Hi Joe90,
I installed the resistors labelled "7W1R8", which are 1.8 ohms, on both pairs of tweeters in my M80ti's. These provide a slight attenuation of tweeter output. The resistors that impose greater attenuation are labelled "7W4R1", which are 4.1 ohms. I haven't tried those because the 1.8-ohm resistors were enough.
When I instantaneously A/B'd the M80s with the M22ti's (no resistors installed) on the same program material, there seemed to be no reduction of "air", "space", or imaging.
What I did notice was that on jazz selections with well-recorded percussion, the brushed cymbals on the M22ti's had a little more "ring" to them than on the M80s. The cymbals on the latter were slightly muted. Overall, I was pleased with the tonal balance on the M80s after installing the resistors but I use them in a smallish room, so they may not need them in a bigger room.
Regards,
