You can improve the sound of your Mini-Grands with a replacement crossover. I replaced mine about 3 years ago and I'd never go back to the original crossover from Apogee. Times and technology have changed, but the ribbons are still far ahead of box speakers.
http://www.northcreekmusic.com/Stage/StageCrossover.htm
-Rick
http://www.northcreekmusic.com/Stage/StageCrossover.htm
-Rick