If they are 90’s vintage McIntosh, my guess would be that the woofers need to be refoamed or reconed. This is a common issue for many different speakers from the 90’s. Do they have removable front grills? If so, visually inspect to see if the foam surround is deteriorating. Also, gently push in on the center of the woofers to see if you hear a rubbing sound. This sound indicates they need a recone. If no sound, then they may just need a refoam. Not knowing the model, 2 way or 3 way, and if they are 3 way, the midrange may have the same problem. Just do a Google search for speaker repair in Hawaii.
speaker distortion
my son in Hawaii got a pair of McIntosh speakers recently. I think it's a 1990's model which listed for like maybe 5k. I don't know the model number but when he hooked it up he said they don't sound good. he mentioned that the sound has distortion. is there anyone out there who might know what the problem is??