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Originally Posted by oqvist /img/forum/go_quote.gif
Great review... How is the Caliente for sibilance? Also what is the better match for it the 650 or 600? I can get both at about the same price but not sure if this amp is good enough to make the 650 better than the 600?
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I have not noticed sibilance - not even from tracks or parts of tracks in which "s"es are really being hissed out prominently by the singer/speaker. The hiss of the s comes out as prominently as the singer/speaker prounounces it, but without any of the detectable harshness of sibilance, to my ears.
".. but not sure if this amp is good enough to make the 650 better than the 600?"
The Caliente is a sufficiently competent amp to bring out the strengths of each of HD600 and HD650 phones. The HD600 bring out the treble range more and the bass range less than the HD650 - yet the HD650 reveal more detail across the acoustic spectrum. Both have a rich, full midrange - the HD650 more rich and full (to my ears) because of the overall lower illumination level of the sound. Yet, both sound great with a Caliente - and which is deemed better will depend on the recording/production qualities of the track and the listener's preferences. As an example, the sounds which define the "ambience" of a live venue are more pronounced on the HD600, as I hear it. Those same "ambient" cues are very much there with the HD650 - in even more subtle detail, to my ears - but not as prominent in the overall mix as with the HD600. For me, the HD650 is what I generally enjoy more for my listening, and the Caliente lets it show its sonic display strengths to an extent which keeps the music lover in me richly satisfied and my ears deeply engaged and happy.
Depending on which flavor of sonic display strengths is more sought to most enjoy a particular track, the Caliente enables either of the HD600 or HD650 to perform according to their respective strengths - being well-supplied from the Caliente with the voltage swings and current-on-demand that each needs to do what each phone does best.
Most of the time, my particular listening preferences and goals are best satisfied using the HD650. Whenever I have used the HD600 with the Caliente, though, what I hear sounds so much better than when I had used the HD600 with any other amp in my past, that, while I listen, I mentally re-evaluate the HD600 relative to the HD650. I still own both, and, while I mainly use the HD650, I have no plans to sell off the HD600 in the foreseeable future - it is a valued member of my collection of musical listening instruments.
I've already posted in this thread the other amps that I've used with the HD600 and HD650. I prefer what I hear from the pairing of these phones with the Caliente a good measure more than with any of the other amps in my past.