Subwoofer thumps once when car is turned on. amp overheated and melted some time ago and I tried repairing (changed all the melted transistors) and since than the sub only thumps once when turned on. Im not sure if its the amp or is the sub blown. a best buy installer attempted to connect a 1000watt rockford amp to the sub and didnt get anything. he tried telling me that the sub is blown... I highly doubt that the amp is strong enough to run the subwoofer. am I right to assume that or is the subwoofer really blown.
Try pluging in a diff, speaker to the amp see if u get sound.try powering the sub with a home radio just to see if u get sound at all if ur getting sound from the sub then its the amp but u could of damaged it when the amp over heated
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