Stereo warmup? Myth or fact
Posted 16 June 2012 - 11:06 PM
Do subwoofers need to be warmed up to perform at optimum / prevent damage, or not? Afterall they are a mechanical device, so are susceptible to stresses (both thermal and mechanical).
Are we shortening the lifespan of our VC motor suspension by going to Vol:11 from cold? Or am I getting paranoid because i've spent the last 4 hours covered in grease and oil?
Posted 16 June 2012 - 11:15 PM
Unless the speakers freeze over I don't see any damage possible.
Posted 16 June 2012 - 11:17 PM
Unless we are talking extreme cold.
From a sq point of view i think full range speakers sound better once warmed up.
The same with amps,tube amps maybe even more important.
Mine you the difference is small.
Posted 16 June 2012 - 11:39 PM
I image glue would be more brittle when cold and bits wouldn't flex like they would when warm so I'd say it would make a difference.
Posted 17 June 2012 - 11:27 AM
Warmup is important, as we all find out from time to time in competition.
Posted 17 June 2012 - 05:15 PM
I certainly notice a lack of low end from my midbasses on very cold mornings, which only goes away after blasting the heater for 20-30mins. I can't say i've noticed any difference on exceptionally hot days.
Posted 17 June 2012 - 08:39 PM
Edited by bobo333, 17 June 2012 - 08:39 PM.
Posted 17 June 2012 - 11:06 PM
this is all for SQ though, for SPL you want coils (and amps) as cold as possible
The same as a Dyno for a car. Colder engines make more power, but the cost is potential irreversible damage. While I understand the electronic side of things, the subwoofers as a mechanical device still have me skeptical (from a longevity perspective). After a crap day at work, I still give them a 5 minute "grace period" before I massage myself back to happiness.
Interesting with respect to SQ though, i'd like to see it in person someday
Posted 18 June 2012 - 06:12 PM
Posted 18 June 2012 - 06:35 PM
Posted 18 June 2012 - 06:47 PM
Posted 18 June 2012 - 07:58 PM
Posted 18 June 2012 - 09:05 PM
The variance in a woofer's mechanical properties between ~5 degrees and ~50 degrees isn't likely to be much more than the difference between some woofers brand new versus ~200 hours of play time. There are always variations, but in my opinion there's no reason to worry about mechanical failure within normal in-car temperatures, I guess you could say between 0 and 70 degrees C. I have had some woofers fail in heat, but that's while they were not being used (in-car.) So if they'll fail, they'll probably fail anyway.
The difference in sound from an SQ perspective in-car with temperature changes is probably more to do with the car's structure and the air in it than the drivers themselves, too.
Posted 19 June 2012 - 02:38 AM
Someone obviously got bored with the Charger forums
Posted 19 June 2012 - 08:09 AM
Tweeters can also experience a small difference in sound between temperature extremes.
Posted 19 June 2012 - 10:28 AM
I'd suggest the latter. When I used to bump in rigs if we were doing an outside festival or a festival in a big shed you'd d*** around for hours on end during the day trying to get things to sound 'right'. But as soon as the sun went to bed and that temp dropped and I guess a bit of moisture in the air it was like someone removed something from between you and the speakers and everything just opened up. Now I know that by this point in time the motors are fricken hot so the only change really is that of the air temp.
Posted 19 June 2012 - 10:32 AM
I would guess that it has more to do with the environment, than the operating temperature of the equipment (though HOT amps are never a good thing).
Though 'logic' is telling me that warm rubber surrounds and warm spiders are going to move more 'freely' than cold ones...
Posted 19 June 2012 - 01:29 PM
Certainly not enough that it would make a difference to the life expectancy of the speaker either.
Posted 19 June 2012 - 01:43 PM
Posted 20 June 2012 - 04:19 PM
It could be uncomfortably cold, to the point where it draws attention away from the stereo, so you may miss finer details, or not enjoy it as much, due to being too cold. Or you may notice more things, as some people concentrate better when its cold, the mind notices more things.
You could be angsty as its a cold morning and the kids or wife or someone is complaining, about it. You had a coffee to warm up, and you are a bit jittery. Had one too many wines last night in an effort to try and get some sleep, you dont notice it, but it affects your perception slightly the next morning during the drive to work and you think your favourite track sounds a bit off...
Or it could be slightly too hot, your mind wanders, you get a bit sleepy, you may enjoy this more, be almost slightly dazed? Or the heat could be something you dont enjoy, and so you judge the sound slightly harder then you normally do.
You may be dreading getting to work, where temperatures are unbearable, and its playing on your mind somewhat. Get in the car and burn your hand on the steering wheel, fingers are a bit sore for the drive home, and something just sounds a bit fuzzy in "Still Haven't Found What I'm Looking For" or maybe its that slight head cold...
I think how it is all reacting with the environment, and how the environment and you are reacting together have a bit more to do with it..
But those are just some cold wintery day thoughts of mine
Posted 30 June 2012 - 04:24 PM
And I'd put it down to gear more than the actual air temp. as home audio, in a much larger space, does same.
Home gear has less effect on the ambient room temp.
I'd imagine that cooler (more dense) air would assist things - warm gear and cooler air is good.
Edited by Winno, 30 June 2012 - 04:26 PM.
Posted 01 July 2012 - 12:04 PM
To get the same imaging on a cold day to a hot day can be as little as 0.05ms change in the time delay, and up to 45º in phase.
To change the temperature of the equipment changes tonality more than imaging, but both do change from cold to "operating" temperature.