then why would the sp4 sound good man, that dont make sense. you guys come off like ass holes just to let you know

How did you design the enclosure?

I didnt i paid someone from Caraudio.com to do it.guy with lots of experience ect,

then why would the sp4 sound good man, that dont make sense. you guys come off like ass holes just to let you know

my install is amazin, wtf are you talking about. you can assume. box is 4 cu tuned to 33 hz and is a very high quality box. there is a big difference between the subs sounds

Can you say Pissed? damn sub fuckin sucks on lows.. i want to sell this crap asap and get another sp4 or btl..

https://www.facebook.com/pages/Fi-Car-Audio/163751923651416?fref=ts

 

 

CONTEST.... for a Fi Car Audio Team series sub. We are giving one away before they go live on the site. We will ship it anywhere in the world.
Contest is simple: We have a Fi Car Audio family member starting a new company and we want to get them to 1000 likes on their facebook page. You will simply go tohttps://www.facebook.com/pages/Silver-State-Cycles/592555637421327 or search for business "Silver State Cycles" and click like. Once you have done that come back to the official "LIKE CONTEST" post and comment "liked". We will select the winner from this list (checking first to make sure they actually liked them ) and allow the winner to choose between 15" or 18", D1 or D2 coils, logo color, and ship it worldwide (so all of our friends outside the US, please join in!!!)

Simple enough? Now click away!

2013 Fi Car Audio Team Sub
4000W RMS
4" extra heavy duty aluminum coil with double reinforced former
Carbon composite dustcap
Extreme roll surround
7 spider pack
Massive linear excursion capability
US Steel machined in house
Optimal flux flow motor
Double stack high flux density magnets

hard to breath, hair trick,  flexing daily lol..thats what i want.

i have a saz 3k, am getting another to strap. but the box is pretty good now and very loud. just was curious about what kinda change i would see.

I have a 4cu box tuned to 33 hz and a sp4 15 in it. if i were to get the hole cut bigger for a sp4 18..what would happen? and is the box too small for the sp4 18 to sound good. btw im in a  pontiac g6

lol fair enough then i guess lol

 

 army? my sister is at hood, finally close to home.

i had family in the army but no not at the moment. just my girl and her family from tx, my side from sc but my mom moved to ky. im just here for a few months then back to tx

How much power was being ran to the sub? OP did you swap your system from another vehicle?

3k rms, no swap to another car.

far from

 

•                             Location:Down South

                         

Im from sc, and i just left killeen tx, will be going back..and it if def down south in ky..cause im southern so i make it southern!!

 

louisville ky

btw like i said earlier i have a tripple stack thats working fine on it right now

at the end of the day man, i know its not the amp, it wasnt the gain being set wrong ect. everything was how it should be and i can verify this cause my tripple stack is still working fine. at the end of the day i have to just buy a recone..it sucks that i have to spend even more money but i dont want to pay to ship the sub to them  ect. on top of that i just took the damn cone out and threw it away. no sense in keeping it.i was told by multiple people, even if its not user error, it will be user error..lool. F' It. new D1 Recone coming soon as i can pay for it i guess..

The filtering is typically done right at the high voltage rails with capacitors and rectification in an A/B amplifier and on the output stage in a class D IIRC. Class A/B doesn't typically present the problems with noise because its fairly easy and inexpensive to filter that signal at that point in the chain with caps and diodes or rectifiers. With class D almost all the filtering has to be done at the ouput stage because the high frequency (square wave I might add) has to go through the output fets thats modulated by the input signal. The inductors knock the edges off the digital part of the signal to make it a sine wave again. The problem there lies in the "cheap" part as high powered inductors that can filter everything as it should be are Not as cheap as caps and diodes/rectifiers. Class D amps work very very similar to a high frequency variable speed motor drive system (I think that's the right name). The difference is that instead if modulating the duty cycle with a constant variable and no need for any filtering an amplifier modulates the duty cycle with the input audio signal and filters the output for playback through a speaker.

Now, I could very very well be off on a few of these details but I think I have remembered the just of it all correctly. For a person to make their own filter bank for a class D amp it would need to consist of a very high power handling inductor with the right millihenry value to not also filter the needed audio signal. Capacitors would also be useful as the entire filter is basically just a high powered LPF in the first place.

