Your question is rather vague so here is some basic information. I don't know the speakers so I looked them up. They pose no special problems and are an easy load to drive. I do know the ML very well. The 26s is still a world class pre. If it has the balanced board, definitely use balanced cables to the 23.5. The 23.5 will drive most any speaker ever made and is an extremely powerful and stable amp. If you have more specific questions I will try to answer. I still own a 26s and have used a 23.5.
Denny
Denny