Weird rattle noise, input would be appreciated.

[audio4life69]

I am wondering if one of my voice coils is possibly blown. I have dual Rockford P3s I was driving home today and it is about 0 degrees for the last week here in Minnesota. I warmed them up and didnt play anything loud for about 15 minutes maybe longer. When a mid bass part came the subs made a very weird noise like there was nothing there. Then i started smelling something so I was like oh ****... so anyway pulled off checked them with music playing. My left one was making this rattle noise like something metal making noise. Was not right. Got home took the problem sub out and the cone is fine, no cracks etc. I checked my voice coils with a multimeter. Both coils come to 3.4 ohms each. Is this normal for DVC 4 ohm sub? or is that low? Also when I push on cone up or down no grinding noise like a lot of people say for blown subs. I have no clue what else could be wrong with it, but i am notttt an expert. Ideas and input would be greatly appreciated. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

And no I am not over powering these subs. They are getting exact spec power maybe little less even, and i have had for 5-6 months now and no problems.

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[jrdnhsnbrg 10+ year member]

Spiders?

 

[basswiigee]

sounds like spider seperation....

 

[audio4life69]

Spider is still in tact and no rips or tears or anything.

 

[Side Show 10+ year member]

voice coil cooked, how are your subs wired up? also what box and how much pwr? have you set your gain HPF/LPF @ bass boost correctly? do you use one of those bass knobs?

 

[Side Show 10+ year member]

your subs should be trying to play midbass or fullrange music (subs are for 100hz/80hz and below)

 

[hispls 5,000+ posts]

Are you sure the noise isn't from the box or something nearby? Play some test tones into the sub outside the box and see if noise exists and if you can locate the source.

 

[audio4life69]

I have them at 1 ohm on a 1200rms Rockford amp. I have gain set little over half but have lower than that usually on bass knob (have bass boost off, just use knob to lower how hard it hits from actual gain) The subs can play with amp at 80% just fine but then bass is way louder than my speakers (stock, ik ik....) But i checked my box, no cracks or anything and is still just like the day i got it. Subs call for 1.79 cu ft per sub if i recall and my box is 1.76 and is ported. And my subs are playing 125hz and under and then speakers playing 125hz up. Would have set that to 100hz but like i said im on stock and my speakers get iffy at the 50/60 volume with any bass otherwise sound good.

just a 17 year old trying to have cheap but good tunes. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Side Show 10+ year member]

take them both out, test each one by itself.... i'd say one of the woofers has a blown voice coil possibly from the high frequency range.

I have my LPF always set at 80 or even 63

 

[BrownVanMan 10+ year member]

could also be a unwound coil

 

[audio4life69]

Ok I will try that, will the sub still play fine with a burnt/unwound coil? because today driving to school I had it at 40/60 and it was hitting just fine, wouldnt a burnt coil make it hit a lot less hard?

 

[bbeljefe]

What head unit are you using? How did you set the gain? When you set gain, was the subwoofer knob all the way up?

 

[audio4life69]

My gain is at like 65% but i have bass knob (bass boost is turned off so just controlls my gain) usually turned down so my gain is more like 55% usually. I had my subs playing 125hz and lower but now I changed it to 100hz and lower. The rattle quit now that the temperature went up 15 degrees (daytime high is now around 10 degrees vs -5) Could that have made it do it?