First, thanks to all who have responded.
To Yogiboy, useful advice, but also a bit risky because unless you have duplicates of the same books used, there will be a chance that the speaker will be lopsided and unsteady,and fall over. I did this once with a pair of Music Hall Marimba's resulting in a crushed.corner
The speaker was a turkey but I was able to sell them, but got beat-up on the price because of the damage to the corner. However, I might give it a try with one large dictionary per stand.
The measurements seems the way to go, so I will try that first, I really don't want to buy another pair of speaker stands, and several offered on e-bay by Sanus or Target, Bush are crap. I lucked out with my current stands which look like a prop from a Woody Allen laugher, called "Sleeper" where he is wakes up in a futuristic world
Unfortunately, the stands are only 21 inches high. Regardless, the Dentons are outstanding speakers which I have only minor quibbles. HAS ANYONE BIWIRED THEM TO SEE IF THE SOUND IS FURTHER IMPROVED??