I agree with Samac that the TSMs are very good speakers. I had a pair of Merlin TSM-SE speakers, and they were nice. It is my understanding that they were not a stock pair but had been tweaked for a review. I've heard the MXe version too.
However, I replaced the Merlins in my system with a pair of Silverline SR-17.5 speakers. I found that the Siverlines handled a wider range of music than the TSM. I also preferred the articulation of the 1st order crossover in the 17.5s. To get a more refined sound, I did, however, replace the stock capacitor and resistor. So if you just want to refine your SR-11s, I you might want to think about that.
You should listen to the TSM speaker to see if it works well with your range of music. It is a good speaker. The 17.5s with an upgraded crossover has the potential perhaps to give you the refinement for which you are looking along with more dynamics. But don't get me wrong, the stock 17.5 is an excellent speaker and worth your consideration whether you upgrade the crossover or not.