Using the crossover in the sub is fine, assuming that it's a nice sub with a quality crossover. Otherwise, you are degrading the sound.
More importantly, make sure your amp can handle the speakers. Check the impedance and the efficiency. Jolida's don't have a ton of power but can sound great with fairly efficient speakers, 90db or above.
Finally, Jolida's weak point is the stock tubes. Get rid of the stock chinese tubes. You don't need to spend a fortune but $20 tubes will do wonders.
More importantly, make sure your amp can handle the speakers. Check the impedance and the efficiency. Jolida's don't have a ton of power but can sound great with fairly efficient speakers, 90db or above.
Finally, Jolida's weak point is the stock tubes. Get rid of the stock chinese tubes. You don't need to spend a fortune but $20 tubes will do wonders.