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Last Fri was the first gig I setup for quite awhile and a lot longer setting up longer outside between buildings. It was in a different town so I packed the van about 1 in the aft because I had other things to do. We setup and the sound was absolutely horrendous. I flattened the EQ for outside and tweaked and tweaked. Finally it started sound like the old system.

It finally dawned on me!!! Inside that van it prob was 130 degrees.. Dont do that!!!

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I'm always careful of extreme temps where my instruments are stored, and especially when I haul them someplace.... never really thought about it with karaoke equipment. (it's a rarity that I haul any) But yikes, yeah, stored in an auto on a really hot day, I wouldn't think would be good.

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I always bring an extra shirt. Not that that always help. .

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I know pro dj's that have stored their stuff in trailers day & night - winter & summer with no problems. If a car stereo can take the heat/cold like that & run fine, then a PA that is usually built a lot sturdier with stronger components shouldn't have any problems. In cold they do like to let the speakers come to room temp before firing up.

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That's always been my thinking Lonnie but something was wrong and the only thing I can figure was extreme heat. As the evening cooled down it returned to normal. I did a gig sat night and everything was fine from start to finish. It was super humid for Colorado that afternoon. Dont know..

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I lived and worked in Montana and now live and work out of Phoenix, AZ and know all about extreme heat and extreme cold. I keep my gear in my non-airconditioned or heated garage and in my SUV and have never had a problem in the heat. Most gear's internal operating temp is higher then you would think. Letting your speakers warm to room temp if they have been kept in freezing temps is a good idea. Condensation has claimed the life of some of my gear because I did not let them thaw before firing up.

Sound mixing in outside venues can be tricky and I have found that clipping your system is much easier because there is nothing to contain the sound and I would imagine that being between buildings added some weird bouncing of the sound.

Do you think that it may have been a coinsidence that your tweeking paid off finally at the same time that it was cooling off?

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"Don't worry. It will feel better when it quits hurtin."

I'm not sure... I have done many outside gigs and played all aft in triple digits then at night. Here in Colorado there is a typical 30 degree spread between day and night temps.

The initial symptoms were. One JBL Eon was popping (lows) until I turned the bass down.Could not get a decent mic level and had strange feedback. I flatlined the EQ at zero all the way across on the CFX12 and that helped the most.

Most components now have a high tolerance to wide temp extremes but for example electrolytics dry out with heat. Coefficient expansion and contraction with wide temp ranges are not good on speakers. Cd's in the van would have curled. I dont think I will subject the system to those conditions again. At least I will park in the shade.

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I don't believe the heat explanation. I am guessing a CFX12 has like a 7- or 9-band graphic EQ. It's a lot easier to mess up your sound than to fix anything with an EQ like that.

I doubt this is the case with Eons as they are powered and should have some kind of smart protection circuitry in them, but my partner did something real stupid and overheated all the horn drivers on my rig once. It sounded like (@$%&#!) for at least an hour because of that. Some kind of passive protection circuit that saved them from permanent damage, but they weren't getting a lot of power and thus the rig sounded boomy and lacked any HF response.

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Jeff Wheeler, moonlight DJ/KJ

Having up till recently been using a Mackie desk I came to expect that sort of behaviour from it on occasion.
My second Mackie desk played up more often.
No reason other than they must hate me.
I would tweek till I was blue in the face.
Then it would go right all on its own.

Got my own back... I now have a Zed 14.

Could it be The Mackie Gremlins.