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  #1  
Old 05-06-2012, 08:22 PM
genious 7 genious 7 is offline
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Exclamation SP2200 Crackling

Well, what can I say, my SP2200 is exhibiting crackling noises. The issue is that I live in Panama, and paying shipping won't justify itself. What I want to know is what is the cause of this.

I mean, the ROOT cause of it, as this is obviously not the first issue of this kind. Please tell me what the most common real issue is; external or internal. Please don't tell me check connectors and RMA; I know how to solder and am willing to open the speakers up if a known cause exists.

(Yea, I know it rules out the warranty, but for the cost of shipping, I'm better off repairing them myself or buying others.)
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Old 05-08-2012, 11:11 PM
genious 7 genious 7 is offline
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Bump

...So does anyone know the cause?
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  #3  
Old 05-09-2012, 01:43 PM
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Please check all the connections on the back of the SUB. Pay close attention to the 13 PIN DIM connection. Make sure it is all the way in, and also check for any dust or obstructions.

Does it make the noise all the time?
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Old 05-10-2012, 11:09 AM
genious 7 genious 7 is offline
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Yes, it does make the crackling randomly, both connected and unconnected to an audio source.

The connector is all the way in, and (under a simple visual inspection) there is no visible dust or obstructions of any kind.

Answering other things you might will ask: no, there is no router/cellphone/wireless thing/power cables running besides the speaker cable. Yes, my electricity is ok, it goes to a power filter, and yes, I tried both with and without it.

Is the most common problem caused by a defective connector? Or what is the most common cause for the crackling issue. I don't mind if it is not user serviceable, I want to know what is wrong.
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Old 05-10-2012, 08:20 PM
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Sounds like the unit is defective. Please use the link on the left hand side of the page for a RMA request.
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  #6  
Old 05-11-2012, 07:59 PM
genious 7 genious 7 is offline
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I love how people read nowadays...

Quote:
Please don't tell me check connectors and RMA
Déjà vu...

So... can you answer my question now?
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  #7  
Old 05-11-2012, 08:13 PM
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I don't have any information on how one can fix the system themselves. Most issues arise from dust or the 13PIN connector not fully plugged in.
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  #8  
Old 05-17-2012, 05:45 AM
andyroo08 andyroo08 is offline
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I'm in the same situation with my SP2200 speakers and can't RMA due to shipping. After finding out the crackling with these speakers is a common problem I was going to throw them out and purchase something else. Instead I bought a cheap 17v power brick off ebay to see if that made a difference...........no more crackling!

2 mins later it was crackling again, I got mad and pushed my thumb through the left speaker, problem solved:)

Anyway, good luck!
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Old 05-19-2012, 11:30 AM
genious 7 genious 7 is offline
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I think I may have advanced somewhat. I don't know if I'm just getting lucky for the last few minutes, or having the speakers at max volume and lowering the volume via software solves the left speaker crackling issue. Can anyone confirm?

If so, it would mean the problem is in the potentiometer, not in the contact. It would mean it is fixable. Can anyone with the left speaker issue confirm? Just plug it in an ipod/pc; lower the volume via software, crank the volume to the top on the speaker, and hear if the issue persists. The speakers must be plugged to something, don't just disconnect if from the pc and then crank the volume.

@Ram Guy

I'm sure you must have some defective SP2200 somewhere. Could you test my theory please if you have time? I know this kind of troubleshooting isn't exactly what you are paid for, but as a favor.

Edit: Having the volume at max does seem to help. I could successfully play a complete "League of Legends" game without hearing a single crackle; and watched half of Lord of the Rings after it. To confirm, I reduced the volume halfway and the crackling reappeared. As I said, this would suggest the problem does not lie on the 13 Pin connector but elsewhere, in the volume potentiometer. I'll do some disassembly and update this thread with results just in case someone is curious. I would still like somebody else with the issue to confirm though. And yea, I know I'll be voiding my warranty, but for the cost of shipping, so be it.

Second Edit: Right now my speakers do not want to crackle, so if someone with crackly speakers have time, I would gladly appreciate if he/she could check if the crackling is present while using headphones connected on the Aux port.

