Not at all. They are superb with jazz, electronica, techno etc. So much faster than typical box speakers with none of the artificial dryness of over-damped amps and aggressive port-loading. They aren’t the right tool for ear-damage, so those wanting a heavy metal concert in their front room should look elsewhere, but neither valve amps or ESLs are in any way genre-specific. I‘d actually argue if a system can really do classical well it can do anything well. So many systems fail when shown a piano, let alone anything bigger!