problem with sub

[VanishingImage]

I have a Kicker CompVR 12 with a Kicker 350watt amp. Its bridged to 300-350watts RMS and the sub can handle 400 RMS.

Im hearing this "distortion" sound coming from the sub when its barely hitting notes but still hits hard when the bass notes come in. Both voice coils work,checked both by changing around the speaker wire. This is a pretty new sub,close to about a month old. Havent been abusing it any. It sounds like high pitch notes trying to come through but I have my head unit's built in x-over down to 50hz and my amps built in x-over to like 100 hz. The cone and surround are perfect.

[gerald]

maybe connected backwards? you might have a bad ground too.

[nineteen88ga]

The only thing I could say is make sure you have a secure ground, and the sub is wired propperlyand giving the correct impedance to the amp. Also make sure the amps (if its a multi channel amp, not a momo amp) LPF (low pass filter) is on. I'd turn the X over down a little too...maybe about 80 hz.

If the LPF is on there is no way you should be getting any high frequencies through to the sub.

[CanadAM]

what is LPF Ninteen88ga

[sc02grandam]

lpf = low pass filter

allows only low frequencies to pass through

[Bjornboy81]

Originally posted by nineteen88ga
If the LPF is on there is no way you should be getting any high frequencies through to the sub. with my 12dB/octave LPF I still hear very little higher frequencies. They sound muffled, but they're there. No filter is perfect so you may (and probably will) get some. I can only hear it with the volume down a little, and my head near the driver though...nothing you can hear in the car.

How high of frequencies are you getting through? Is it like the vocals or some high pitched musical notes, like symbols? :)

[CanadAM]

is LPF good? mines like stuck on Off

[Bjornboy81]

You want a low pass filter for a subwoofer....you want to pass only low frequencies to it. It really doesn't matter if the one on the amp is on "off" as long as the one on the headunit is on and low enough (80Hz or so). One thing you do NOT want to do is run a subwoofer with no low pass filter. You will damage it quickly because they are not designed to play high frequencies. :)

[CanadAM]

when i turn it on on my amp my subs produce a constant heatbeet thump???? when off theyre fine

[VanishingImage]

Originally posted by Bjornboy81
with my 12dB/octave LPF I still hear very little higher frequencies. They sound muffled, but they're there. No filter is perfect so you may (and probably will) get some. I can only hear it with the volume down a little, and my head near the driver though...nothing you can hear in the car.

How high of frequencies are you getting through? Is it like the vocals or some high pitched musical notes, like symbols? :)

its more like something is rubbing but then the sound goes away the harder the sub hits. I can stick a finger inside the basket and tap the cone and sounds like something loose but nothing seems to be.

[gerald]

first off, did you buy this sub new?

[VanishingImage]

yea,its about a month old.

[Bjornboy81]

did you break it in or just start beating on it? Subs need a 20 hour (debatable of course) low volume break in time. If you don't you run a chance of hurting it.

[VanishingImage]

oh no, I was easy on it. Even the amp and sub manuals said they had a break in period.

Just weird how the sound goes away when the sub hits hard then when theres very little coming through you can hear it.