Different speakers have physical set up differences which have to be considered. Quite often very different. Unless you are time constrained it pays big dividends to spend the time to ensure the speakers are optimally positioned for their best sound. You can't assume that where your old speakers were placed is going to work for other speakers.
Also, long term listening to each speaker with familiar (very!) music is, for me anyway, essential. There are often subtle differences you might not hear, or which are obscured, during short sessions. And, if you find things like brightness or bass boom (or no bass) you've got to figure out if its the speaker, the speakers placement or it's amplifier.
Take your time! :-)