I would never suggest anyone actually build this for use in any case by any stretch of the imagination. If you suspect a piece of equipment is malfunctioning you should have it inspected by a capable person. Or if you suspect one to be built cheap then don't buy it and save your money for something more reputable. In any case it takes more than JUST bad or cheap filtering to cause the failures as distortion, installation, program material etc. all play a part in the final signal the speaker sees. Get enough kinks in that chain and failure will be imminent, the same goes for ANYTHING audio related.

To the OP, you said you had a local shop test the amp, what exactly did they do to test it? If all the did was hook it up and listen to it play they didn't really test it. At the minimum they would have needed to put an oscilloscope on it to verify there was absolutely no DC in the output and the high frequency the amps power supply switches at is WAY above anything audible (in most cases) and even if it were in the audible range you'd never hear it because the natural inductance of a subs coils would filter it down anyway and it may not even be a high enough level to be heard over the music signal. Test equipment would be the only way to know its there and just because you can't hear it doesn't mean it can't potentially do damage.

Shizz, building a filter bank from a coil and caps would really only be useful for inquisitive testing purposes and ideally only with an amp that had known noise issues. I think the vast majority output clean enough signals that they never cause a problem. It's the rare odd case where all the wrong things happened at the wrong time for a long enough time frame to lead to this kind of failure.

according to them they opend it up, looked for damage, checked some other stuff but said everything is perfect 

had the amp looked at today by a local shop, no problems were found.so idk. guess im just out of a sub for now until i can pay for a recone..

He said "...they...".

they meaning the coils.. sorry

Im not sure about what that post had in it. I have had so many subs man, and this have never happend. and i have seen when a clipped signal cause damage to a sub, it locks up ect, no sound. the damn sub still was working fine, while the spiders were burning man.. it was not because of clipped power, i dont use bass boost and my box is 4 cu tuned to 33 hz and my subsonic filter was at 29 Hz..I just hope that someone here has a good enough heart to do the right thing, and i work in customer service so i know how much it would affect the outlook of the company. I love Fi, no doubt about it. i wish i could run all fi equipment.. and the logo is so damn sick i want to rock a black t shirt with the logo on it lol..but come on guys something was not right with the sub..

What was the ohm load the subs were wired for?

1 ohm as they are d2

SP4's do not have sandwiched leads, they are sewn on the top spider inbetween the spacer, aside from that there is nothing wrong with sandwiched leads to begin with.

 

Sub-par amplifiers shooting ultra high radio frequency noise will cause the tinsel leads to glow..if it's not filtered out.

 

Speakers do what you tell them to do, no matter what..it is an input device that takes whatever you give it, and makes it into sound.

 

Email me your contact info and i'll try to give you a call this evening and go over some stuff with you. In the meantime, watch the video.

 

Edit: I would also get your amplifier checked out, that looks like the end result of several of those 3000d's i've seen issues with. It looks like straight DC voltage to me.

 

[email protected]

Im not sure about what that post had in it. I have had so many subs man, and this have never happend. and i have seen when a clipped signal cause damage to a sub, it locks up ect, no sound. the damn sub still was working fine, while the spiders were burning man.. it was not because of clipped power, i dont use bass boost and my box is 4 cu tuned to 33 hz and my subsonic filter was at 29 Hz..I just hope that someone here has a good enough heart to do the right thing, and i work in customer service so i know how much it would affect the outlook of the company. I love Fi, no doubt about it. i wish i could run all fi equipment.. and the logo is so damn sick i want to rock a black t shirt with the logo on it lol..but come on guys something was not right with the sub..

idk if this matters or not but on the tensils where it has the rubber coating around it (i guess to keep the 2 from touching) mine only had it on 3 out of the 4. not saying that caused the problem but it did catch my attention.

Try to see if you can measure DC voltage through the speaker outputs when you are playing a (few) song(s).

what would that prove if i can..the sub did still play but the spider was burned to hell

how do i remove the damn spider spacer man..but i dont think this was my fault honestly.

 

gotta love those sandwiched leads

according to your proflie you love making music? im  a producer..work with plenty of artist in the industry..

 

Yeah its a hobby.

Music industry is so saturated right now and with anything its not what you know, but who you know.

 

http://www.youtube.com/user/djjdnap

 

You wouldn't happen to have a sister as well would u? lmao j/k

lmao

 

http://www.youtube.com/benbenondatrack  im checking you out aswell

gotta love those sandwiched leads

according to your proflie you love making music? im  a producer..work with plenty of artist in the industry..