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amp dropping below 1 ohm and overheating?


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Aphix 
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Posted: January 08, 2008 at 9:47 PM / IP Logged  
I bought a factory refurbished Kenwood Kac-X1R amp a week ago. I hooked it up and tested my load with a ohm meter and it read out 1 ohm with four, four ohm, subs. Right away it wasnt playing so hot. It overheated fast and not too long later the fuses blew. So far I've went through seven fuses which separately blew. I've had the subs wired into 1, 2, and 4 ohms, each time it blows. Sad thing is that my old doodiety amp plays just two of the subs harder than the kenwood at less than 300 watts rms. I called a local kenwood dealer and they told me the amp may just be stable at one ohm at low loads. My problem is that I cant tell if the amp is just defect, or if the amp is really just stable at one ohm at low loads? Because I don't want to exchange this one for another amp that isnt going to work like I want it. Anybody have any knowledge with this?
ice32 
Copper - Posts: 116
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Posted: January 08, 2008 at 9:57 PM / IP Logged  
http://www.kenwoodusa.com/Car_Entertainment/eXcelon/Amplifiers/KAC-X1R
The amp supports 4,2,1 ohm loads, so it shouldn't be that, good luck troubleshooting the rest. seems its refurbished, may just be defective?
Aphix 
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Posted: January 08, 2008 at 10:01 PM / IP Logged  
Yeah thats what I was hoping. It just sortof mentions that its stable at one ohm as a side note at the bottom so I'm wondering if theyre like oh we'll say it can play at one ohm and just not focus on it or something. Ik kenwood isnt famous for making efficient non-overheating amps. If the next one I get is defect I'll have spent one and a half months waiting for this thing. Does anybody have experience with issues like this?
chucksnee 
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Joined: January 29, 2003
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Posted: January 08, 2008 at 10:15 PM / IP Logged  
Aphix wrote:
So far I've went through seven fuses which separately blew. I've had the subs wired into 1, 2, and 4 ohms, each time it blows.
If they are still blowing at 4ohm then something is wrong with your amp....
If I read correctly...
jeffchilcott 
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Joined: April 11, 2002
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Posted: January 08, 2008 at 10:16 PM / IP Logged  
A few questions.
What size power and ground wire do you have?
Have you measured the resistance on the ground wire?
How much current can your vehicle support? Are you overloading your alternator and causing large voltage drops?
How is your gain set?
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Aphix 
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Posted: January 08, 2008 at 10:22 PM / IP Logged  
I'm running four guage power and ground, which is the largest size the amp clips can take. Ik that ideally 0 gauge would be best but it wouldnt fit and its wat I have on hand already. I could check the resistance tmrw but its a direct bolt into the sheet metal in the trunk. I can see the interior lights dimming if I watch CLOSELY and the voltage would drop .5 volts at most according to the readout on the amp. And my gain was set pretty conservatively since anything over a small humm from the subs popped fuses.
aznboi3644 
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Posted: January 09, 2008 at 12:59 AM / IP Logged  
how is your amp grounded??
what is the voltage at the amp terminals??
Aphix 
Member - Posts: 25
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Posted: January 09, 2008 at 8:54 AM / IP Logged  
The amp is grounded directly to the metal in the trunk area. It will have a fairly steady 14v current.
advanced_audio 
Copper - Posts: 170
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Posted: January 09, 2008 at 9:27 AM / IP Logged  
Sounds to me like the amps toast.
Aphix 
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Posted: January 09, 2008 at 4:42 PM / IP Logged  
So you guys think its just a bad amp and that if I had a working one it would run 1 ohm fine?
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