Subs Keep blowing

[COMMY VP 666]

hey my subs keep stuffing up

what can cause them to stuff up, the amp is still fairly new, and there new subs?

[DVOLVO]

Do you have the filter turn on so your only getting bass..

[SweetWagon]

Did you match the specs of the subs to suit your amp?
Are they wired correctly?
Post up model numbers of your amp and subs, makes it easier to help with these problems

[COMMY VP 666]

there wired correctly, not sure about filter, so if you have the filter off its badd?

[trentvy]

depends if its low pass or high pass

[Mike S]

Most amps will have a low pass filter, but even if your running the subs in full range mode it shouldn't damage them. The most likely cause is either your under powering your speakers or they are wired incorrectly, meaning that the amp amy be seeing too low a resistance.

We need to know what gear you have then someone can help you set it up.

[COMMY VP 666]

hey true

when engine off i have 12.4volts at battery and amp
when engine on i have 14.1volts at batter and amp i have 14.0 volts

my amp is a kenwood KAC - 81004D , 1000Watt, class d, mono power
my sub is a US Audio 15inch sub

[SweetWagon]

Ok so specs on that amp is

300W x 1 at 4ohms
500W x 1 at 2ohms

Cant find specs on that sub, Whats the impedance ie 2Ohm/4Ohm?
single or dual voice coils?
Wrms rating?

[Mike S]

Your amp and sub should work fine if the sub is a 4 Ohm or 2 Ohm type and I'm not familiar with the US Audio range so I'm assuming it's not a dual 2 Ohm sub and you have it running at 1 Ohm which is too low for your amp. Take the wires to the sub off the amp and measure the resistance across them with a mulimeter, if you havnt got one im sure one of your mates will, it must read 2 Ohms or higher.

[COMMY VP 666]

im just going to put my other sub in, another us audio 15inch

and turn the settings down, but where should my rca's go, line in or line out

also i have a setting ISF, it can either be off, 15hz or 25hz

[SweetWagon]

http://images.kenwood.eu/files/prod/...-8104D(EN).pdf

explains everything

[COMMY VP 666]

hey that does help, but for the infrsonic filter switch, what do you think i should have that on, so i dont blow the sub up again

[SweetWagon]

I don't think that will make a difference. But the LPF should be around 80, and the gain set accordingly. The cause of your troubles lies elsewhere, You need to post the specs of the sub (usually written on the back of the sub) as its likely they are being overpowered and clipping.

[Mike S]

Set your subsonic filter to 15 or 25 htz, it stops the sub trying to produce sounds that the human ear can't hear anyway. A 15" sub should have a good bass extension at low frequencies, set your LPF at 50hz, although it's a personal preference and depends on your own taste.

You havn't actually told us what goes wrong with your sub ...... what does "stuffing up" mean?.

[cewing]

check you've wired it correctly in parallel, and ensure that the sum of your speakers impedence is close to the rms rating of the amp.
Ie: If your amp says 500rms @ 2ohm load, and your subwoofers are 4 ohms/250Wrms each, wiring them in parallel will mean they each get 250Wrms, which is what the amp will supply perfectly

[holdenboy]

Also, what type of enclosure is the subwoofer in?

A sealed enclosure will have no holes (ports) while a ported one will have a port/s.

Maybe its a tuning issue (the port/s are tuned above the music the sub plays).