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Warming up for best performance.

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12 hours ago, STC said:

While it’s true that tube circuits benefit from “warming-up” (about an hour before serious listening, I’d say), I have never seen anything conclusive about solid state stuff. Depending on the design, some stuff might benefit (like amplifiers and possibly DACs - I leave my DAC on 24/7).


George

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18 minutes ago, gmgraves said:

While it’s true that tube circuits benefit from “warming-up” (about an hour before serious listening, I’d say), I have never seen anything conclusive about solid state stuff. Depending on the design, some stuff might benefit (like amplifiers and possibly DACs - I leave my DAC on 24/7).

Lab equipment manuals often state that calibration is valid only after a 15-minute warm-up.

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1 minute ago, Speedskater said:

There is a whole lot of difference between:

a] measurable in calibration equipment

b] audible in hi-fi equipment

I'm glad you pointed this out.  Once a device has reached the limits of the calibration gear it may take up to 200 more hours before it is no longer audible to audiophiles in a hifi system.  ;)


To paraphrase Rick James, "sighted listening is a helluva drug".

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5 hours ago, mansr said:

Lab equipment manuals often state that calibration is valid only after a 15-minute warm-up.

While that is interesting (and true), we aren’t measuring, we’re listening. Two different things. The level of accuracy required to measure something requires a perfectly stable circuit. Not sure if that level of stabilization is audible, but I suspect not.


George

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1 hour ago, KeenObserver said:

From what I understand, Benjamin D'Over recommends breaking in their USB cable for five years.

I hope you’re being facetious. The idea of “breaking-in” a cable is simply ludicrous in my opinion. It’s just WIRE for crissake! Maybe there’s a difference between different USB cables, and maybe there isn’t (I wouldn’t know, I only use USB audio for my desktop system, not in my main system). I’ve never heard any difference between any USB cable I have, and I’ve got them from AudioQuest, Kimber, Nordost, and a dozen generic ones from everywhere! They all sound worse than Optical or Coax SPDIF or balanced AES/EBU to me.


George

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1 hour ago, KeenObserver said:

From what I understand, Benjamin D'Over recommends breaking in their USB cable for five years.

 

Missed the significance of the name at first read...

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I have a BENCHMARK amp which I give 5 minutes to the amp and myself to warm up. At 67 I think my hearing varies a little each day usually depending on how many laps I did in the pool that morning. 

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1 hour ago, Michaelb4 said:

I have a BENCHMARK amp which I give 5 minutes to the amp and myself to warm up. At 67 I think my hearing varies a little each day usually depending on how many laps I did in the pool that morning. 

 

How do you like the Benchmark amp?

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2 hours ago, Michaelb4 said:

I have a BENCHMARK amp which I give 5 minutes to the amp and myself to warm up. At 67 I think my hearing varies a little each day usually depending on how many laps I did in the pool that morning. 

 

 Varying BP will do that. In my case , years ago I found that brisk walking lowered my BP considerably,( even a little too low on a few occasions,)  which resulted in my damaged hearing improving.


How a Digital Audio file sounds, or a Digital Video file looks, is governed to a large extent by the Power Supply area. All that Identical Checksums gives is the possibility of REGENERATING the file to close to that of the original file.

 

PROFILE UPDATED 18-06-2019

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20 hours ago, STC said:

ST

 I can relate to this, as similar happened to my Class A amplifier several years ago . They were building a new electrical substation 200 metres up the road for a new shopping centre mainly, when somebody must have hit a high voltage cable or similar, as the lights went VERY bright for  a short period too.

I hadn't got around to putting my power board with VDRs in it  back in line at the time just after moving there, but I doubt that it would have saved it as both transformers burned out .

 

Alex


How a Digital Audio file sounds, or a Digital Video file looks, is governed to a large extent by the Power Supply area. All that Identical Checksums gives is the possibility of REGENERATING the file to close to that of the original file.

 

PROFILE UPDATED 18-06-2019

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10 hours ago, gmgraves said:

While it’s true that tube circuits benefit from “warming-up” (about an hour before serious listening, I’d say), I have never seen anything conclusive about solid state stuff. Depending on the design, some stuff might benefit (like amplifiers and possibly DACs - I leave my DAC on 24/7).


