So have any of these two sets of measurements revealed a fundamental difference between 'pro' and 'hi-fi' speaker types? Well, the 'pro' Dynaudio, thanks probably to its voice-coil construction, is best suited to being driven hard, and it has a well-controlled and appropriately balanced frequency response. The 'pro' KRK, through its higher sensitivity and reasonable compression performance, is also more suited to operation at high levels than either the B&W or the Wharfedale. So maybe there's a glimpse of a distinction here. But then the KRK is, in my opinion, let down by the questionable frequency-response characteristics I noted last month. The Wharfedale is pretty similar to the KRK in terms of its thermal-compression performance, but loses out through being around 3dB less sensitive. Its frequency response isn't really the stuff of a nearfield monitor either. Lastly, the B&W is not so good at elevated levels, but its exceptional frequency response performance still argues pretty strongly in its favour. In truth, there are a range of abilities across the four different designs, and it'd be a brave man to say that any group of two is obviously inappropriate.