I & a few others went back & forth in this thread some weeks ago about exactly how "warm" the V281 is. To summarize:
- My feeling is that the slight "warmth" of the V281 is not because it makes everything sound "warm" (it definitely does not)--but more because it lacks the overly clinical/"revealing" upper midrange & treble of so many amps mentioned on Head-Fi.
- Let's just say there's is a wide opinion/perception gulf (in headphone audio, as well as big living room system "audiophile" audio) between those that want accuracy/revealing/details vs those (like me) who want organic/musical/natural/relaxing.
- The V281 is probably more in the latter camp, but not by much--it also has tons of resolution...no details are MIA w/this amp
- A related perception is two other impressive strengths of the V281--tremendously impactful/deep bass; and state-of-the-art dynamics--tend to really anchor the low registers in a way I find quite natural, like real, life music. This, in turn, tends to take the spotlight off upper midrange & treble. So indirectly, the V281 seems less centered on treble because you have so much to listen to in the lower registers, as well the upper ones.
I have the V281, know it extremely well, and have zero difficulty recommending it to just about anyone w/any type of hardware. It is enormously flexible and has tremendous power (can drive any headphone)--while sounding very good, indeed.
For comparison, I also have (and just love) the Liquid Carbon--which really is a warm amp. But even there, calling it "warm" (implying it "filters" everything & imposes a fixed sound signature on everything) doesn't begin to describe what it can do.
ie, "warm" is kind of curse here, at least w/some. but it's often not a simple thing IMO.