Judit,
Try active biamping. A ss amp could be used to power the woofer, and a tube amp could power the squawker and tweeter. In this way you could use the strong base advantage of the ss amp to get a clean, solid base slam; and use the mild mannered advantage of the tube amp to bring out a more pleasing, soft, but detailed sound from your squawker and tweeter.
Try active biamping. A ss amp could be used to power the woofer, and a tube amp could power the squawker and tweeter. In this way you could use the strong base advantage of the ss amp to get a clean, solid base slam; and use the mild mannered advantage of the tube amp to bring out a more pleasing, soft, but detailed sound from your squawker and tweeter.