Question about Infinity BU-120 Subwoofer

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Polk subwoofer making crackling noises

I have a polk subwoofer that will distort if the bass is too bassy. It used to run fine with nice tight bass then after a couple of years started to distort. It still sounds good for soundtracks but when it comes to certain very bassy parts of the soundtrack it will cut ut making crackling noises which irritates me. So what do I do? Can this be fixed ? I paid almost 400 4 years ago. Does this mean it's time for a new one or can this be fixed?

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Yea, now its time to replace it! the magnetic effect is weaken which makes the very bass low frequency sound to be distorted! You should re engergise the magnet of the subwoofer or should buy the new!

Posted on Dec 08, 2007

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Posted on Jan 02, 2017

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1 Answer

My Paradigm PDR 12 subwoofer has started to make crackling noises. Is this an amplifier malfunction?


Depends when it makes these crackling noises.

If it's when the sub isn't being driven, then it could be the amp. (Check for bulging capacitors on the amp board). If it's when you move cables about then it could be a broken lead or a dry solder joint on one of the inputs.

If the crackling is when the sub is running then it might be the voice coil has distorted due to being overdriven with a poor and highly distorted signal.

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How can I measure the sound quality from my receiver/amplifier and speakers? It sounds distorted to me and the components aren't cheap (Onkyo receiver and Polk tower speakers)


And if you measure distortion, then what? Do you have a scope and a spectrum analyzer and a calibrated sound source?

The Mk.1 Ear can decide if it likes what it hears. Some people LIKE excess bass, for example.

Determine if it's source-related, cable-related, channel-related, speaker-related by swapping or focusing on one at a time and comparing. Try naming the products and look at the manuals for correct setup.

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My sub woofer cracks & acts like the speaker is blown. Hooked it up to another source & the speaker is fine. What should I look at next?


So you're saying one source makes it crackle and another source doesn't. That suggest the sub is fine and we should examine the source and it's signal path. Please elaborate as much as you can on what it it/they are.

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My subwoofers make weird noise


crackle or distortion? either you have a problem in your low level imput wires coming from the head unit or your amp is sending a faulty signal...or if you are running dual subs and you have one wired oposite the other they will cancel eachother out, which is a common mistake.make sure that they are both pos. to pos. and neg. to neg.
or there blown or almost blown

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Center Speaker Audio Very Distorted


Love your screen name.

You didn't say what, if anything, preceded the appearance of the problem. There might be a clue.

Can you describe the distortion? Is it excessively bassy? If so, is it happening on all sources?

I'm assuming this is a modern digital receiver that is capable of many soundfield simulations as well as native Dolby Digital, DTS, multi-channel. If so we can use a stereo source and through simulation redirect some of it to the center speaker.

Using one of your receiver's many multi-channel simulation modes, put in a CD or tune an FM station and use it to diagnose the problem during later steps.

If it's only a single source and that source uses individual analog channel RCA cables, swap in another one or temporarily move the Center Channel feed to one of the other channels to see if it's before the receiver (in the source).or inside the receiver.

For multiple sources:

Is your Center speaker defined properly as Large or Small in the receiver's setup menu?The size refers mostly to the bass-handling capacities of all your speakers rather than their physical size. Speakers designated as 'Small' will not be sent much in the way of bass because they can't handle it well. The LFE/subwoofer channel(s) will get all the bass that was intended for them instead.

If you have a Small speaker improperly defined as Large it may be getting bass that it can't handle and that might sound like distortion. Having a Large speaker defiend as Small would result in less bass than expected but otherwise 'clean' sound.

Check the speaker setup in the menu for excessive volume level relative to the others. There is usually a calibration procedure the receiver will use to help you adjust the subjective voume of each speaker using white noise or tones.

Hope this helps.

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hello, check and see if cabinet has loose screws or if back panel is tight,bass can vibrate screw loose.good luck! also look for anything caught in the woofer causing the noise.

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Alesis RA500 amp - channels crackle, distort, cut out


you have a problem in output stage and output ic need to check or replace.

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Crackling Sound From Subwoofer


Check any wiring coming or going to the subwoofer. It sounds like it could be a loose connection.  Is there a LFE or bass boost knob on your subwoofer? Does turning that up/down cause the crackling (if it exists). If so, you could use some tuner cleaner to clean the contacts on the potentiometer knob.

If the crackling is on the subwoofer only, it might be damaged from bottoming out.  See if you can remove the baffle or grille covering the woofer and inspect for visual problems. You can also try to lighly push in and out on the subwoofer to hear if it makes any scraping sounds. If so, it is definitely damaged and the driver will have to be replaced.

Mike

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