| Amp producing DC current? |    |
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Gabe Sanchez
Advanced Contributor
Joined : 26 Jun 2007
Posts : 354
|  Subject: Re: Amp producing DC current?  Thu Jul 24, 2008 1:38 pm | |
| If you want to pull the woofer apart and take a picture of the coil, we can pretty much guess what the cause of failure was.
Did you change enclosures at all? Bad porting can have a lot to do with woofer failure as well ... all electrical issues asside.
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Gabe Sanchez
Pioneer Electronics
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Gabe Sanchez
Advanced Contributor
Joined : 26 Jun 2007
Posts : 354
| | Subject: Re: Amp producing DC current? Thu Jul 24, 2008 1:39 pm | |
| I am writing a book btw for us Car Audio guys.
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Gabe Sanchez
Pioneer Electronics
National Trainer
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Talonesi
Pro Contributor
Age : 27
Joined : 26 Jun 2007
Posts : 508
: Wichita, Ks
| | Subject: Re: Amp producing DC current? Thu Jul 24, 2008 1:42 pm | |
| | Gabe Sanchez wrote: | | I am writing a book btw for us Car Audio guys. |
will it have nudey pics to keep us interested?
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Troy Royer
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Tub Asko
Novice Contributor
Age : 19
Joined : 08 Apr 2008
Posts : 244
: Zachary, LA
| | Subject: Re: Amp producing DC current? Thu Jul 24, 2008 1:53 pm | |
| | Gabe Sanchez wrote: | If you want to pull the woofer apart and take a picture of the coil, we can pretty much guess what the cause of failure was.
Did you change enclosures at all? Bad porting can have a lot to do with woofer failure as well ... all electrical issues asside. |
The l7s box was the same for a year, they failed on the 1 year mark. The DCs happened as rusty stated, coils almost ash and 2 snaped leads. I still have the 2nd woofer which still works . . .sort of.
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Big Chris Team BAD COMPANY Team DC AUDIO Team POWERMASTER  |
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Skip01
Pro Contributor
Joined : 01 Jul 2007
Posts : 647
: Marrero, LA
| | Subject: Re: Amp producing DC current? Thu Jul 24, 2008 6:03 pm | |
| Was that with the amp at 1ohm?
Maybe the amp was just consistently sending them a dirty signal til it finally went....splat, not just all of a sudden...prolly was a slow death
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Tub Asko
Novice Contributor
Age : 19
Joined : 08 Apr 2008
Posts : 244
: Zachary, LA
| | Subject: Re: Amp producing DC current? Thu Jul 24, 2008 6:25 pm | |
| lol, the amp was at 2 ohm. The woofers themselves were in bad shape to begin with and were losing air around the "rim"
The one that blew sounded like it would have an overexcursion when the volume was up too much. "popping sound" if you will. The rim was warped on that one too.
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jkrob21
Pro Contributor
Age : 32
Joined : 25 Jun 2007
Posts : 780
: Hot Springs,AR
| | Subject: Re: Amp producing DC current? Thu Jul 24, 2008 6:55 pm | |
| | Gabe Sanchez wrote: | I really hate to break this to you and I am sure there is going to be a lot of people that don't believe me, but that is okay. It will just show how much people really know about amps.
It is IMPOSSIBLE for a car audio amplifier to product a true "DC" signal. Rather then explain it the science behind that let me just put it like this.
A speaker requires an AC signal to allow a cone to travel out then and backwards. If there was a DC signal the cones would simply push out or backwards and stay there. Even in a fully clipped signal is still AC.
There is a demonstration I can do to prove there is no DC that exists. All that is needed is a light bulb, large capacitor, and an amplifier with signal to it.
Clipping, and over powering take out subs. |
I'm not arguing with you at all as I have zero experience in amplifier design and production but we had a Rockford amp go crazy on us once and when we sent it in for repair they told us it was putting out straight DC.
We checked it on our bench before we sent it in and our test speaker would just go into full excursion and stay there until the amplifier was shut down. Reverse the leads and the speaker would hit the back plate and stay there. No motion back and forth. Based on what I saw and the very little I know about AC and DC current. I found Rockfords evaluation to hold some water.
What else could cause this to happen?
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John Roberts
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djman37
Novice Contributor
Age : 41
Joined : 25 Jun 2007
Posts : 231
: Dallas, TX
| | Subject: Re: Amp producing DC current? Thu Jul 24, 2008 6:59 pm | |
| | Talonesi wrote: | | Gabe Sanchez wrote: | | I am writing a book btw for us Car Audio guys. |
will it have nudey pics to keep us interested? |
just make a flipbook of his avatar on the upper right corner of the book, I'd buy it.
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Doug Blohm
Team Aces
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2003f150
Advanced Contributor
Age : 25
Joined : 12 Sep 2007
Posts : 310
: Biloxi,MS
| | Subject: Re: Amp producing DC current? Thu Jul 24, 2008 9:41 pm | |
| One time I had a Tsunami 1800D that messed up 4 diff woofers till i figured out it was the amp. Maybe the amp is bad???
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Bret Arceneaux
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Tub Asko
Novice Contributor
Age : 19
Joined : 08 Apr 2008
Posts : 244
: Zachary, LA
| | Subject: Re: Amp producing DC current? Thu Jul 24, 2008 10:06 pm | |
| ehhh I hope not, it's out of warranty
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2003f150
Advanced Contributor
Age : 25
Joined : 12 Sep 2007
Posts : 310
: Biloxi,MS
| | Subject: Re: Amp producing DC current? Fri Jul 25, 2008 11:04 am | |
| Time for a M3???
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Bret Arceneaux
Team S.P.E.A.D
2003 Crew Cab F150
4 9515F's
2 DD M3's
Mod 1001-2000
157.3 @ 47HZ
SB4 156.0(young jeezy 44hz) |
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Tub Asko
Novice Contributor
Age : 19
Joined : 08 Apr 2008
Posts : 244
: Zachary, LA
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2003f150
Advanced Contributor
Age : 25
Joined : 12 Sep 2007
Posts : 310
: Biloxi,MS
| | Subject: Re: Amp producing DC current? Sat Jul 26, 2008 6:31 pm | |
| Damn Tub big baller!!!!
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Bret Arceneaux
Team S.P.E.A.D
2003 Crew Cab F150
4 9515F's
2 DD M3's
Mod 1001-2000
157.3 @ 47HZ
SB4 156.0(young jeezy 44hz) |
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Skip01
Pro Contributor
Joined : 01 Jul 2007
Posts : 647
: Marrero, LA
| | Subject: Re: Amp producing DC current? Sat Jul 26, 2008 7:17 pm | |
| haha....that would be purdyyy nice
but for the price u could get alot more power
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Daily DRIVEN
4 12" Type R
500.1(.5ohm)
153@44hz
200.1(.5 ohm)
152.6@43hz
"Burpin is for babies" |
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S.L.A.B.
Novice Contributor
Age : 29
Joined : 14 Jul 2008
Posts : 62
: Jennings LA.
| | Subject: Re: Amp producing DC current? Sat Jul 26, 2008 9:37 pm | |
| | seems like it would be possible if wires shorted/burnt in the amp and came intact with the DC side. |
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