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There sould be an input level control on the main amp that drives these woofers. Adjust the input so that even iof the stereo is tuned up all the way the amp is limiting the amout af input. Before you do this and turn up the stereo, turn down the amp input control all the way then you can slowly bring it up when you turn up the stereo's volume. Good Luck
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sounds like the Impedance of the speakers does not match that of the amp, therefore the output stage of the amp is trying to compensate, driving the amps too hard and eventually causing the thermal cut out to activate. Check the ratings on everything are compatible before you start sending it off to be fixed.
The problem I have had with a PS-20 is a blown capacitor. Hooked to a radio, would allow radio to receive fine, but when trying to transmit, amperage would bottom out. Behind the transformer is a large circuit board. UNPLUG POWER SUPPLY, remove cover, Undo the two nuts, flip board over, and gently rock the 4700uf capacitors side to side. If they move more than 1/16th of an inch, chances are they are blown. Remove/replace and should be good to go...
its hard to tell whats wrong with so little info , but theres alot that you can check ,
Is your amp putting out the power ? If the amp is a Pro series 750x amp then check your amp inputs they might be too low hence low output. Otherwise i would like to know what size of enclosure you have these spekers on and how they are connected to the amp.