My subwoofer is blown... what to do?

[JBL4645]

Originally Posted by TheZoof

JBL - Thanks for the reply.

Well the thing is I don't even need to have a source and it is seems blown. If I just plug it in the wall and turn it on(no wire hooked up) and it is in 'standby mode' it makes pulses over and over... (bass sounds).

The funny thing is that when it goes into active mode it seems to work fine but all of a sudden it will make extremely loud crackle sound and go out of range(top out) and come back again... it could have been just because the movie only needed it at that time and it would make that sound anytime it was needed... but not sure.

TheZoof

Yeah your amp has had it! At least from what you say the sub bass driver may be intact. So it could be used in future DIY sub, no I’m not trying to be funny.

If you’re having bass issues from the start with less bass chances are you where in the (null zone) it’s a spot where certain low frequencies just won’t sound loud, this forces you or anyone else for that matter to turn it up! The frequency from within the sub is fine but its going to be and most other frequencies be pushed to the limit of its technical tolerance.

I feel comfortable knowing this because if I was aware I’d be making post like this. They make wonderful software tools for registered members at Home Theatre Shack like (REW) Room EQ Wizard, which is free and will see if you have issues.

You start running films/DVD/Bluray/laserdisc what ever with little knowing of what is physically happening to the speakers chances are you’ll run into a few blown drivers, thou subs seems common enough for the home today.

Very few threads where someone moans about blow tweeters because they where playing it at 105db from 3 meters away when it should be (85db which is deemed safe for 8 hours human consumption).

Anyway you learn from each mistake and don’t repeat it.