No. Use the B&K, it won't be a problem unless you really crank the volume. (really, really crank it!).
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Volume and power don't have a linear relationship. The smallest increase in volume the ear can perceive is about 3dB. Raising the volume 3dB requires DOUBLE the power from your amp. And doubling a given volume requires TEN times the power from your power amp. Sudden loud passages can require A LOT of power from an amp. Your speakers should be quite happy with a 400 watt amp. Driving any speaker to distortion, clipping the amp, will damage most speakers. But way short of that, your 400watts will be put to good use.
Are you sure the amp is rated for 400 Watts at 4 ohms? Don't assume that power output doubles as the resistance is halved - check the owners' manual spec section to see what the power actually is. And even if it is 400W, I also agree that you won't damage your speakers at normal loud listening levels.
Clean power won't ever hurt a speaker unless you are getting into deafening levels. You are going to be deaf if you try to listen to your speakers at 300 watts continuosly. You may get peaks (canon blasts, explosions...) that will test your system. However, as long as the amp is distortion free, you are safe. It doesn't get much cleaner than B&K.