning your speakers for the best possible sound, patience will have its rewards.
A tip if you have a symmetric room and are trying to get the speakers in the same spot with same toe-in.  Cut 3 boards or dowels.  On that is the distance from the front wall to the rear corner of the speaker.  One that is the distance from the side wall to the rear spike and one that is the distance from the side wall to the front spike.  You can then use these three to set the other speaker in the exact position relative to the front and side wall and the toe-in will be the exact same.  Again, this is only relevant if you have a symmetric room.
Is speaker placement not also dependent on the type of speaker? I've had dynamic, electrostats, and currently horns and each required significantly different positions and room treatments to get the "best" sound.