Normal for sub to be hot after use?

[ExtremeODD 10+ year member]

Well when pulling my eclipse 8812 out of the box after I noticed that I pulled most of a plastic bag from the port (some was inside, stuck), I noticed that the sub was rather warm, hot if you will. The magnet was the hottest part, and the basket was warm, cone was nice and cool as usual. Nothing looked wrong with the sub, Im thinking it might just be normal for woofers getting ran hard and somewhat overpowered (giving the 500w woofer 600w) but you never know so I figured that I would ask.

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[Rawb]

moving parts = heat

 

[SAG3 5,000+ posts]

normal

 

[ExtremeODD 10+ year member]

alright, thanks for the quick replys. It just seemed weird at the time.

 

[dkguitarist 5,000+ posts]

that's normal. if you start smelling something very horrid, turn it down/off immediately. especially if you start seeing smoke (highly unlikely in your case tho). but you WILL smell the vc's burning up if you're pushing them too hard.

 

[Astyl 10+ year member]

i

 

[lilmaniac2 5,000+ posts]

^^^ what he said

 

[CBFryman2 5,000+ posts]

im really bored so i will show you some magic.

Lets take a rough geustimate that your suspnesion requres 25N to move 20mm.

You are playing 50Hz. 50 cycles in 1sec = 1m of total distance travled with 25N of foce in 1sec.

That is 25w of mechanical power.

your voice coil is dicipating 475w of heat if you are feeding it 500w of electrical energy.

 

[CBFryman2 5,000+ posts]

if you want me to i will research the specific heat of ferrite and tell you exactly what the tempature rise would be in X ammount of time assumeing no heat loss to the surroundings.

I could really amaze you and take in air's specific heat value and tell you an aproximation of the temperature of the magnet after X ammount of usage with Y ammount of power and you could go try it out.

Isnt phyics wonderful. And silly gooses think speakers are magic.

 

[theCybe 5,000+ posts]

On a lighter note, any chance the bag was blocking your pole-vent? //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[CBFryman2 5,000+ posts]

x2

no venting can cause heat buildup.

 

[RumbleNTheTrunk 10+ year member]

i **** and all I smelt was burning glue. //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif