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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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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I have 2 12in kenwoods and a 1200 watt pyrimade amp, how can i hook these up to be the loudest


1st have your subs facing inwards towards the front of the car, not facing out the boot, This creates a better bass.

Wire 1 sub to one channel and the other sub to the other channel.

Turn down your gain as low as possible and then power everything up.

turn volume to desired loudness and then start turning up the gain slowly, if distorts a little turn in back down a notch.

avoid using bass boost, I agree it sounds great but it puts more strain on your amp and shortens its life.

after sorting out your gain, tweak all others until sound is bassy and clear with no distortion.

If you would like to use bass boost, turn on bass boost first, then up your gain etc.

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My subwoofer cuts out when their is only talking and there isnt any music or bassy stuff and stays off, once the music and anything that has bass starts up then it will come back on maybe its a setting...


You don't mention the sub model. Many have a setting for automatic response in the presence of a signal. You could try teh alternative to auto, maybe Always On.

Jul 22, 2011 | Audio Players & Recorders

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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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I installed a Pioneer DEH-P800PRS head unit and 4 Kenwood KFC-1662S speakers in my 2003 Dodge Dakota extended cab truck. I used a Kenwood KAC-5204 2 channel amp connected in parallel. Sounds good at lower...


Hello.... sorry to hear about your problem. Bass is the ultimate evil of coaxial speakers. You have a couple of options here, and this is just my professional opinion because I do not know what your lifestyle details, such as truck space needs, type of music you listen to, budget, etc. If you are looking for alot of bass, the best bet would be to use 2 external amplifiers, 1 for the interior speakers, and 1 for a subwoofer. You would then need to purchase an electronic crossover. With this setup, you can remove all of the low frequencies from the coaxial speakers and put them where they belong, with the sub. You will gain EXCEPTIONAL clarity and a very high volume before distortion level. Again it will depend on what your budget is and if you are willing to compromise on some cab space. The only other option you have at this point is if you are wanting to play your music at high volume levels, you will just need to reduce the bass level as you increase volume. I hope this has helped. Good luck with your venture!!

20 year car audio/video installer
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Mar 16, 2011 | Pioneer Car Audio & Video

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Optimum set up for Polk Audio PSW 10?


Run 2 RCA cables from the two Purple connections on your Receiver (Labled "PRE OUT SUBWOOFER") to the Red and White connectors on the back of your Sub (it does not matter which Purple connecter you plug into either the Red and White)

Set the volume control on the Sub to about 75%, and keep the power switch in the "ON AUTO" position. To set the Low Pass value, look at the back of one of the front speakers in your setup, and note its frequency range (will look something like 100Hz - 17kHz). Set the Low Pass at a value slightly higher than the low value on the back of your surround speakers.

To set the phase switch, stand in the middle of the room with some music on (something with some bass, but not over the top bass) and have someone switch between 0 Deg and 180 Deg. Listen for which setting sounds "Louder and Fuller". This is the one you want. You will need to do this each time you move the Sub, as its position may change its phase in relation to the rest of your system.

Good Luck!

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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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Speakers are crackling and distorted what size are front speakers for ford cougar 1999


crackling and distortion suggests poor electrical connections. Make sure that the connectors are a tight fit

Jun 08, 2009 | Car Audio & Video

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