ive been driving around with my new 12" MT, and ive been playing it for about 15 hrs now, and i have been noticing a very loud slapping right behind hte dust cone at any volume. Of course, the slapping gets louder the more excersion the sub produces. I am running 1200RMS to it for now, then more later, just wanna break it in. What is the slapping, and will it stop, can it be fixed?
take the sub out of the box and run it in free-air...watch it and see it the lead wires are hitting the back on the cone or the spider when the sub moves.
if they are not hitting the cone or spider...you could have a loose dust-cap.
marshal could you explain lead slap more. what exactly is happening and why would it be happening?... this seems similar to the situation of my avalanche
What kind of box do you have? What amp? What is your MT's configuration? I have 15" MT and no problem what so ever. It took a lot more than 15 hours with mine. For 3-4 weeks, the bass wasn't as accurate nor smooth. Now it's starting to produce deeper and clearer bass. It's not a SQ sub, but it sure sounds better than lot of other subs at high volume.
lead-slap is basically when the tinsel leads on your sub hit the cone or spider when the speaker moves...this usually happens when you push the sub too far excursion wise (ex: you play a 25hz tone to a sub in a box tuned to 32hz w/ no subsonic filter)
oh okay then thats not what was happening to my avalanche.. i had ti in a sealed box and i would play rap music not tests which im sure none of it goes that low. besides. there would be no reason for it to do that out of no where right? because it used to sound great. plus its not as loud... conclusion: blown
Push up on the cone far enough untill you can see a good chunk of the voice coil. If anything's wrong with it, it should be pretty noticeable, if you know what your looking for.
Use a dmm on the voice coils and make sure there is current flow.
When your lookint at the voice coils, just look carefully at the strands. Make sure none look melted or broken off and strayed out from the winding. When you blow a sub it's pretty noticeable. The voice coils are all melted and usually burn through the dust cap.