Bass Cracking And Poping

[HAZED]

i was booming my system and heard a crack and poping sound coming from the speakers any one know whats wrong i checked and double check wiring everything looks good hoocked up!!! :(

[jamcllw]

sounds like you fried the voice coil

[HAZED]

only doing it on certian bass notes........!

[bigd6983]

which speaker? a sub? or stock speakers? more than likely its blown but check ur bass gain maybe its too much for the stock or aftermarket speakers to handle.....

[Screamin eagle]

I've seen the little circle in the middle of the cone come loose on certain subs. A little glue fixes it sometimes.........Kind of ghetto but it beats buying a new sub.

[mike2002]

could be the sub bottoming out from either to much power, to big of a port etc etc....ported or sealed box? what kind of subs? dimensions of box/port(s) ? what amp?

[mikegett]

Originally posted by mike2002@Feb 26 2005, 08:09 AM
could be the sub bottoming out from either to much power, to big of a port etc etc....ported or sealed box? what kind of subs? dimensions of box/port(s) ? what amp?
Dido. And check to ensure that your crossover is correct. If you aren't limiting subsonic frequencies it could easily be hitting a note that the cone excursion can't handle. This will tend to sound like a very drawn out note. Too much power will sound like a pop on the speaker only vibrating. Your gains can cause this as well. If you have the gain set over the limit of your HU or amp, distorition will be introduced. This will sound like back crackling or poping. Most notably with the amp on lower notes that require more wattage. A HU gain will be constant at the volume.

[HAZED]

jl audio 500 1 also ae12w6 ported as well
500 W RMS x 1 @ 1.5 ohm-4 ohm
• THD <0.05% @ 4 ohm
• 5 Hz-500 Hz (+0, -1dB)
• On-board Crossover fully-variable (50 Hz-5 KHz)
• Accept up to 4ga. Wire
• 13.4"L x 9.25"W x 2.36"H

[HAZED]

AND.........AE JL AUDIO 12w6
http://jlaudio.com/subwoofers/pdfs/10_12W6AE_MAN.pdf

[mikegett]

I don't realy understand the amplifiers rms. I assume that it must have a variable powersupply to achieve 500 watts rms through 1.5 to four ohms. If so, then you may be overdriving the sub. The recomendations for your sub is around 300 watts RMS. At five and six hundred they state long term reliability will be compromised. How do you have the gains adjusted? You should also concider turning on the subsonic filter. That is a nice sub, but the excursion is only .45 inches one way. Frequencies under 20Hz at a resonable wattage could easily hurt the coil.

[mike2002]

^^^like he said, your overpowering the sub. i assume your box is a vented box, and its the one they recommend? your sub is over-excusioning (is that a word? lol) subs in ported enclosures cant take as much power as subs in sealed ones. in ported box, that amp has enough power to push 2 of those subs very well. also, do you have the bass boost cranked up? im not familiar with that amp, but if it has a subsonic filter, set that to about 30hz and your sub will take a little more power before bottoming out

id get another sub, you've already got the power

[HAZED]

http://jlaudio.com/amps/pdfs/500_1.pdf
can this help u out
http://jlaudio.com/amps/pdfs/Switches_Knobs.pdf

[HAZED]

http://jlaudio.com/amps/pdfs/Switches_Knobs.pdf

[bigd6983]

yea you are just over powering it more than likely......you can just turn the gain down on ur amp and that will be fine, or you can try another amp, something at like 300 watts rms........more than likely that jl audio amp is under rated meaning its putting out atleast the wattage it says if not a lil more........compared to other amps that are over rated and dont put out as much power as it says it does.....so not only are you over powering it, but with a nice amp too......so yea, to things.........new amp.......or just turn the gain way down on that one and you should be good 2 go.......wait theres a 3rd........grab another sub lol

[doubleN0alero]

how about turning the volume down? Damn, you kids these days, you'll be deaf by the time you're 30...LOL

[mikegett]

Post what HU have and where you set the amp gains. Before touching any of your current gains, try looking at your amp with JL's tip 5 on the pdf. Turn off your bass boost. Try out your cd that has the problems. If it fixed the problem then great. If not, turn on the infrasonic filter. You want it set to High pass so that the lower frequencies are blocked. Set the knob to 20Hz and test out the cd. If you still hear it, then adjust the frequency between 20 and 30Hz. I realy believe this to be your problem. Lower frequencies need a long excursion on the subwoofer or it will bottom out. Kind of making a long thuding sound. If these don't work, we will see about adjusting the gains. Here is a question. Does your noise come about in low volumes or at high volumes. If you hear the noise at low volumes then the sub is bottoming out.

