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Switch your amp on and leave it in the stand-by mode, you see tubes glowing.
Than you can pull another tube (same type) out of the amplifier and put it in those sockets. If they are also not glowing, there must be a wiring problem.
It very strange that there are two tubes not glowing.
Give it a try, you can do it yourself.
Your amplifier is trying to draw too much current. Your battery doesnt have enough power to run the subwoofers. My solution to the problem would be buying a power cap with equal or more power capasity to your current amplifier. The power cap stores a high amount of current so that when your subwoofers hit those low notes that draw a lot of current, instead of taking it directly from your battery, it will use the stored current from the powercap and wont go into protect mode. Also make sure that your connections on the back of the subwoofer arent touching. If you are hitting hard bass notes and the speaker (+) and (-) wires touch, it will short out and go into protect mode. But I dont think this is what your problem is. I am 99% sure if you go with the powercap, it will solve your problem.
hi there mate, is the sub earthed? sometimes this might be the problem, also check that all the cables are correct in the amp, there should also be a switch on the amp to lower or increase the output, this maybe turned all the way off, the remote lead generaly is usualy the thin blue wire behind the head unit the best way to connect this to your amp remote wire is to simply go to your local halfords etc and get a little wire joining clip. then you can conect them. any other problems please ask