- Feb 1, 2009
What's interesting is the article I linked precisely uses the HD650 cable as an example, and the only major variance was one channel of one of the two stock cables. The other stock cable essentially matched the others.
Would it be safe to assume that the larger the source impedance, the less relevant a cable is?
yeah, I've actually talked to Tyll about those very measurements, and like he says in the article, he's not sure if those are the measurements that would show differences in the cables if they did exist. He said he picked the HD600 cable, because, like with me, that is tha stock cable that he hears the largest (though still subtle) difference when switching cables. Dynamicism and impulse response (as defined in Tyll's measurements) aren't exactly the same thing (though are very much intertwined). Dynamicism has to do with how impulse response varies at different loads, rather than a single characteristic load (which is what Tyll measures). A headphone having a similar impulse response to different frequencies at different power levels is what really characterizes a very dynamic headphone/amplifier/cable system.
Two things can impact a cable/headphone's perceived dynamicism:
1) a lot of ringing in the impulse response. The HD600 never really had this problem, to my ears, and that's borne out with Tyll's graphs.
2) different impulse responses for different power loads. This is something that isn't currently measured by Tyll. To me, this is what brings out micro-detail, that a DAC/amp/cable/headphone system delivers a similar impulse type response across both axes of the frequency/power 2D plot. If a system jumps hard at a certain high power level, but is more sluggish at lower power levels, especially in very dynamic passages, micro detail is lost and/or smoothed over. As Doug from ECP likes to often state, "micro-detail resides in the first milliwatt." This is also where small differences in differential resistance can become much bigger deals. Although obviously subtle, this is often the difference in the last little bit of transparency.