Mine does the same, whenever it happens I use a demagnitizer disc and its cured.
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You might consider that your hearing changes day to day, and throughout the day. It is likely not your equipment at all, but you. Humidity levels, exposure to other noise, barometric pressure all affect your hearing.
Dirty power could also be the culprit, although you would likely hear differences more frequently, or at different times of the day if that were the case.
10-13-11: MeiwanGreat post Meiwan, I agree 100%.
this has come up before with no final resolution agreed upon.
fwiw I have experienced the same thing and can not pin point it to anything specific wheather it be humidity, my mood, power quality, time of day (except after 11 PM).
The only obvious difference for me is after about 11 PM the sound is better and I am sure that is because my neighbors are using less power but that is not what this post is about.
We are not machines so we certainly do not perform equally well at anything every day, including focus and hearing.
Consistency of source power and operation of any of our devices together day to day is always suspect but its hard to take the human factors out of the equation with things like this so I would look there first.
Look for patterns regarding what might be different on a consistent basis when these things happen and be sure to take your own mood and status into account.
I recently bought a Hi-Fi Choice magazine with a free System Set-Up disc. It's pretty entertaining, especially the soundstage tests...and it has a burn-in track with demagnetisation which I DO NOT understand...how can playing a digital track on a system demagnetize it? This will be added to the 12,416 things I don't understand, unless somebody can explain it to me.
"I would describe it as a slight lack of focus and dynamics.* This has happened through many changes of all components."
I've had similar issue in the past. Check your incoming ac voltage, usually a drop would result as such*. Whereas, an increase could have it sounding too controlled and pinched. Get a power conditioner incorporating stabilizer, or, if separately, a good stabilizer along with your conditioner. I've learnt it's not so much about ac quality in this case, but more likely the irregularities of it being the culprit.
If I am extremely stressed or fatigued, my system just doesn't sound right - as you describe unfocused with flat dynamics. Over several years, I'd experienced this with frustrating irregularity. Then I discovered that when I ingest a B-complex multivitamin the night before, my system always sound oh so right, glorious, the following evening. I have reproduced this phenomenon enough times that I cam convinced of the causality. From a medical standpoint (I am a physician) a logical explanation can be made, having to do with neurotransmitter depletion and general neuronal fatigue. As an aside,I have completely foresworn any alcohol in my diet for 5 years now; for me, alcohol consistently smears and thoroughly ruins the critical listening experience, even in small doses.
Rok2id...from earlier in the thread: "I recently bought a Hi-Fi Choice magazine with a free System Set-Up disc." That's how. I'm here to help.
I have to warn the doctor that by "foreswearing alcohol" the girls will not get prettier at closing time, and telling 'em you're into B vitamins...well...that just never works.
An interesting subject and I'm sure it is a true observation. I am not convinced it is physiological, I'm a physician too. Some days, you turn the system on and it just is'nt firing on all cylinders and yes, I do give it time to warm up. I am not one of the leave it on all the time, believers.
I am not ware it is connected to how I feel, tiredness, anxiety levels. I have a pretty good power supply, with a Pure power regenerator. So I can not explain it, but I agree with Mike60's observation.
Emotion, ear wax, humidity, lack of humidity, lack of emotion and ear wax...if things were experienced in a state of static sameness we'd all go insane from boredom. We experience the differences between things like light/dark/loud/soft/feel good/feel bad and if it were up to "big pharma" it would all be one large bowl of bland soup. I play guitar much better on some days...I don't think it's the guitar's fault.