Perhaps channelling German stereotypes, German pro audio magazine Sound and Recording has the best loudspeaker measurement regime I have ever seen. Audio engineer Prof. Dr.-Ing. Anselm Goertz takes demanding anechoic measurements from 4m at an acoustics lab. Their measurements include: unsmoothed on-axis response, horizontal AND vertical polar maps (a.k.a directivity sonograms), max SPL at 3% and 10% distortion, phase response, group delay, in-room response (presumably at the magazine's offices), waterfall graphs (a.k.a cumulative spectral decay), multitone distortion and sometimes even more. They have compiled their measurements for over 80 loudspeakers - primarily active monitors - into a downloadable pdf sold for 6.90 euros. It is an impeccable resource that reflects the ASR ethos. They deserve all the support they can get, especially since they have provided several sets of measurements for free online (a great gesture imo given the amount of work they've to do). The price is fair. We are talking pennies per speaker for world-class measurements. Highly recommended. Here's an example (scroll down and use Google Translate).