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I have a hifonics Zrx1200.2 amp. I am running 2 Rockford fosgate p3 12s with it. The specs on amp and subs match perfect. So I have everything wired correctly, it least I sureeee think so. Subs are dvc 4 ohm and I have them wired at 2 ohms each. So anyway on to the problem.. I turn on my car and the amp lights up and everything seems to work fine, I will have volume at 45 of 60 and it will sound greatttt. But then, after about 15 minutes the amp gets SO hot, I could fry eggs on it. Then if I play it for another minute or two it goes into protection mode. It was doing this when I had it on the floor of my trunk and then I realized the vents were covered so I was like o this is easy to fix and made a little mount for it so it could get air to cool it. After this I went for a drive and sure enough it was just as hot as before accept after 20 minutes this time. Any ideas? I don't want to put into protection mode all the time... I am running 4 Guage wire for power and ground and 12 Guage for sub wires. Thanks in advance!

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U could just not have enough battery power or the load on the amp is to much. if the amp is in stereo mode it should work but if it is in bridge mode the ohms would be to low .. best thing is to get a sub amp with a 1 ohm stable capacity.. and you amp should be at least one third more powerful than the subs..eg: if the 2 subs is 1000 w each the the amp should be 2500 rms and up to prevent the amp from maxing out and over heating etc.

Posted on Jun 15, 2013

  • Cody Adomat Jun 16, 2013

    Thanks that was helpful! But the reason I got the stuff I did is cause I don't have much money and so anyways I have found online that class a/b amps like this one naturally run hot (wich mine was overheating so obviously not right) but I didn't have the volts (gain) on amp matching my head unit 2v pre amp output. I did that and got 2 old comply fans and it stays cooler! If I pound at 50 of 60 volume it gets hottt. But hasn't overheated yet. So I think I solved it! And I don't think it's pulling to much from the battery cause my lights don't dim super bad.. Whereas my friend is running a power acoustic mono d 2400 watt max amp and his lights dim way more. I don't know much about battery stuff in cars.

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Posted on Jan 02, 2017

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SOURCE: Rockford Fosgate 800a2 To 2 SVC 2ohm subs

Ok.. Bridge the two sub into 4ohm than bridge to amp.


So. this how it goes.

sub1 + -
to      | |
sub2 - +
=      4ohm
       

           From Sub
                Two
            -          +  
            |           |
amp (L) - + (R)- +


This will use the full potiental of RF 800a2 amp. I believe it like 1153 watts max out.

Posted on May 29, 2008

Tim Swiercinsky

  • 1126 Answers

SOURCE: 2 12" dvc subs 2 ohm stable amp

+ on amp output to + on speaker #1 to + on speaker #2. - on amp output to - on speaker #1 to - on speaker #2. This is a parallel circuit....4 ohms in parallel with 4 ohms = 2 ohms. IF it were wired in series....would represent 8 ohm load.

Posted on Nov 12, 2009

Christopher D D

  • 3 Answers

SOURCE: my nitro bmw 486 cuts out when i turn the volume up alittle bit,subs start crackling and distorting turn volume back down sounds just fine amp doesn't go to protect mode still works 4 guage wire a

The First thing I would check is, check the voltage at the power terminals of the amp. This to make sure that there is no problems with the supply voltage. If you have a fuse in the Red 4 gauge power line, check it before and after the fuse. The last place to check is where red 4 gauge wire connets to the main power supply.

Protection mode will also activate when the amp temperature gets too high. But since it is stated that the amp is anly warm to the touch. That should not be the problem.

I would check the speakers impedance if it is too low you might get same symptoms that you are experiencinng now. Also if the impedance is too high can
also cause this problem. Measure at the speaker with the speaker wiring disconnected from the speaker. Then take measurements at amp outputs. Also disconnect the wire from the amp and take the final and compaire the measurements, they all should be very close, I would say with in 1 or 2 Ohms.
Is it possible that the amp got wet, would you be willing to open the amp up to see if any IE( rain water had gotten on the board.

Posted on Aug 28, 2012

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Ok.. Bridge the two sub into 4ohm than bridge to amp.


So. this how it goes.

sub1 + -
to      | |
sub2 - +
=      4ohm
       

           From Sub
                Two
            -          +  
            |           |
amp (L) - + (R)- +


This will use the full potiental of RF 800a2 amp. I believe it like 1153 watts max out.

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