You don't want a forgiving speaker with McIntosh IMO. The new DALIs I heard were not all that forgiving (ribbon tweeter) but if your's are, then it is time for a change.
You don't mention your budget so I will guess. If I were you, I would look into using Triangles like the Celius ESw or Altea ESw (the latter is 2.5 way if you like that). These speakers are pace and imaging champs which will compliment the 2155 very well - and can be really sweet deals on Agon.
Other options are JM Labs, which is what I use with my McIntoshes. The older Electra series can be had cheap these days and they sound fantastic. The Chorus lines are cheaper still but shouldn't be overlooked cause their tweeter is best in class IMO. The JM Labs tend to have more bass and bigger soundstaging than the Triangles at the expense of some imaging precision.
Personal preference and taste must play a role for you to be satisfied so do some homework before buying. There are many great options. Anything from Thiel, B&W, Revel, and Paradigm Reference will also work great with your Mc. (I have first-hand experience with all of my recommendations.)
Be sure to post your thoughts about the sensitivity change.
Arthur
You don't mention your budget so I will guess. If I were you, I would look into using Triangles like the Celius ESw or Altea ESw (the latter is 2.5 way if you like that). These speakers are pace and imaging champs which will compliment the 2155 very well - and can be really sweet deals on Agon.
Other options are JM Labs, which is what I use with my McIntoshes. The older Electra series can be had cheap these days and they sound fantastic. The Chorus lines are cheaper still but shouldn't be overlooked cause their tweeter is best in class IMO. The JM Labs tend to have more bass and bigger soundstaging than the Triangles at the expense of some imaging precision.
Personal preference and taste must play a role for you to be satisfied so do some homework before buying. There are many great options. Anything from Thiel, B&W, Revel, and Paradigm Reference will also work great with your Mc. (I have first-hand experience with all of my recommendations.)
Be sure to post your thoughts about the sensitivity change.
Arthur