When the volume is turned up both 12s cut out sometimes

You just go to the link I attached I'm sure you will get the solution of your problem chevy

Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/Cerwin-Vega-CLSC-12S-Subwoofers-manual/id/11225ci055/t/2/

My Restek has the same problem.
Change the volume potentiometer. Use an 10KOhm Alps potentiometer and your problem should be solved.
Peter

No, this sounds like a speaker problem to me.
It sounds like the voice coils in your speaker(s) have been fried.
What happens is the part that is burnt does not funtion, but as you increase the volume/voltage the speaker "jumps" foward to a section of voice coil that is not as damaged.
Check your speakers!

You did not specify the model you have - however the Flex series is only stable with a load of 4 ohm mono (bridged) and 2 ohm (stereo).
You are driving the amplifier to work too hard, and it is shutting itself down.
Re-wire using one subwoofer (bridged) or wiring the subwoofers on seperate channels.

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try upgrading the firmware of ur player
if ur player is touchscreen try turning off the device for some days

Check the wires for a lose connection or corrosion. You may need a capacitor.

Basically, at low power the amplifier is not asking for a lot of power from the electrical system to power your sub woofer. For lack of a better term and probably the best way to explain it is. It uses up all the power in the wires leading to it at a high volume, and has to wait for more. Kind of like when someone squeezes a garden hose when your trying to use it. That would be the high volume, starving the amplifier. The capacitor stores power in it to power the amp at high volume. 2 farads would probably be bulletproof on a single amplifier system, but 1 farad should work well enough. Or seek help from an expert on exactly what size capacitor you should use. If you find yourself saying: My amp cuts out.

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What do you mean it will bump, then cuts out?, Then you say it just wont't bump? Does it cut out after you go over a bump in the road, does the speaker bottom out and cuts out? Please you need to be a little bit clearer with the fault. and the symptoms.

Do you have the amp bridged first off? if you do unbridge it. Next,

1) Turn all the settings all the way down on the amp.
2) Turn your bass on the radio into the negatives (-2 or-3)
3) Turn the volume up to the point where your highs start to not sound good, then turn them down just enough to where they sound good again.
4) Turn your crossover to about half if your box is ported, or three Fiths if its sealed.
5) Raise your gain slowly untill either the volume doesn't get any higher or you hear the subs start to sound funny. Now turn it down just a hair.
6) Turn your crossover up a hair then down a hair and see what happens, if it gets a touch louder with out distortion then leave it. If it losses clarity then place it back to where it was.
7) Listen to a couple songs you know well and stand in front of your subs at volume to be sure theres no distortion.

You should be good at this point let me know if you need something else.