amp making the sub sound bad???

[Xprime4 10+ year member]

Hi there,

The problem: my fiQ 18 is making weird mechanical noise when hooked to a ma audio overrated an sucky amp

http://www.sonicelectronix.com/item_2680_--+FINAL+CLOSEOUT+--+MA+Audio+M1889I.html

supposed to give 800watt @ 2ohm but i've seen 400watt amp doing better anyway this is the amp. That amp is hooked on a 12v converter, which is a computer psu. Talk about gettho setup //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif I never had problem with it in my room though.

The sub is making the mechanical noise if you put you ear next to it. seems to be coming from the dustcap. It is really disgusting and killing the sound of the q. I know the box got nothing to do with that coz it's making the noise free air too.

When i'm unplugging the sub and pushing the cone, everything is fine. no rattling noise of any kind. But the first time i tried pushing the cone the scratching was there:crap: after playing aroudn a little it was gone //content.invisioncic.com/y282845/emoticons/wow.gif.23d729408e9177caa2a0ed6a2ba6588e.gif

My dmm is ****ed up and giving different result every time i check the coil noise. but it's doing that with all my stuff (time for a new one, anyway)

So my first reaction was like **** the coils are gone for no reason. I tried hooking it up to my bxi2006d in my car free air and everything sound fine....//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

My second reaction was "yeah time to get something better" //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif. I'm broke tough //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif i did some more testing with another pionner cheapo sub at 2ohm and it sound perfect with the same ma audio amp... so now i'm ****ing confused....

with the Q, i'm running the amp at 1ohm, which is not supposed to work but it does anyway. I use to run that same amp in my car for like 3 weeks with the same sub and there was no noise or shutdown or anything that could let me think the amp is not able to do 1ohm.

But is it possible that, now... for no reason.... the amp ain't making the sub sound good. I mean, i can get loud (i expect aroudn 240watt from this setup with 22a rail psu) but sound like if the sub was broken???? is this well known? amp making the sub sound bad? it really sound like if the sub was scratching while moving, while with another amp it sound nice. BUT on the "defective" ma audio amp at 2ohm with another sub , it sound ok //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

I just bough a g31 battery and a new substage... i can't affort to pay for an amp if it isn't the problem

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[Rashaddd 5,000+ posts]

does it sound like coil rub possibly? I had an amp being run off a power supply that would clip so bad at high volumes that it sounded like the coil was rubbing, not clipping

took the sub out to my car and hooked it up to more/clean power and it sounded fine //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif took me a while to figure out that it was just clipping that bad

 

[Xprime4 10+ year member]

well the mechanical noise is there at extremly low level too. so i don't think it's clipping

 

[Rashaddd 5,000+ posts]

how extremely low

mine was also only doing it at certain frequencies

 

[Xprime4 10+ year member]

I must add that the noise is more audible at low level then high level, when the bass overpower it a little.... problem is that i'm not giving the sub a lot of power 90% of the time

 

[Rashaddd 5,000+ posts]

I must add that the noise is more audible at low level then high level, when the bass overpower it a little.... problem is that i'm not giving the sub a lot of power 90% of the time

could the cap be loose? inspect the build of the sub as much as you can and make sure nothing could be vibrating or loose

 

[Xprime4 10+ year member]

extremly low... like you put you hand on the sub and almost don't feel it moving. The noise sound seems to be louder at the dustcap. I haven't check with all the freq tough but on music and with a 20hz tone the noise was there

 

[Xprime4 10+ year member]

could the cap be loose? inspect the build of the sub as much as you can and make sure nothing could be vibrating or loose

wow you're responding so fast //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif

no sub is in perfect shape. dustcap is well stick to the rest of the sub. spider, tinsel... everything visible looks ok...

was surprise my the most i the first time i push the cone after i discover the problem... there was a scracthing noise like if the coils were gone... but after playing with it a little ... the same exact noise was gone while pushing with my hand //content.invisioncic.com/y282845/emoticons/wow.gif.23d729408e9177caa2a0ed6a2ba6588e.gif:wow:

now it doesn,t make any bad noise except when hooked to that particular amp. But like i said, at 2ohm the amp works fine, at least from my quick test

I'm really worried. i don't give a **** if it's the amp, but please god leave my sub alone!!!

 

[Xprime4 10+ year member]

no one experiment a similar problem //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

 

[Xprime4 10+ year member]

bump