Looks like the 230 is a little over 70 W into 8 ohms (Fig. 5) before the distortion gets too high, and around 100 W (Fig. 6) into 4 ohms. For 6 ohm speakers, figure somewhere around 85 W/channel of usable power.
With the sensitivity of your speakers, it may be adequate. But, much depends on the size of your room and how loud you like to listen to your music. If it is a medium to small room, and you listen at reasonable volume levels, it should be fine. If, however, you have a big room and like to crank it up, you probably need something more powerful.
Here is a review that came out today on the Leak Stereo 230: