I had a 2505. Any speaker I ran with it was fine. Just pick the power tap closest to the ohms required. If in dought, always err to the low side. A 2505 will have NO problem with 4 ohm speakers. I even used it with some that dipped to 2 ohms in the bass range. Remember, you are dealing with a McIntosh! They can take it!!
p.s. You can get a nice used pair of Paradigm Studio 60s V2 for under a grand that work very well with McIntosh gear.
p.s. You can get a nice used pair of Paradigm Studio 60s V2 for under a grand that work very well with McIntosh gear.