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Klipsch ProMedia 2.1 THX Subwoofer hissing/humming/buzzing

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I ordered the new Klipsch ProMedia 2.1 Wired Computer Speakers directly from Klipsch earlier this year (so it is the newer model).

 

The subwoofer started to give off a slight hissing sound as soon as I plugged the power in (speakers not yet connected).  It is not loud enough for me to hear it if I am sitting at my desk with the subwoofer at my feet.  If I get on the floor, I can hear it from about 1 to 2 feet away.

 

Is this normal operation?

 

Some notes:

 

- I have put in a troubleshooting ticket, but want to make sure before I send this back.

 

- It does the same thing with or without a surge protector, and I have tried multiple outlets.

 

Thanks!

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I just bought mine from Costco last week and got the same problem. Low humming noise coming from subwoofer box. I can't tell whether it's from the sub or from the transformer/circuit inside the box. But it's definitely noticeable if you put your ear on the box or 1 to 2 ft. away from it. Also tried at different electrical outlet and isolated from other electrical/magnetic interference, with or without L/R speakers connected, with or without audio input source. All resulted in humming noise from the subwoofer box.

 

I am currently using a Logitech Z623 (2.1 system) but it doesn't have this problem. No humming at all.

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Welcome to the Forum, I don't own that product, but hopefully someone who does will pop in here with some advice.

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On 9/11/2020 at 7:47 PM, The Inspector said:

I just bought mine from Costco last week and got the same problem. Low humming noise coming from subwoofer box. I can't tell whether it's from the sub or from the transformer/circuit inside the box. But it's definitely noticeable if you put your ear on the box or 1 to 2 ft. away from it. Also tried at different electrical outlet and isolated from other electrical/magnetic interference, with or without L/R speakers connected, with or without audio input source. All resulted in humming noise from the subwoofer box.

 

I am currently using a Logitech Z623 (2.1 system) but it doesn't have this problem. No humming at all.

 

 

I just bought the ProMedia 2.1 from Costco too and I'm having the same humming issue. I'm getting a fairly noticeable humming sound from the subwoofer.  I have an older ProMedia ( 6+ years old) I am trying to replace because the right speaker is starting to have some rattle/cracking.  The older unit has no humming from the subwoofer board on the back ( I also noticed the newer version of the ProMedia subwoofer is way heavier, so I'm assuming they changed the woofer design). Just curious "The Inspector," how does the ProMedia sound compared to the Logitech THX Z623?

 

Is the Humming noise normal? I don't think it is... Can anyone at Klipsch confirm this is normal behavior?

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I am having the same issue. I hear a constant hissing as soon as the speakers are powered on.  I believe it may be coming from the 9-pin pre-amp input but it is constant. The only thing that stops it is turning it off. I also tried different outlets and even one from another room with an extension cord. I upgraded from a very old Boston Acoustics 2.1 computer speakers an never had this problem. Is there a resolution or a known fix?

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I too am having this issue. I bought a new unit today from costco and just started to notice the idle hum. I thought it may have been coming from the source, but even with the 3.5mm unplugged it still hums. It also appears to be unaffected by the volume knob and only goes away when the sub knob is turned all the way down, but doesn't get any worse when turned up. I have tried 2 different surge protector power strips and also directly into the wall with no apparent difference. 

 

So far I am loving these little things, but I hope this problem can be fixed. 

Edited by Cjkeenan

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I'm having the same problem. Purchased at Costco and August and worked fine the first few times i used them. In my case the humming starts as soon as I plug in the left speaker then it stops when I disconnect it.  

 

 

 

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A few months late but thought I would offer some input. I just recently disassembled my PC and noticed this issue after reassembly.

For troubleshooting purposes, I had nearly everything unplugged. Come to find out my system seemed to be missing some grounding.

As soon as I plugged in a properly grounded USB hub, the buzzing went away.

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Got the same set of speakers from Costco for Christmas (Odd how there is no power button). Was fine for a bit, but a pretty loud hum started up. The hum was unaffected by the volume knob. I unplugged the audio jack, and the buzz still persisted. Tried using different outlets, same issue. Could this be an amplifier issue? Lot of people are having this issue, so could it be a bad defect?

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Got the same speakers from Costco and have the exact same problem. I love these speakers, but the hum makes me crazy. Sounds like a 60hz hum, but might be lower.  Mine shouldn't have a grounding problem as it is plugged into a APC UPS which is well grounded. Tried different outlets and no joy. Anyone got a solution?

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Any fixes yet or news about the irritating  humming sound from the Promedia 2.1 speakers from Costco?  Purchased our set about 6 months ago...Humming started after a couple months of use.

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I just bought the Pro Media 2.1 from Costco as well. They were on sale and sounded pretty good in the store. It's disappointing how my little Logitech performs this. 

 

I'm debating if I should return it. 

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