You should be fine but I would suggest you take your amp along to the dealer and ask to hear them with it.
The 684 is pretty sensitive, which means it will play louder for a given level of wattage than a less sensitive speaker. The other thing to bear in mind though is the speaker’s resistance. The 684 is nominally 8ohms, which is reasonably high but it does drop to 3 ohms minimum, which is quite low.
The resistance that the speaker presents to the amp is important; the lower the resistance, the more wattage it will draw from the amp. So very low resistance will mean the amp would need greater capability to continue doing its job.
At 8 ohms your amp will happily drive your speakers. At 3 ohms, it may struggle. If the speakers rarely dip to that level then you shouldn’t have any problems, but get a test to make sure.