Why that impression, since I average one classical concert every week to ten days at the Barbican, royal festival hall, etc, and use mussorgsky pictures, schehrezade, Bach chorals for audition, and I have never heard bass, speed and slam on classical (Gnomus, for example), replicated on anything like a Lampi. Not to mention spaciousness ahs soundstage. Would be a mistake if you dismiss it as a strawman valve component that eats details. In fact it is hyper detailed. 101ds are best for orchestral, I like 6a3s for opera.
You need the 7 though, 5 will have less details and is not ideal for complex music. 7 is a different design and animal