It might, but unfortunately there's not enough information in your post for anyone to really say. There's no indication of the speakers you're using, the room dimensions, the volume level you want to achieve, budget, what your current amplification is (receiver?), etc. We would need more information about your specific circumstances to provide any guidance.
Given the size of your room, the 91dB sensitivity rating and 8 ohm load of those B&W speakers, plus the fact your receiver is pushing out over 100 watts per channel, it's unlikely you would notice much of a difference by adding an external amplifier.