Been there. Left all my equipment on 24/7 and at one time even the 350W on idle amp ( no standby) Amp 24/7. And now, I made a 180 degree turn and turn off everything including the electrostatics speakers power supply. Warming up is now limited to just a few minutes. 

 

1 hour ago, sandyk said:

ST

 I can relate to this, as similar happened to my Class A amplifier several years ago . They were building a new electrical substation 200 metres up the road for a new shopping centre mainly, when somebody must have hit a high voltage cable or similar, as the lights went VERY bright for  a short period too.

I hadn't got around to putting my power board with VDRs in it  back in line at the time just after moving there, but I doubt that it would have saved it as both transformers burned out .

 

Alex


It was funny. All looked fine till it started to smoke after 20 minutes of play. Power caps failed. 

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1 hour ago, sandyk said:

 

 Varying BP will do that. In my case , years ago I found that brisk walking lowered my BP considerably,( even a little too low on a few occasions,)  which resulted in my damaged hearing improving.


That is an interesting observation. My usual BP is 70/100 and goes up to 80/112 sometimes. Wonder if that makes a difference?

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2 minutes ago, STC said:


That is an interesting observation. My usual BP is 70/100 and goes up to 80/112 sometimes. Wonder if that makes a difference?

 Not likely. My BP is often closer to 150. When it is in that area or a little higher my hearing further degrades .

Around 130 appears to be better for me.


How a Digital Audio file sounds, or a Digital Video file looks, is governed to a large extent by the Power Supply area. All that Identical Checksums gives is the possibility of REGENERATING the file to close to that of the original file.

 

PROFILE UPDATED 18-06-2019

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Unfortunately, warming up is a bit part of achieving the SQ I chase. On switch on from cold, the quality can be pretty dreadful, to my ears, and it will requires hours of solid conditioning of everything, especially the speaker drivers, until decent performance is reached.

 

This is a very big part of why it's so difficult to "present it on a platter" - there's an excellent chance that one, tiny little thing has not stabilised enough, or conversely, that some area of the system has degraded in that time frame, for some stupid reason, while waiting for everything else "to be right" - so, for that session, "I ain't got nothing!" ... 🙄.

 

The real engineering challenge is to ensure that one can state quite emphatically that given a certain sequence of warming up procedures, and that within a sensible time frame - minutes, not hours, days, etc, etc - that the SQ is at an acceptable level. Anything else is an admission of failure, as far as I'm concerned - if you're trying to do commercial product. Which is why I'm still experimenting ... 😉.


Frank

 

http://artofaudioconjuring.blogspot.com/

 

 

Ahhh, Mankind ... Porsche intellect, Trabant emotions ...

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the brain should be kept warm too & will either benefit or detriment* from warming up periods with familiar source material

 

 

 

* I am thinking about 'edge detection' here


"The overwhelming majority [of audiophiles] have very little knowledge, if any, about the most basic principles and operating characteristics of audio equipment. They often base their purchasing decisions on hearsay, and the preaching of media sages. Unfortunately, because of commercial considerations, much information is rooted in increasing revenue, not in assisting the audiophile. It seems as if the only requirements for becoming an "authority" in the world of audio is a keyboard."

-- Bruce Rozenblit of Transcendent Sound

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26 minutes ago, Ralf11 said:

the brain should be kept warm too & will either benefit or detriment* from warming up periods with familiar source material

 

* I am thinking about 'edge detection' here

 

Edge detection* can be very painful and happens more frequently when the brain is not warmed up

 

* I'm thinking about walls and furniture here

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Good point - robots have a hard time moving around in complex environments too


"The overwhelming majority [of audiophiles] have very little knowledge, if any, about the most basic principles and operating characteristics of audio equipment. They often base their purchasing decisions on hearsay, and the preaching of media sages. Unfortunately, because of commercial considerations, much information is rooted in increasing revenue, not in assisting the audiophile. It seems as if the only requirements for becoming an "authority" in the world of audio is a keyboard."

-- Bruce Rozenblit of Transcendent Sound

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My pre-amp never goes off. The "off" switch detaches the inputs and leaves the rest of the circuits powered. It was designed this way.

 

The power amps, when off, are still fed a trickle current.

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