sub dosn't sound right - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 07-30-2006
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sub dosn't sound right

I just finished the box just have to wrap it and i tested it out and the sub sounds disstorted so i was wondering would the poly fiber stuffing help fix the nosie?
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Old 07-30-2006
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Adjust the Gain, is it kinda gurgling and distorted? thats all gain( on the Amp)
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Old 07-30-2006
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does it have a crossover?
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Old 07-30-2006
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How about this... I over-amp all my speakers so I can turn the gain down. The only thing the Gain does is amplifies the wave, it doesn't give the subwoofer any "real" power.

You should turn the gain down and try to aim the crossover on your amp/HU (if it has one) around 80-100hz.

If you want, you can stuff it, but it won't help the noise. The amp will last longer if you stuff it right, becuase what the stuffing does is it lowers the Impedance curve (which can go as high as 20 ohms) and lowers the amount of stress put on the amp.

The correct way to stuff a box is to put a couple handfuls in the box and run a slow sweep through the suwoofer measuring/monitoring the impedance curve with a multimeter or computer. Then keep adding/sutracting stuffing till you get the flatest Impedace curve you can get...

Now that I've blown your heads up... your welcome.
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Old 07-30-2006
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so basicly stuffing it would help but all i have to do is play with the amp and get it right. so i have a double chanel amp with eight **** how do i know what to turn up and down to get it right
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  #6  
Old 07-30-2006
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Quote:
Originally Posted by rolla_guy72
The amp will last longer if you stuff it right, becuase what the stuffing does is it lowers the Impedance curve (which can go as high as 20 ohms) and lowers the amount of stress put on the amp.

The correct way to stuff a box is to put a couple handfuls in the box and run a slow sweep through the suwoofer measuring/monitoring the impedance curve with a multimeter or computer. Then keep adding/sutracting stuffing till you get the flatest Impedace curve you can get...

Now that I've blown your heads up... your welcome.
Wow, who told you that lie? The main purpose for adding polyfill to an encloser is to assist when making sealed boxes in small spaces. The polyfill slows down the acoustic waves, it now takes longer for the sound waves to reach the back of the box, fooling the sub into thinking it is in a larger encloser... Has nothing at all to do with the impedance.

Last edited by Wrongway; 07-30-2006 at 10:17 PM.
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  #7  
Old 07-30-2006
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If you follow this you should be good. (taken from crutchfield website)

Q: How do I fine-tune my amplifier's gain and bass boost settings?

A: Setting the "gain" or input sensitivity control is an important adjustment common to all amplifier installations. Proper gain setting helps reduce noise and distortion and allows for the widest possible dynamic range. Here's how to do it:

Turn your amplifier's input level controls all the way down.
Put in a tape or CD or tune in a radio station. Turn up your receiver's volume control. You'll begin to hear music at faint levels. (Audiophiles and sound competitors may want to use a dedicated test disc.
When you start hearing distortion, lower your receiver's volume control until the distortion disappears. At this point, you have as much signal as possible passing from your receiver into your amp. (This gives you maximum signal-to-noise ratio, so you'll enjoy clean sound and your system will be less prone to engine noise problems).
Now begin adjusting your amp's input gain. Turn the input level controls up until the system is as loud as you can stand it or until you begin hearing distortion whichever comes first. If you hear distortion, decrease the gain settings slightly.
By following this procedure, you'll optimize your amp's performance at the receiver's maximum volume level, so you can crank your system almost all the way up without amplifying any distortion, or damaging your speakers. Keep in mind that this adjustment does not affect the power output of the amp you're simply setting the amount of input signal needed for optimum sound quality from your system.

Car stereo competitors sometimes employ a technique called "gain overlap" to wring some more dBs out of their rigs while keeping distortion out of the audible range. Many amplifiers have a bass boost function. In most cases, it is a variable control you simply dial in the amount of boost you'd like to hear. Bass boost levels can range from +6dB to +18dB, depending on the amplifier. As you experiment with this adjustment, you'll notice that the boost is centered at a given frequency, so you'll still experience some bass boosting at frequencies above and below that point. Make sure that your system is turned off or operating at low volumes when you engage or turn up your bass boost control boosting bass at high volumes can damage your speakers.
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Old 07-30-2006
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Amplifiers don't give a rat's butt if the box is polyfilled or not.

About the original poster, how about pics of the box? Sealed or ported? It's very easy to screw up a ported box. Check crossover points as stated above. More details on how you have it hooked up may help too.
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  #9  
Old 07-31-2006
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Quote:
Originally Posted by Splash
so basicly stuffing it would help but all i have to do is play with the amp and get it right. so i have a double chanel amp with eight **** how do i know what to turn up and down to get it right
I said quite the opposite... I said the stuffing won't do anything.
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  #10  
Old 07-31-2006
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Ok I'm an *******.. I can live with that. But your still wrong on this one buddy. polyfill in the box does not effect the amp in anyway. does not effect any "impendance curve" and you do not need a multimeter to get this connected correctly.
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  #11  
Old 07-31-2006
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Please play nice. Your all making yourselves look like children calling eachother names over a speaker.
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  #12  
Old 07-31-2006
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Quote:
Originally Posted by Wrongway
The main purpose for adding polyfill to an encloser is to assist when making sealed boxes in small spaces. The polyfill slows down the acoustic waves, it now takes longer for the sound waves to reach the back of the box, fooling the sub into thinking it is in a larger encloser.

^^^ Just agreeing, my .02, not arguing with anybody
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Old 07-31-2006
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Alright you win, but I'm telling you it does, it's been done in SQ competition vehicles in the the door panels for small enclosures where the impedance peaks. I never said he should do it, nor did I say that was his problem. i was just saying that you can control impedance peaks with the correct amount of polyfill, stuffing, fiberglass insulation, etc.
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  #14  
Old 07-31-2006
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I'm still wondering how impedence curves and SQ Competition vehicles would help the original question?

I appreciate your enthuiasm, but let's focus more on helping to answer Splash's question than impressing. If you'd like to open up threads on advanced audio theories and concepts, be my guest.
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  #15  
Old 07-31-2006
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it just kinda veered off, I'm sorry. i thought I gave my answer in my first post along with a bit of tech...
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