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Message Forums Car Stereo Message Forums > Subwoofers and Speakers > subwoofer smells like its burning
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tomek77pl
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 subwoofer smells like its burning

hi i have an Orion CO8001 Car Amplifier - 1 Channel(s) - 800W hooked up to an Hifonics Zeus ZX12D4 12-Inch DVC 4-Ohm normal and with my bass knob half way and my radio turned up 3/4 full with a song that has a lot of base i smell something buring.Is it bad(prob) or is it just the sub breaking in? i had it running for about 2 hrs not full power on the knob and radio. What could the problem be is the sub to strong for the amp or what ? Thanks

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New Post 03-27-2011 03:59 PM
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larrypeters86
Senior Member

 

Where do you have the gain set on the amp?

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tomek77pl
Member

 

i dont have my car now cuz its at the machanic but all ofthe switches are turn all the way up so my guess is that it is

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New Post 03-27-2011 04:26 PM
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larrypeters86
Senior Member

 

There is your answer. You should never....never have the gain turned all the way up. You're clipping the amp and the smell is the coil frying. You are probobly reducing the life of the amp as well.

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New Post 03-27-2011 05:50 PM
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tomek77pl
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what is the specific voltage that i should turn the gain down to? the coil in the sub right?

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New Post 03-27-2011 06:13 PM
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sicaudio
Senior Member

 

that sub will take all 800 watts as long as it is not clipped... you really should have someone help ya out...

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tomek77pl
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What does clipped mean on a sub ? I don't want to pay for someone to do it for me I'm on a budget cuz I'm 17 lol is there an site that explains stuff like that I know the basic but I want to learn more

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sicaudio
Senior Member

 

use this chart...Photobucket

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Ianarian
Member

 

Many people drive their amplifiers into what could be called a square wave output (white line below). When an amplifier is pushed that hard, it is actually possible to drive the speaker with twice as much power as the amplifier can cleanly produce into the speaker. As you can see below, the yellow sine wave is the maximum 'clean' output that the amp can produce. When an amplifier is pushed way too hard, the signal will eventually look like the white line. The effective voltage of the white line is ~1.414 x the yellow line. This means the the total power driven into the speaker by the clipped (square wave) signal is double the power delivered by the 'clean' signal (yellow line). This means that the power is double but the cooling of the voice coil will not increase in proportion with the power increase (since the voice coil isn't moving as much as it needs to be for the given power dissipation). This will lead to the voice coil overheating. Uploaded with ImageShack.us

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New Post 03-28-2011 08:18 AM
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ymalmsteen887
Member

 RE:

quote:
Originally posted on 03-28-2011 by Ianarian
Many people drive their amplifiers into what could be called a square wave output (white line below). When an amplifier is pushed that hard, it is actually possible to drive the speaker with twice as much power as the amplifier can cleanly produce into the speaker. As you can see below, the yellow sine wave is the maximum 'clean' output that the amp can produce. When an amplifier is pushed way too hard, the signal will eventually look like the white line. The effective voltage of the white line is ~1.414 x the yellow line. This means the the total power driven into the speaker by the clipped (square wave) signal is double the power delivered by the 'clean' signal (yellow line). This means that the power is double but the cooling of the voice coil will not increase in proportion with the power increase (since the voice coil isn't moving as much as it needs to be for the given power dissipation). This will lead to the voice coil overheating. Uploaded with ImageShack.us

wow I couldnt understand any of that. I know that if you look at the yellow line as the speakers excursion then its just moving up and down. So the white line is basically showing that its going even faster from the resting position and apparently stopping which doesnt make sense it looks like its going up then the speaker stops and then goes back down which is really wierd.

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New Post 03-28-2011 11:09 AM
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sicaudio
Senior Member

 RE: RE:

quote:
Originally posted on 03-28-2011 by ymalmsteen887

wow I couldnt understand any of that. I know that if you look at the yellow line as the speakers excursion then its just moving up and down. So the white line is basically showing that its going even faster from the resting position and apparently stopping which doesnt make sense it looks like its going up then the speaker stops and then goes back down which is really wierd.



that is exactly what happens during clipping Ymalm.. the speaker moves then stops dead, but is still receiving power....if it is stopped it cannot move air over the coils which causes excess heat which burns coils ;)

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New Post 03-28-2011 12:14 PM
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tomek77pl
Member

 

I understand that now i am going to turn the gain down with that chart but in the manual for my amp it says that the gain goes up to 8 volts and for my amp that has 400 rms which on the chart is 40 volts can the amp produce that? I smelled the burning twice and once i smelled it i turned it down could that ruin the amp or did it just decrese the life of it?

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sicaudio
Senior Member

 

you need to be at 28 volts not 40...40 is for 1 ohm and ur sub wires at 2 or 8....400W RMS x 1 at 2ohms Car Amp 300 watts RMS x 1 at 4 ohms that is your amp... it does 400 rms at 2 ohms...so 28 -30 volts is the max you want to set it at and u have to use a -6db 60hz wav file not a mp3...

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tomek77pl
Member

 

my amp is ZX12D4 12-Inch DVC 4-Ohm so its an 4 Ohm sub and there is a 2 Ohm version which i didnt get but would my sub the 4 Ohm version work fine on 2 Ohms?

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New Post 03-28-2011 06:36 PM
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tomek77pl
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hey guys i got mmy car today so i went right to work on the subs/amp got a 60 Hz test audio song and i tuned the gained to 28.64 v bridged.I hooked up the sub to 2 Ohm but it doesnt sound loud at all. With the hifonics 12" sub there i two pairs of terminals and they both are marked the same so how do i know which is voice coil one and coil ? does it matter which coil goes first i am using this diagram to wire my sub http://a248.e.akamai.net/pix.crutchfield.com/ca/learningcenter/car/subwoofer_wiring/1DVC_2-ohm_2ch.jpg but i cant figure out the terminals. I also have a KIV-BT900 kenwood radio and i have the x over setup and i set the sub to 120Hz and -6 slope but 12 sounds louder is that a good setup or does it just depend on me and what i like?

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