Yes. It was in my case, I used Dayton 1% on the 4, 8 and 24uf caps and 5% on the 40 and 100uf caps. The 1% is a different cap than the 5%; not just a tolerance difference. I found the 91s would get 'under my skin' and become un-listenable quickly. I did one speaker and put a 0.01uf Dayton film and foil across the 4uf and a 0.01uF Vishay 1837 across the 25uf (24). I did an AB of the 2 speakers. I wasn't sure what was different at first as the bypassed speaker seemed to be not as loud. I finally got down of the floor and and put my ear to the tweeters and mid of each speaker. It became quite clear then. The NON bypassed speaker had brightness and glare. The bypassed speaker was clearer and more detailed. I can now listen to them all day without getting listener fatigue.
I'll be putting bypass caps across all the caps in my AR90 project.