Good Speakers for Rock and Roll Under 15K

I don’t think you need to chase amps, good is good enough IMO. Just get the speakers right. Dynamics/transients is the key to good rock. Just use enough power to keep your dynamics designed into the speaker.

A smooth downward sloping frequency response in room (Revel, JBL, Kef, etc) helps so bad recordings don’t bite your head off. Speakers that are flatter in room (thiel, B&W, a few I have owned) are far less enjoyable with rock.

Have you considered used equipment? Where are you at as location has a lot to do with availability and pricing?  For $15K, you could do very well in the used market for dynamite speakers AND the equipment to run them.

I agree with a tube pre and SS amp.

I also agree with horn speakers. I have a pair of Volti that I enjoy with all types of music. JBL are nice, although never had opportunity to spend any length of time with them. I guy I know in my area has a set of Rethm Saadhana he is selling for a fair price on another audio site in the US. They are also very nice and I have often spent time listening to then in his system. I dont really ever see Volti on sale used, but a new pair of Rivals are only slightly above your price. Good luck on your journey

Pioneer HPM-100 speakers are suitable for many genres of music.  They sound great with The Who, Black Sabbath, Kraftwerk, Public Enemy, Ry Cooder, classical, etc.