Third Edit: Seems something I touched during disassembly magically fixed the problem. I can't get it to crackle anymore; tried moving every connector, piece, capacitors; but the issue does not want to arise anymore. Hmm, dunno, it fixed itself; although I know that those things that fix themselves will unfix someday. Anyways, I would still like to know out of curiosity the answers to the two questions above.

Last edited by genious 7; 05-20-2012 at 12:29 PM.
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  #10  
Old 05-21-2012, 08:44 AM
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@genious 7
I also have the same left speaker problem, maxing the volume sometimes fixes the problem, but there are times crackling persists also in max volume, using a headphone plugged in the speaker also reproduces the crackling in the left headphone, didn't tried plugging in aux, ill try it today at home.

Last edited by FHaze; 05-21-2012 at 08:51 AM.
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Old 05-21-2012, 05:28 PM
genious 7 genious 7 is offline
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That's great news (that the crackle is present in the headphone jack), which means that the problem is located in the right speaker circuit board, instead of on the sub woofer or left speaker.

I did a visual analysis of that circuit board yesterday and I can confirm that the issue must be there due to the fact that the headphone amplifier is fed from the audio input through there after several rc filters.

I still don't know which part is defective; it could be either the potentiometer or a capacitor; not many pieces there besides those. Since my speaker stopped crackling for the moment, I cannot perform more analysis until the crackling reappears.

I repeat my question: does anyone at corsair over there know what is the faulty / missing piece?

Evidence of Claims for the technically inclined

There are only three integrated circuits on the right speaker circuit board; two voltage regulators (5v and 12v) and the headphone amplifier (TPA122). The headphone amplifier has only three signals that would affect both the headphones and the speakers; the input signals or the supply voltage. Any of the other 5 pins would only affect the headphone, not the speakers. Ill check when I can the stability of the voltage at the regulators, if stable, it would mean either a capacitor, the potentiometer, or a resistor of the input stage is damaged/missing/wrong value.

Anyways, Ill share my discoveries as I make them; maybe I'll find a DIY fix it route.

Edit: I have confirmed that the issue is either in the potentiometer or in the input filters, as the output after the potentiometers goes straight to the headphone amplifier (through C24 & R25 for one side and C14 & R15 for the other channel). I'll try to find what is different between the left and right input filter; as some difference must cause the problem, as soon as I rule out the volume potentiometer. The headphone amplifier section is flawless, as I compared it with the application circuit on the datasheet and it is identical (with the addition of R24 and R41)

Second Edit: Memo to self and to other people with crackling speakers: check if crackling is duplicated in the subwoofer.

Last edited by genious 7; 05-22-2012 at 09:48 AM.
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  #12  
Old 05-22-2012, 07:31 AM
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@genious 7
Subwoofer also reproduces the noises.
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  #13  
Old 05-22-2012, 09:21 AM
genious 7 genious 7 is offline
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After further analysis, I think I have half the puzzle figured out. The crackling appears mostly at mid volume settings (check, it is almost nonexistent for low and high volumes.) This is due to the audio impedance being the highest at that level.

I still haven't figured what causes the crackling; there is a slim possibility of the contact after all, although I still think the issue must be on the volume control board; I can't imagine all the left speaker contacts of everybody failing while everything else stays the same.

Btw the sound is reproduced in the subwoofer because the split of the signal (between satellites and subwoofer) happens after the signal has passed through all the volume control (in fact, the crossover is located at the subwoofer, then the signal returns to the bass control pot at the speaker, and then it goes again to the subwoofer.).

The voltage sources are perfect, a stable 5v and 12v respectively. The impendance of the audio (which varies on the volume knob position) definitely has an effect on the amount of crackling; Ill investigate this some more by checking the subwoofer side of the circuit to get the full picture.

Last edited by genious 7; 05-22-2012 at 10:15 AM.
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  #14  
Old 05-22-2012, 01:43 PM
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I would suggest you submit an RMA using the link on the left and we can try and replace the satellite speakers as that would likely solve that issue.
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  #15  
Old 05-22-2012, 01:55 PM
genious 7 genious 7 is offline
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I said it once and I say it again: Shipping wont justify itself. Besides, I might have a clue on how to fix it. Given that impedance appears to influence the crackling, lowering it by using a preamp may solve the problem. I'll add a preamp in the circuit and see if that improves the issue.


By the way, @Fhaze, do you have the same shipping price issue as me or are you curious about the real problem causing this issue?
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