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I'm not saying there aren't other important characteristics of a DAP (THD+N, timing/phase, IMD, RFI, etc.), but FR is the be all and end all if we're talking about brightness of a sound signature. A FR sweep would trigger harmonics in the exact same way if the final output was to your ears rather than to the sound card.No no, 2 amps can have the exact same "flatness", but that doesn't necessarily mean that they'll sound exactly the same. FR isn't the be all and end all of measurements. All 3 of the tube settings on the iTube2 give the exact same frequency response, but each one does have its own character (objectively it's obviously not a "night and day" difference as some may claim)
we're getting a bit off-topic for this thread, so if you wanna explore this further, head on over to https://www.youtube.com/user/samma3afans/videos and check out the follow up vid i did for the iTube2, there's I've got a few sound demos to compare the sounds (and no, my funky sound card wasn't used for this lol)
I suspect a large part of any perceived differences in FR are attributable to 1) change in headphone FR with changing z-out 2) reviewer necessity - what else are we going to write about in our reviews if they all sound the same?
As you say, we're probably getting OT and boring most other people on this thread, so I'll drop it here and maybe we can continue via pm?