Your speakers are designed to be used with low power amps. You should talk to Ralph (atmasphere) for suggestions. Ralph will say that your speakers are medium easy to drive (high impedance) and efficient (sensitivity), though. Ralph says that as you increase the power of an amp you increase distortion, I think, I can't really speak for Ralph. He builds amps and really knows his stuff.
Do a member search and ask him for his advice. He is quite free with it here.
Do a member search and ask him for his advice. He is quite free with it here.