which excels at Rock and Roll

I've heard and owned many speakers. 

The best I have heard for rock, even metal music, have been Dynaudio and Usher.

Mangepan Tympani were also very good.

Have you ever listened to a pair of JBL L100 Classics ? 
They excel at rock and roll and can provide long listening sessions without having any fatigue. 

I had, repaired and sold a pair of L100s. They didnt excel at anything. 

"African Jimi Hendrix" made me laugh.

I have 4 full range speakers currently. The speakers with the cleanest, most notable resolution are my least favorite to listen to loud. High sensitivity or some glorious amps paired to speakers with slightly forgiving tweeters. Dynaudio's boogie, KEF's with the right amps, Klipsch, although I find them a bit hot, and believe it or not those old Bose 901 VI hanging from the ceiling have me jumping around the room like a literal idiot. So many speakers, so little money.

I had a lot of fun with beer, led zep, rush...and Cerwin Vega

Merlin Vegas have a gut punch that really energizes hard rock.