fla 9 Posted December 20, 2016 I recently installed a bass tube in the boot. Only 8" as I needed it just as a sound stage filler. It 'seemed' to work intermittently until I removed and checked that the cone made a sort of rubbing noise but when pressed from one side it was fine. The cone hasn't become detached from the centre coil but it seems that if it could be 'dropped' on one side it will be fine. A bit hard to describe but welcome anyone's solutions. It's not been overdriven - I think I'm a bit beyond the panel shaking bass! Quote Share this post Link to post Share on other sites
marks2 0 Posted December 20, 2016 For the voice coil to rub on the pole piece either - The speaker has been subject to an impact and the magnet assembly has shifted in relation to the voice coil. Unless the magnet assembly is bolted to the speaker basket (i've never seen this on car speakers) there's not a lot you can do. - The speaker has been over driven and the voice coil has distorted; again not a-lot you can do. - The suspension has sagged due to age. Try turning the speaker through 180 degrees. This is an old trick used in vintage hi-fi. Are you sure that you are pushing squarely on the cone? Sideways pressure can result in the voice coil not travelling parallel to the pole piece. Quote Share this post Link to post Share on other sites
fla 9 Posted December 20, 2016 I'll try the 180 degree trick. Thanks. Would be annoying if its failed. Quote Share this post Link to post Share on other sites
fla 9 Posted December 24, 2016 I've left this vertically in front of the radiator for a few days as you're right the voice coil is not running parallel. This is to see if the heat will help realign it. If not I'm thinking of puttung some weight on one side. This is where i press the cone to make the coil not rub and it then sounds absolutely fine. Quote Share this post Link to post Share on other sites
fla 9 Posted April 22, 2017 Got it replaced under warranty so all ok now Quote Share this post Link to post Share on other sites
