Thank you for clarifying. I understand about extension of both ends of frequency range, but that’s only one thing.
It’s hard for me to explain it in English, but I will try
With symphonic music (Mahler No2 for example) there are moments when whole orchestra is playing (it’s called tutti). Such moments become a real test for the amplifier. With a great amplifier these moments are played without loss of separation. You hear the whole grandiose event, but you still perfectly understand that it consists of individual instruments that are still perfectly played. In my opinion, maintaining separation in the most difficult moments of the recording is one of the things that distinguishes a good or “ok” amplifier from a great one.
I never heard really high-end tube amplifiers in my system side by side with Headtrip, but simple and not very powerful SET (not ampsandsound) absolutely was not able to do this. It produced really nice tone and image during solo passages, but tutti was a mess - amplifier was not able to maintain that holographic separated imaging during complex passages. It did not unfold the stage in proportion to its full width at such a moment, but rather shrink the orchestra to a smaller size, losing the individuality of the instruments and the space between them.
Since then I started thinking that this kind of separation and polyphony is not possible with normal tube headphone amps, only balanced (like WA33) or insanely powerful (like 845 Egoista). Am I wrong and Nautilus will have no problem maintaining imaging and separation while playing complex orchestral passages?
P.S. By the way, have somebody compared Nautilus to more common TOTL amplifiers like WA33?