Question about Volfenhag ZX-4712 Car Subwoofer

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Subs stopped working & protect light on the amp is red...

Ok first questions were is the serial number located on these subs? Ok well I bought 2 VOLFENHAG 2000 W SUBS and VOLFENHAG ZX 7180 2 CHANNEL 1600 WATT AMPLIFIER Item URL:http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=130094810110&sspagename=ADME:B:AAQ:US:1 My brother in law and I installed them just fine. Then a few days later one of the subs stopped working and the protect light on the amp started turing red. We took a closer look and noticed that the sub just kept making a hissing noise, and you could smell something burning in the sub, my brother in law said it may be the voice coil. So we took that one out and just had the one left hooked up. Except the next day that sub stopped working and the protect light on the amp is turning red again. I havent had time to check this one out yet, im been busy with college. We plan on trouble shooting and see what we can find out. My brother in law has the same subs as me but with a different amp. What i need to find out is if its the amp or the subs. Any help or suggestions are GREATLY appreciated. I would like to figure out the problem so i can send what i need to back and get new ones as soon as possible Thanks Corey Johnson

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  • Corey Johnson May 18, 2007

    Thank you very very much!

  • Anonymous Feb 13, 2008

    Im basically having the same problem. Initially my power light wouldnt come on, only the protect would, so i took my system to best buy. Upon arrival the green light was on and they thought i was just an idiot. they explained to me how if a positive and negative speaker wire touch the amp switches into protect mode, but when the technician touched the two wires together it did NOT switch into protect mode, this made the technician uncomfortable. He finished with my system and it worked great for about 2 days and then i noticed my lights dimming drastically one evening and popped my trunk and noticed both the protect light and the power light were on. I have done everything 2 or 3 times and nothing will get the protect light off. I brought my amp to best buy for them to test and they determined that it was no good. Now i cant find how to get it fixed or replaced. So far its been a waste of my hard earned money!

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Well at this point i would say it is both,, the subs fried because your amplifier passed dc [direct current] and fried the voice coils on your subs....return them if they are under warranty,, the amplifier sound like you either operated it beyound its specifications or it has a defective output stage allowing it to pass or leak dc....it turned the voice coils into the equivelent of the runners in a toaster oven....when an amp passes dc it is going to do so to whatever speakers you hook to it....so either bring it to a shop to be fixed/ return it to place purchase for exchange or throw it away.....or you will continue to experience the same problems....I am sorry..ps the amp goes into protection when it detects a short...[ the short is produced by the amp and it is detecting its own fault and putting it in to protection after it BURNS up your drivers....

Posted on May 18, 2007

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I have 2 10" Sony Explod Subs and a 1000w amp. My fuze was blown but i bought a new fuze that was stronger. My system is still not working.
the amp has power, ground and emote turn on? is the amplifier lighting up? is it going into protection?check the wiring to the amp before you suspect a bad sub and amp

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I have 2 amps instalkled in my car one is sony 1200w 2 channel amp for speakers and one is solid audio f2500d for 3 subs my sound and every thing was good but suddenly from yesterday im having trouble when...
First disconnect the CD head unit from the sub amp and see if the other amp works. If yes, the problem is the wires to the amp, the amp itself, or the subs/sub wiring. If no, the problem is the head unit--probably an internal short.
If the other amp works with the sub amp disconnected, reconnect the sub amp to the head unit, but disconnect the sub wires from the amp. Try the CD player. If the amp goes to protect with no speaker wires attached, the amp is bad. If the amp is OK, the problem is the subs or sub wires. Hook the wires up to the amp again, but disconnect them from the speakers. Try the player again. If the amp goes to protect, the problem is the amp wiring. If not, the problem is the subs. Check the impedance of each sub using an ohmmeter to determine which amp is out of spec.
Please let me know if you have questions, and thanks for using Fixya.

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What does the red light mean i have had mine amp for a year use to run fine but now the subs dont work has power tried amp on otherr subs works fine
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Is your gain all the way up? If it done this before, sounds like your over working the amp. Make sure your subs ohm load is capable with the amp load to. If they are 1 ohm and your amp is only 2 ohm stable, it would beat for a lil bit then go into protection mode to. Check your wires too.

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sounds like the amp is in protection mode. try disconnecting the subs and see it the light changes to green. if it does then the subs are your problem. if the light was allways red while it was working then the subs may be disconnected inside the box or have gone bad. try using a diffrent speaker and connect to the amp.

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might have roasted your speakers voice coils a little which may be sending the amp into protect mode throw a speaker on it that you know works and if it doesnt trigger the protect circuit then you probably have a blown or almost sub.

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How do I fix the problem so they work again.?
A 1000 WATT AMP HAS PROBABLY GONE INTO PROTECTION MODE BECAUSE YOU ARE TRYING TO RUN 1600 WATT SUBS COMBINED

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1 Answer

Amp doesn't come on
Hello rheabarb,

You did not say whether or not you checked the wiring going to your subs. Many times, a shorted or grounded speaker wire will cause an amp to fail. And if the amp powers up OK with the subs disconnected, I'd suspect one or more of the wires.

Hope this helps.

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CRATE PA-B6350 no output
The 2 speaker jacks are wired in parallel. If your subs are 4 ohm rated the amp is seeing a 2 ohm load and may be trying to protect itself - hence the red light. I would suggest you unplug 1 of the subs and see if the problem goes away. You may have a problem with one of your subs. This amp is probably not the best choice for such demanding work as it is not fan cooled. Good luck.

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Ok This is a two channel High Current amp. It is stable to one ohm. If the Subs are single voice coil at two ohms the they have to be wired in Parallel that means (Red +) (Black -) are connected to the + and - of another sub and then the (RED +) (Black -) from both go to one output channel of the amp. You pair the other two in the same fashion on the other output channel. If you are getting no output (sound) at all first check if the amplifier is going into protect. (Usually indicated by a red led on the unit. If it is connect only one Sub to each output and see if the protect LED goes out. If it does then you should have sound at the subs. If not check that you have the sub output enabled on the HU some head units do not come with the sub output enabled on the HU. If every thig is enabled, with only one sub connected to each output and the protect LED is not on then your amp is probably blown and needs repair. Nice thing is that MA has a great warrenty policy. Check and make sure the protect LED is off. If it is on you probably have the SUBS wired wrong

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