Blown Speaker?

[superman0604]

I have a subwoofer that goes to my surround sound system for my home. ( I know this is car audio but anyways) It shows that the sub is getting a signal and the sub moves but it has no sound. Is it blown or is there something else wrong with it. Thanks for the help.

[CBFryman]

WTF? the cone moves but there is no sound? thats impossible. unless you have the sub out of an enclosure where you are allowing for cancelation...a woofer will make a scratching nouse and will become very distorted and will often burn the coils when it begins to blow.

[superman0604]

Its in an enclosure and it moves but there is no bass. The sub box has lights on the front that show the signal but it makes no sound.

[sr20de4evr]

check the rca connections, you might have a loose connection or a partial short, which is sending a very very low frequency voltage. I've had it happen before

[Mannyb18b]

On my audiobahn manual ( i know) it explains when wiring what happens if the woofers are moving and there are no sound that it is out of phase. ? i dunno, thats what it says

[Mannyb18b]

I thought that when the woofer is moving but no sound is coming out from it, that it means you have to switch the polarity? i dunno, thats what i heard

[sr20de4evr]

if you have 2 subwoofers and they are wired out of phase (one is normal, one is reverse) then yes they will be moving but you will have little to no output. If you only have 1 sub that's not the problem, because it can't be wired out of phase with itself (well if it's a dvc it can, but then the cone wouldn't move at all, if the cone is moving then that's not the problem).

[superman0604]

I will check the cables and all the connections and let you know if it works. Thanks for all the help

[Mannyb18b]

I thought that when the woofer is moving and there is no sound coming from it, that you have to reverse the polarity on the speaker? I dunno, thats what one of my manuals said

[sr20de4evr]

like I said above, if you have 2 speakers and they're wired out of phase then yes that will happen. Basically what that means is that while one sub is pushing out, the other is pulling in, and the sound waves cancel each other out almost entirely. If you have only one sub that's not physically possible, you can't have one half of the sub moving out and the other half moving in to cause cancellation like that. If it's a dvc you can have the coils wired out of phase, but if you do that the cancellation is at the electromagnetic level, and the sub's cone never moves in the first place. If there is 1 sub and it's moving but you can't hear it, then 9 times out of 10 that means it's playing at a subsonic frequency. One of the main causes of this spontaneously happening is a kink or a short in the rcas.

[Mannyb18b]

whoa, sorry about the 3 times thing. i was writing that on a computer thats was screwing up. my bad