Quote:
Originally Posted by Filburt
Well, headphones are also highly mechanical and subject to significant hysteresis, so it's reasonable to expect them to change over time as well. I've yet to see even a plausible account for why solid state amplifiers would be subject to hysteresis over the relatively small service life (relative to rated, stable performance of the components) they typically enjoy with their owners here. However, psychological acclimation still has an impact on the subjective experience, often in a positive fashion (e.g. the equipment's subjective performance improves as one acclimates).
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Not sure if this falls under the umbrella of your discussion, but "burn in" does not always result in positive results, so that a blanket statement that psychological acclimation is a significant (if not pervasive) reason for "growing to like" the sound of a piece of equipment would seem to fail in at least some instances.
Speaking only from personal experience, I've tested a number of amps, with varying results. In some cases an initial sparkle and zip softened and faded; in other cases as big/round bass developed, the high frequencies softened and became significantly rolled off and ill-defined; one version had large Panasonic caps that started with great speed, punch and detail and reasonably good HF extension, but with increasing play time the sound stage got narrower, the sound generally "congested" and noisy, and it became more unpleasant until it reached a plateau and retained all the unpleasant characteristics -- basically failing in its application.
With some amps, especially with larger Black Gate caps, there have been "landmarks" as the sound developed, some of these points revealing sudden improvements in certain areas (low bass, sound stage width or depth...), and at some points the SQ seemed to deteriorate for a short while, until at one late point the highs became clean and clear, and accordingly spatiality, ambience retrieval/recreation, timbre, dimension, definition, etc., all improved significantly and stayed there.
I'm sure that brief changes in perception must be fairly common with changes in physical states, stress levels, etc., but finite, exacting and describable characteristics as relate to instruments and performers in recordings that can be heard and described in like fashion on repeated occasions with a "burned in" and well-enjoyed amp, for example, would not seem to be resulting from acclimatization. The same could be true for headphones as well as amps.
My experience with K701 falls into this discussion as well, since along the way to stabilizing, I heard all sorts of anomalies, interesting effects, and frequent disappointments relative to my expectations and to what I consider superior headphone performance. After I had almost given up on them, and another few dozen hours of intermittent play with only casual attention paid to them, the deficiencies that had discouraged me from listening to them cleared up. Specifically, imaging, position/placement of performers, timbre/shape/volume of instruments and voices, stable sound space dimensions and boundaries, stable LF reproduction - and some more that I can't recall in a hurry -- all improved noticeably. The 701s lost what I felt early on was a sort of "holographic-but-echoey" presentation.
This well-played pair of 701s seem to hold their focus and specificity of positioning of performers every time I check them, half-expecting them to devolve into the weird sound I heard until well past 300 hours. When my friend lent them to me he said he had logged about 270 hours, and expected "that should be enough". I did not log my play time with them carefully, but I'd guess 350+ hours marked the turning point for me, when I felt they had matured and stabilized.
I certainly agree with you that there may likely be many cases where pschological acclimation -- or perhaps other psychological factors -- will result in an end-user enjoying the sound after an extended period of listening, or at least of ownership -- just not all (or nearly all) the time.
Sorry for blabbing, but I wanted to related a bit of this before I finish my work and head home (yeow!!!).
Cheers.