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subwoofer abuse


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still_walkin 
Silver - Posts: 644
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Joined: April 18, 2007
Location: California, United States
Posted: April 26, 2008 at 5:40 AM / IP Logged  

i was scannig the internet and im noticeing on u tube people are wiring sub woofers to 120v ac (wall plug) to a subwwofer . what is the point of this and i would conisder this dangerious. what do you all think 

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i am an idiot 
Platinum - Posts: 13,667
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Joined: September 21, 2006
Location: Louisiana, United States
Posted: April 26, 2008 at 6:05 AM / IP Logged  
It is much more fun to connect a 6X9 to 120 volts. A subwoofer can take it the 6X9 doesn't last long at all. For safety we cut the end off of a decent size extension cord connect the speaker to it. Attach a rope to the end of the plug that you are fixing to plug into the wall. This is to make sure you can unplug it if something were to go wrong. Plug it into the wall and you have a dancing smoking speaker.
still_walkin 
Silver - Posts: 644
Silver spacespace
Joined: April 18, 2007
Location: California, United States
Posted: April 26, 2008 at 7:37 AM / IP Logged  
So thats the purpose if that to watch a dancin smokin speaker. Any other reasons I'm just curious cause a speaker takes signal and you are inputing a power signal
1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"
haemphyst 
Platinum - Posts: 5,054
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: April 26, 2008 at 8:57 AM / IP Logged  
Yes. A "dancin', smokin' speaker".
We used to do it to blow a driver for warranty purposes. Eventually, nearly EVERY driver will blow, some just take longer than others. (Consider the power you are applying!)
120V X 1.414 = 169.68V pk-pk
170 * 170 / = 7225 watts peak power!
7225 watts / 170v = 42.5A
That's a TON of current to push through a little bitty voice coil wire (even though some are smaller than others!)
We used to have to clamp Eclipse Ti woofers face down to the bench to get em to "go away".
It CAN be dangerous, after all you are playing with live 120 volt current, and relatively bare wires. If one were to come loose, you certainly run the risk of shock.
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

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