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CMoy burn in time, if necessary

post #1 of 14
4/13/07 at 2:35pm
Thread Starter 
I've heard reference to, but never found a topic, of burn in times for the CMoy.

Is it necessary? If it is, for how long?
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post #2 of 14
4/13/07 at 3:01pm
Unlikely. While I know amp 'burn-in' is a popular phenomenon on Head-fi, I've yet to see anything in the way of a real argument for why it would exist either than the placebotic effects of psycho/physiological acclimation to the device. The subjective response to a consistent physical stimulus can change rather substantially over time, at different times, so it's wholly unsurprising to see many people finding that something will sound different with time. I'm not saying all burn-in is false; headphone drivers are much more subject to measureable and audible effects of hysteresis. The degree of change that would be involved to produce particularly audible effects would mean such substantial drift in performance in the components you're using in your CMoy that, should you experience such 'burn-in', I imagine each part's respective manufacturer would certainly like to know that the part is so substantially deviating from its specifications. I've yet to be able to measure or hear anything even resembling 'burn-in' with anything I've ever built (and some of those circuits were substantially similar to some amps that allegedly needed to be burned in). In certain circumstances, if your amp is on the edge of stability, intervening environmental factors may impact the performance in a significant fashion, but a decent layout and proper bypassing should be able to largely prevent that.
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post #3 of 14
4/13/07 at 3:07pm
Thread Starter 
Thanks Filburt... sounds like burn-in is the same as pc building... subjective.

In terms of components working at first turn on, either they work or don't.

If I was going to give some CMoy's away to friends and such, I guess running them for a short period of time would ease my mind knowing that they were put through some sort of test.
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post #4 of 14
4/13/07 at 3:36pm
Quote:
Originally Posted by BlizzofOZ View Post
Thanks Filburt... sounds like burn-in is the same as pc building... subjective.

In terms of components working at first turn on, either they work or don't.

If I was going to give some CMoy's away to friends and such, I guess running them for a short period of time would ease my mind knowing that they were put through some sort of test.
It's not a bad idea to test your stuff before you send it out. I'd definitely encourage you to include power supply bypassing if you haven't already. That is, having small value caps between each rail input and ground to give transient response. It will improve the stability of your amp and help maintain stable performance.
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post #5 of 14
4/13/07 at 4:01pm
It is just like headphone burn in. I swear by it but it has its skeptics. Anyways, as for amps some people state that capacitors will burn in but I have yet to hear a difference with any amount of time spent on my amp.
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post #6 of 14
4/13/07 at 4:33pm
I've got terrible skills, so I always test mine. Of course that just means I leave them on for an hour or 2 and run the meter over them.
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post #7 of 14
4/13/07 at 4:36pm
Quote:
Originally Posted by mminutel View Post
It is just like headphone burn in. I swear by it but it has its skeptics. Anyways, as for amps some people state that capacitors will burn in but I have yet to hear a difference with any amount of time spent on my amp.
Amp 'burn in' _is not_ 'just like headphone burn in'. Headphones rely on a mechanical device (the driver) that is highly suceptible to hysteresis in a manner not analogous in the components of the CMoy.
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post #8 of 14
4/13/07 at 5:44pm
The first few hours of use the caps may form better by merely having voltage on them, it wouldn't have to be playing music nor driving cans. It is not going to make/break an amp, not any kind of requirement as it'll happen anyway in use.

The better test would be borrowing your friends cans or similar impedance, efficiency and finding out if the CMOY can drive them successfully, as it will have a lot of trouble at moderate to higher volume with many typical 32 Ohm portable cans.
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post #9 of 14
4/13/07 at 6:19pm
depends. If you like how it sounds, you won't need any burn-in. If you don't like how it sounds, you'll need quite a bit of burn-in ('til your brain finally agrees to like the cmoy that you just spent x days working on)

This is just a theory, but I've noticed that the headphones I own which supposedly have long "burn-in" times sound like crap, and those which don't have any really sound great. My Shure E4s are honestly my favorite 'phones, and IEMs supposedly have no burn-in. My AKG701s and HD280s sound boring compared to the IEMs, despite how much more the AKGs cost, and they both supposedly have incredibly long burn-in times. Of course, I can't really prove this, considering that I myself am not completely objective.

Burn-in and a lot of other stuff in audio gets pretty weird if you think too much about it. Personally, I don't think much more about them anymore--if I like what I hear, then it's all good.
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post #10 of 14
4/13/07 at 6:56pm
As Filburt mentioned, cans' mechanical driver break-in, which could be called a burn-in, is a separate, unrelated issue to amp burn-in. Nothing can be drawn for one by observing the other.
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post #11 of 14
4/13/07 at 8:50pm
Quote:
Originally Posted by Filburt View Post
Amp 'burn in' _is not_ 'just like headphone burn in'. Headphones rely on a mechanical device (the driver) that is highly suceptible to hysteresis in a manner not analogous in the components of the CMoy.
I was just making a reference as to how some people are skeptic about headphone burn in just as some people are skeptical about amp burn in. I was not directly comparing them just trying an analogy. I know the solid theory behind driver burn in, but I was merely referring to skepticism and what people think.
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post #12 of 14
9/9/11 at 12:37am

Well, I bought an CmoyBB v 2.3 when it arrived it sounded great, after lets say 4-5 hours it sounded crap and remained to sound crap untill like 70 hours.

Now after 70+ hours it sounds much better to me more musical detailed even with the crappy stock muddy opa2227p opamp.

 

Need to change that crap opamp soon. 

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post #13 of 14
9/9/11 at 4:41pm

The OPA2227 is not crap. :)

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post #14 of 14
9/10/11 at 9:17am

"the crappy stock muddy opa2227p opamp "

 Then try the OPA-27 or opa-37, they sounds more natural, i built my CMOY HA with it,

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