What can I do about the AC hum from the unit? Would grounding the unit help?
1803459
Consider the size affords moving to an area where spurious electrical signals would be minimal. Use an outdoor extension cord to move as far from any building as possible. If the noise continues then the problem is from the internal electronics. If the hum is gone then the problem is coming from the area where you normally use the Bose. You need to find what the problem source is by turning off all the electrical apparatus near to the unit.
1803460
Possibly...I haven't experienced any noise from my Bose that isn't supposed to be there.
1803461
Try Buying a quality surge Protector. If that does not work then it could be your actual electrical system. The Electrical System in my new to me house is rock solid stable and I do not have any problem that you site. If a new Surge Protector does not fix your problem then Do Contact Bose Tech Support and maybe they can assist you.
1003628
No, It's not normal. It's probably 60 (Hz) hum. Try reversing you AC plug, that should fix the problem 90% of the time. If that doesn't work try grounding the case.
1189757
Radio shack also sells ground loop.isolators or you can build your own from a 1:1 transformer this should also fix the hum as well.
1543742
It is a low pitch hum. Usually mine is on low and I get used to it and don't really notice it. Higher speed is more noticeable, but still more a medium pitch, not high-pitched.
2148362
We had one with a loud humming noise and it turned-out it was not working properly so we returned it for a new one. They can have a low pitched hum but it should barely be noticeable. If you know how to check the voltage with a 12 Volt meter, you can check the delivery side of the transformer.....if it is not giving a consistent voltage of around 12, the transformer is bad.
558411
Whenever you get that dreaded hum, be sure to check your ground connections.Could be something as simple as trying out a new instrument cable.I've even had some brand new cables with an open ground.You may have to re-solder the ends.
1695892
You know I had to go and check! However, I have an 828LM and no hum whatsoever. Have you unplugged (the replugged) the unit and tested it away from other equipment for this humming noise?
873698
It sounds like you must have a defective unit. I don't get a hum with either tubes or solid state amp. Sorry yours is making bad noises.
1194658
I purchased this for a classroom that had a 3.5mm audio wall plate to speaker that was humming. It did not resolve that issue. For home components I would get a quality a/c line filter, or even try replacing the a/c outlet with a higher quality one. See PS Audio.
769810
Try unplugging the AC power plug, spin the plug 180 degrees, and plug it back in. Occasionally a buzz can be created when the power is "out of phase" with something else plugged into the AC circuit.
447995
Have you noticed if yours hum? I'm wondering if sinking the box into the wall- as you did, will help decrease the buzzing sound they emit. Thanks for any insight.
2144805
Sounds like it's too much squelch. Turn it up until you have a constant static, then back it off until there's nothing. That's what we did and we don't have that problem.
996968
That's kind of what I had. But it wasn't a steady buzz - more like a loud 60 Hz humm. I even tried to move it as far from the TV as I could. I was thinking there was some sort of interference, and separation might help. But no. Amazon is great about returns. This is first time I had a problem with a purchase.
1316026
yes but when i went to play music on it i had a very bad hum in the music , I tried 2 time's with 2 new unit's the same noise every time sow i got a different unit and now noise at all ! Hope it work's 4 u !!
1489779
I have sold several of these without any issues. Check your ground at the panel. I think neutral and ground need to be bonded in your panel if it is hard wired to panel. If you mounted an outlet to the inverter, try connecting the ground and neutral together and the use a ground rod to earth. I cant think of anything else that would cause it. Sometimes fans will hum slightly, that is from the square sine wave but I havent heard of buzzing in stereo yet.
2208069
Yes. cannot introduce ac, hiss, hum etc because it is a non- powered passive unit.
1427669
Double check in the owners manual for hints. Or call the company for their take on this. If nothing else I concur with others, replace the unit.