[HAZED]

i have an alpine older model i belive it was 2002but anyways im looking for it online so i can post it for yall no i dont get that noise when i have my volume low

[mike2002]

turn your subsonic on and set it to 30, are you using bass boost? how much and what frequency? you shouldn't need any boost like mike said......if your hard up for bass, buy another of the same exact sub

[HAZED]

in about ten min im going to run to the car and take a quick shot hope it aint cooled later update...... yah got it at +13 bass boost

[mike2002]

thats alot of boost for that amp on 1 sub......

whats the boost centered at?

is your subsonic on?

every 3 db of boost takes double the power, you need to turn that boost doooooown, if you do that, you may have to turn up the gain to compensate, but its safer

you will eventually (soon) deystroy your sub and have to get another one, might as well get it now and run 2 subs....lol

[HAZED]

:D i got two sub running theres is no subsonic on there and the center is set to 25
the Q is set to 1.6 and the amp lp filter is 12db and set to 55 i hope this helps

[mike2002]

Originally posted by HAZED@Mar 3 2005, 09:31 PM
:D i got two sub runningÂ;-) theres is no subsonic on there and the center is set to 25
the Q is set to 1.6 and the amp lp filter is 12db and set to 55 i hope this helps
ok, then you have a couple of easily fixed problems

1st, you need to set your subsonic (JL calls it infrasonic). right now your sending power for frequencies that your sub cant really play. wasted power, and its hurting your subs. id set the subsonic to 30hz, that way it wont get any frequencies below 30hz. you will still get some frequencies below 30hz, just at a reduced power. you could get away without one in a sealed box, but not with a ported box. the subs can bottom out MUCH easier in a ported box

next, your biggest problem by far is your bass boost. you doing 12db at 25hz, thats a boost of 4x the normal power at a very very very low frequency, which is why your subs crackle. turn this up to 45hz, dont go any lower than 40 hz. also turn it down some, i wouldn't do more than 9db. if its not loud enough, turn up the gain some. alot of people dont relieze how low 25hz really is, most songs dont play that low for a reason.

also, id set the low pass for 24db insteade of 12db, at 85hz, or just a hair under that, but 85 should be good. by doing 55hz your missing some of the sub-midbass that your subs are capable of playing. basically what the 12db and 24db mean, is how "fast" the crossover reacts. you will still get power above 85hz, but it goes down by 12 db every octave, or 24 db every octave depending on what you switch it too.

[mike2002]

oh, and the Q should be fine where its at, you can expiriment with turning up to the next line, or down to the next one, but i wouldn't go more than 1 line away from where you are now

[HAZED]

ok let get this right Q is fine right......
then set the bass boost to 24 at 85
then the center to 45
just moving the freq to 30 made a big dif in the sound no more cracking just havend hade a chanse to change the rest till i take a ride to the store

[mike2002]

Originally posted by HAZED@Mar 3 2005, 10:18 PM
ok let get this right Q is fine right......
then set the bass boost to 24 at 85
then the center to 45
just moving the freq to 30 made a big dif in the sound no more cracking just havend hade a chanse to change the rest till i take a ride to the store
Q is good
turn "infrasonic" to on, set it to 30hz
"center freq" to 45 hz
"bass boost" will work where it is at 12db, but id go to 9db

then, under the section that says "AMP LP FILTER"
"mode/slope" to 24
"filter frequency" to 80-85hz

"bass eq" on

you should be set with that

[HAZED]

GREAT... did that im about to leave in a bit for work so i should give it a try thanks for all your help mike :thumbsup:

[HAZED]

:thumbsup: worked great