Although I'm using Tannoy Berkeley's I'd agree with the previous advice about getting them at the correct height, ie the tweeter at or near ear height.
I've seen photographs of when Tannoys were used at the Abbey Road studios. They had them placed upon what looked like wheeled tea trolleys that must have been 18-20 inches off the ground.
That would certainly make placement a lot easier, and I guess exact height wouldn't matter so much if you're listening from a distance over 10 feet away.