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can’t wire at 2 ohms?

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=105062
Printed Date: November 28, 2021 at 8:53 PM


Topic: can’t wire at 2 ohms?

Posted By: wishuponansg
Subject: can’t wire at 2 ohms?
Date Posted: May 27, 2008 at 9:13 PM

i had someone tell me i couldnt wire my 2 15" kicker cvr DVC 4 ohm subs at a 2 ohm load (on a brutus bxi 1606D).  is there any truth to this? im kinda retarded when it comes to the ohms thing, and yes, ive read over the ohms law page... several times. the subs were wired at 4 ohms (before the amp went out).  any answer is appreciated.



Replies:

Posted By: DYohn
Date Posted: May 27, 2008 at 9:22 PM




Posted By: wishuponansg
Date Posted: May 27, 2008 at 9:30 PM

DYohn] wrote:

ry here:  https://www.the12volt.com/caraudio/woofer_configurations.asp

AH - HA!! thanks much.





Posted By: wvsquirrel
Date Posted: May 27, 2008 at 9:35 PM
Simple answer is No, you can't wire (2) 4ohm DVC subs into a 2ohm configuration.

However if I found the right specs then the Hifonics Brutus bxi series amps are 1ohm stable. Why are you worrying about a 2ohm load? You can simply wire the subs into a 1ohm load instead.

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Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
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Posted By: wishuponansg
Date Posted: May 27, 2008 at 10:23 PM
eh, im not sure how capable of 1 ohm it actually is. it says it is, but... a lot of amps say that... and just ending up crapping out/over heating.




Posted By: wvsquirrel
Date Posted: May 27, 2008 at 10:30 PM
True. Alot also only give you around the 2ohm load rating at 1ohm instead of the specified 1ohm rating.

You said "before the amp went out". Were you referring to the Brutus or a different one?

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Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com




Posted By: wvsquirrel
Date Posted: May 27, 2008 at 10:38 PM
If it is the Brutus amp that "went out" here's an excerpt from the manual concerning the on-board diagnostic system...

Description of the Diagnostic system built into all HiFonics amplifiers

The diagnostic system will shut down the amplifier, until reset by turning the head unit off, and back on. This state of affairs will be indicated by the front panel
PROTECT LED lighting up under the following conditions:

1 - A sort circuit on the loudspeaker leads.

2 - An internal amplifier fault that causes a DC offset on the loudspeaker output.

Should the amplifier go into diagnostic mode, simply disconnect all RCA and speaker leads, while keeping +12 volt, power ground and remote leads connected.

1. Now turn the amplifier back on, and if the diagnostic LED lights, the amplifier has an internal fault.

2. If not, plug the RCA cables back, and reset the amplifier. If it goes into diagnostic now, the fault lies in the input, either with bad cables or source unit.

3. If the amplifier seems ok with RCA cables plugged in, connect the speakers, one at a time, and if one of speaker or its wiring is faulty, it will activate the diagnostic system.

-------------
Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com




Posted By: wolf56
Date Posted: May 28, 2008 at 12:05 AM
i have the 1606d hooked up to 2 12" type-rs, wired to 1-ohm

it pounds the h*ll out of them, and doesnt get noticably warm at all




Posted By: wishuponansg
Date Posted: May 28, 2008 at 11:21 AM
well, the amp would turn on and seemed to have a signal, but would produce no sound, so im sending it back to get another one (another 1606D). the amp that went out originally was a 1606D. i'd really like to wire it at 1 ohm next time. i'm just worried about how much the 1 ohm load would be with my cvr's. being that they're rated at 500 watts rms. anyone had any experience with putting CVR's under a lot of stress?




Posted By: klctexas
Date Posted: May 28, 2008 at 12:42 PM
It's a strange situation, but I have my two 12" DVC 4ohm Kicker CVX wired parallel/parallel (which would present a one ohm load), and my amp is a Kicker zx1000.1, not one ohm stable. I have measured at the amp terminals, and the resistance is between 1.9 and 2.2 ohms. And yes, I am still running this setup with no problems. Still, no one has been able to explain it to me.  Here's a link to another thread.

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Soldier: This is the worst part. The calm before the battle.
Fry: And then the battle is not so bad?
Soldier: Oh, right. I forgot about the battle.




Posted By: DYohn
Date Posted: May 28, 2008 at 1:19 PM
No one has been able to explain what to you?  That the measured DCR is different from the rated impedance?  That's how speakers work.  If you have them wired for a 1-ohm net load and are measuring 2 ohms, it's probably simply that the DCR is different from the impedance and since ratings on speakers are never 100% exact and you got lucky that the net load is high enough for your amplifier to withstand.  No big mystery.

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Posted By: klctexas
Date Posted: May 28, 2008 at 2:00 PM
Well I guess that explains it, except for what DCR is. I wonder why nobody else was able to tell me that?

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Soldier: This is the worst part. The calm before the battle.
Fry: And then the battle is not so bad?
Soldier: Oh, right. I forgot about the battle.




Posted By: joch1314
Date Posted: May 28, 2008 at 2:10 PM
I agree with DYohn... the speakers impedances are never exactly what they say they are, I've seen supposed 4 ohm coils measure as high as 5 - 5.5 ohms.  helps when you're trying to get two 4 ohm dvcs to a two ohm load, even though in theory you're never gonna get it to 2 ohms!  sometimes you will, your also gonna get some resistance with the speaker wire hooked up, further changing the resistance shown to the amp!!!   AWESOME

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...half of the truth can be worse than a lie. <----Roger Russell said that..




Posted By: DYohn
Date Posted: May 28, 2008 at 2:25 PM

klctexas wrote:

Well I guess that explains it, except for what DCR is. I wonder why nobody else was able to tell me that?

DCR = DC (direct current) resistance.  It's what your ohm meter measures and is determined by the materials in your voice coil.  This is different from impedance, which is caused by the magnetic properties created in the the coil of wire called the voice coil by the changing current due to the AC frequency of the signal you are feeding it.  I don't know why others couldn't tell you that because it is very basic loudspeaker theory.  I suppose it's because they really don't understand how loudspeakers work.  posted_image 



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