I have found this site useful in comparing speaker specifications based on measurements. Give it time to load; it is a bit slow.
The forum is generally focused on objective measurement over subjective opinion, so the signal-to-noise ratio of the discussions are better than most forums. Bit there is a fair bit of noise since a large number of audiophiles are present.
I prefer mixing and mastering on system with speaker+room response as flat as possible and minimal group delay. But the whole speaker and room thing is a huge topic on its own.