I have done some reading around, and heard the T1 is a "musical" headphone, even more than the HD800. Would anyone agree with that?
That's because HD800 is one of the most analytical, less fun, less forgiving headphones on Earth.
T1 is not 100% 'musical' in the sense that it's still a very detailed, neutralish, sharp sounding headphone.
But next to the T1, the HD800 sounds like a tool. HD800 is brighter, cooler and drier.
What I mean is, don't think the T1 is musical because it's more musical than HD800.
Most headphones are more musical than HD800.
I have to analyze that continuum!
Some would argue that with the right amp, the HD800 is very musical, so it all depends.
It's a simplification for sure, take it with a grain of salt.
The musical term is one of the most infamous around. The thing is that HD800 is almost too light in the bass, extremely neutral in the midrange, soft upper midrange, definitely bright 6kHz, airy top and extremely wide soundstage. That's its nature, if you like that kind of sound and use it mostly with top class recordings, then you can find it musical for sure. (I'm in that boat most of the times, listening to those recordings where analytical an musical can coexist). But in the big scheme of things, it's definitely an analytical headphone, so anaytical that plenty of people keep modding it, so much that they (sort of) forced Sennheiser to bring the HD800S (less analytical, more musical version of the exact same headphone).
Some would still argue, sure, but sometimes the 'right amp' is a very coloured one, or one with really high output impedance (which means coloured as well), or an amp with high levels of some paticular types of distortion. I'm not against those amplifiers if the person ends up enjoying the result and I'm not against EQing with a quality parametric equalizer, but I normally prefer to jugde headphones using neutral solidstate amplifier and no EQ.