AlanHell, how are they different? And in your opinion, do the differences between them justufy having both?
Have not heard the HD800 so I'm a little curious.
Well, the difference is person to person, amp to amp, DAC to DAC, CD to CD. So I cannot say for sure what contributes more to the sound. (Even with the exact same gear, someone may argue that they hear sonic difference due to different power filter and cabling.)
In general, I would just say that the following comment is only for me and my amp collections with my music only.
The treble of the T1 is a bit more emphasized compare to HD800. This results more harsh sibilance for some lower resolution recordings. It also gives the T1 a wider sound as if you are sitting farther away from the sound source. In a more linear amp like RPX-35, the treble energy is much higher for the T1 while on the HDVD800 with balance setup, it settles down a bit with more pouch on the bass.
The mid is where I found the most differences. HD800 sounds more forward compare to T1. Like what I said before, HD800 makes you feel like you are sitting right in the middle of the theater, T1 is the guy sitting 3 rows behind it. As for the imaging ability, they have different approaches. HD800 present the sound in a more concrete manner while there are 2 or 3 clouds of sounds, and in each cloud you can tell what instruments are in by the layering of the sound. Each sound will be presented and overlay with each other. For T1, you will have more clouds of sounds. It like every instrument has its own sound space and they tend to stay that way. You can tell the difference of the instrument by the location of the sound and they tend not to come across each other. So, to me HD800 is more engaging while T1 is more lay back. With different recordings, it will give you completely different feeling about the music. For instance, with a live rock recoding, HD800 gives you a feeling that you are the lead singer singing your favorite piece; while T1 makes you the super high hardcore fans cheering for your idols. Depends on the mood, I could take both~~~~
The low end is like the treble, very similar. I think because both of them are German, so they need more controls and speeds over quantities. I think HD800 slams deeper while T1 slams harder. So, there is more mid bass on T1 and more extension on the HD800. If you give them the proper power with balance connections, they can both rock your head hard. Both of them, to me, have excellent bass body and textures. You can feel the vibration of the drum surface while they are making those sounds. But, in a smaller space, I like the HD800 bass more since it is closer and more immediate. While for a rock show, T1 provides more rhythms without affecting the sound of bass guitar. For the most of pop music, you will find them "bass light" . Since I rarely uses then for pop, I do not have that problem.
Hope this helps your curiosity~~~~~
One thing I learn from past years is that:
never get too curious, or your wallet will hurt, big time!
Cheers