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the gmax amps are only 2ohm stable. it is odd that they both blew at the same time but if the impedence is too low to amps will fail.dual 4ohm dvc subs wired in parallel should read around 2ohms. allthought impedence varies with frequency and isnt truly stable.
OK-3 issues here but you already know one lol-you bought a substandard amp for some bad *** power hungry subs---thats your first issue :)
Check the ground for the AMP it shouldn't be any longer than 12" from the amp to its grounding point-Any longer than that and several issues can happen, like poor power to the amp, feedback (winding noise over the speakers, usually changes pitch or frequency with the engines rpm's), intermitant substandard sound (your experiancing this) and coil bounce (your subs move in and out producing little to no sound, you are experiancing this as well)
The same issues can come from the amp not having enough constant power to sustain the subs when they hit repeditivly, to fix this you need to buy a cap and add it to your system- A cap quickly charges using the battery, and supplies the extra umph your amp needs so it can push the subs without starving itself. With the subs you have I recommend a 1.5 to 3 fared capasator
I am not able to offer a for sure solution because I dont have enough
information and can only seem to find small pics of this product on the
internet so I am not able to view it well. So I will offer what I can
to help. Perhaps you are not using a 4 channel amp? There also may be a problem with the output terminals on the box itself..maybe the wires inside coming from the subs are not connected properly to the outputs. How are you testing each sub individually? If you are testing with speaker wires coming from you amp well then we know that you amp is working...if you have taken apart the box and messed with the subs to test them maybe there was a small mistake made when reconnecting the wires? Like a positive connected to a negative or something? Maybe a fuse blew on your amp if you have one, or in your car? I cant be certain because there is not to much info to go on here so I hope that what I have given has helped you in some way...if each sub is working when you test them then it is nothing on or with the box except the wires maybe being reversed on accident or a bad connection on the output terminals on the back of the box, make sure those are connected properly on the inside. Other then that its probly not the box...maybe your amp is not big enough to handle all 3 subs and you are running a 2 channel amp and blew a fuse? You may or should get a 4 channel amp if you dont have one...like I said not to much info provided so good luck to you and hope I helped in at least some way!! :)
be careful with fosgate amps. They are more powerful then what is stated on them. I found this out when I blew a 15 with a punch 260ix. These amps are made for competion use. The 600.1 does not push 600 watts as stated. I had one tested and it actually pushes close to 800 watts. Turn ur bass level and ur gain to about 3/4 power and this should solve your problem
fuses wont restrict the current flow the amp is way too much for that sub. it may not have damaged that sub yet but it will. you might only need a 100 watts rms too run it.but you will need sowe where about 2000 watt sub too run off that amp
well first off the cap should be reading 14.00 volts not 12 but check on ur settings maybe its to high if that dont work then ur amp or amps is way to powerfull for those sub or theres not enough watts from the amp to the sub causeing the amps to under power the subs but let me no if u got it im all wayz here to help
if you have real old wires from the amp to the sub try getting new wires on it. check the little wires that go to the cone itself on the sub. sometimes they can manage to get pulled out of their terminals and make sure that thier touching the terminals on the correct spot