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<blockquote data-quote="Lasherž" data-source="post: 8711498" data-attributes="member: 679555"><p>A quick and easy way to check for a blown subwoofer is to put a battery between the terminals and listen for a thump. If there&#039;s no thump then disconnect it and measure the ohms without the amp, it should be 2/3 to 3/4 of the impedance rating of the speaker. If that&#039;s testing alright then make sure your channels aren&#039;t swapped on the input for the mono channel and make sure internally to the enclosure the voice coils aren&#039;t wired opposite of each other if it&#039;s a DVC sub. Opposite channel interference can happen on an LOC pretty easily and the signal will cancel itself out. A common symptom of this is that it gets louder when you disconnect one of the RCA cables. Other than that I&#039;d recommend using ohms law to set the gains for the subwoofer without the sub attached, it should be pretty clear at that point whether the channel functions or not.</p></blockquote><p></p>

[QUOTE="Lasherž, post: 8711498, member: 679555"] A quick and easy way to check for a blown subwoofer is to put a battery between the terminals and listen for a thump. If there's no thump then disconnect it and measure the ohms without the amp, it should be 2/3 to 3/4 of the impedance rating of the speaker. If that's testing alright then make sure your channels aren't swapped on the input for the mono channel and make sure internally to the enclosure the voice coils aren't wired opposite of each other if it's a DVC sub. Opposite channel interference can happen on an LOC pretty easily and the signal will cancel itself out. A common symptom of this is that it gets louder when you disconnect one of the RCA cables. Other than that I'd recommend using ohms law to set the gains for the subwoofer without the sub attached, it should be pretty clear at that point whether the channel functions or not. [/QUOTE]

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