remove hum from active subwoofer?

[BlaezaLite]

good advice. I just printed money and have to wait for the ink to dry. I like how people throw out advice like its no big deal for them. "yea, JUST get"....


ill try that. thanks


who says this is true?

Its advice, like you asked for?

Or Speedwoofer? Wharfedale? Monoprice? Quality at a budget. Better?

 

[AsRock]

when nothing is playing theres a hum. I usually ignore or dont notice it. but its something id like to lower it a bit. possible?

disconnected from avr, still hum, put it on same electrical line as the other components, hum.

Sounds like a bad ground, even when the cable is disconnected from the sub side ?.

 

[ty_ger]

It's a hard wired setup not one of those figure 8 plugs or did you not look at the picture the OP posted

I think he is talking about the plug you put in the wall; assuming that it is an ungrounded plug that can be flipped.... Swapping which side is hot and neutral. But, if the plug is symmetrical that the hot and neutral sides are the same size, one would assume that the manufacturer assured that it should work properly either way.






I think Vayra86 has this handled.

 

[Wirko]

I think he is talking about the plug you put in the wall; assuming that it is an ungrounded plug that can be flipped.... Swapping which side is hot and neutral.

Yes, that's it.

But, if the plug is symmetrical that the hot and neutral sides are the same size, one would assume that the manufacturer assured that it should work properly either way.

It's basically impossible to isolate the 50/60 Hz interference from audio signals once and for all. Yes, the amount of hum is often "low enough", and it's lower with balanced wiring, but sometimes it's unacceptable. Turning the wall plug 180° is a simple experiment and sometimes affects the hum (for better or for worse).

 

[Steve-007UK]

Could just be a bad cable. Try swapping. If not then it is something internal that you won't be able to fix easily.

This is a thing, i've had a few subs over the years some good some bad but depending on what cable i have used can make the sub hum when nothing is playing where as a cable that is well shielded works fine and i get no humming sounds so try to test some different cables first.

This is the cable i use atm but running it from my yamaha stereo amp as it has sub out.

Amazon.co.uk

If it still makes humming sounds when that cable is not plugged in then the sub is getting old and something inside is failing

 

[eidairaman1]

Sounds like a bad ground, even when the cable is disconnected from the sub side ?.

Possible transformer resonance being passed into the audio circuit

 

[AsRock]

Possible transformer resonance being passed into the audio circuit

Or even a dry joint who knows.

 

[unwind-protect]

If the thing hums when no input cable is connected you are basically screwed.

Wegschmeissen neu kaufen.

 

[Wirko]

Or even a dry joint who knows.

Or a dry capacitor. If monitors and mobos can have them, so can subwoofers.

 

[Courier 6]

or maybe the filter capacitor from the amps psu is going bad, only solution is to replace the capacitor

 

[damric]

It could be anything posted above. I/O jacks do wear out, some way faster than others. I've had a few cheap guitars that would hum once the jack socket started to disintegrate from plugging and unplugging. At least if it is the jack socket, you might be able to find replacement parts and repair it yourself. I'm an electronics technician and it wouldn't even be worth my time, so I'd buy a new sub. Time and frustration can be worth more than money.