What can you do about a loud hum when resistance is increased?
334740
Tell your fat husband to knock it off. A grinding humming is not needed for a good workout.
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.
766189
The reason you are hearing the hum is because your transformer plates are slightly loose. The metal plates in the core are laminated and can become separated, you may be able to reduce or eliminate the hum by painting a varnish or shelac onto the core and letting it "soak in". I would suggest several thin coats to do the job. The metal core itself can be loose and vibrate as a whole too so you may need to seal that up the plastic bobbin that the copper windings are wound on. Otherwise if all else fails this unit is quiet, at least the one I got is. You may also try insulating between the transformer and the joist if yours is mountable that way. Hope that helps. The reason you are hearing the hum is because your transformer plates are slightly loose. The metal plates in the core are laminated and can become separated, you may be able to reduce or eliminate the hum by painting a varnish or shelac onto the core and letting it "soak in". I would suggest several thin coats to do the job. The metal core itself can be loose and vibrate as a whole too so you may need to seal that up the plastic bobbin that the copper windings are wound on. Otherwise if all else fails this unit is quiet, at least the one I got is. You may also try insulating... » Read More The reason you are hearing the hum is because your transformer plates are slightly loose. The metal plates in the core are laminated and can become separated, you may be able to reduce or eliminate the hum by painting a varnish or shelac onto the core and letting it "soak in". I would suggest several thin coats to do the job. The metal core itself can be loose and vibrate as a whole too so you may need to seal that up the plastic bobbin that the copper windings are wound on. Otherwise if all else fails this unit is quiet, at least the one I got is. You may also try insulating between the transformer and the joist if yours is mountable that way. Hope that helps. « Show Less
526474
Ground Lift changes the polarity so if you are experiencing "humming", switch the lift and this should remove any un wanted noise. Coaxial inputs are to plug in an external recording devise. Hope that helps you!
1077086
I don't think I've heard any on mine. If you are hearing the hum while using the RCA jacks then maybe trying unplugging it from USB/have the turntable and speakers on separate outlets. If you are hearing it over USB then maybe just try the same isolation but between the computer and the turntable.
65019
At high power levels there is a hum. At lower levels there is little or no noise.
2205085
it solved my humming problem when i used 2 or more components plugged into my receiver. but when i got a more powerful amp i didnt need it. i would try it...you can always return it.
526475
Hi Kenny. Ground lift can sometimes be used to reduce or eliminate 60Hz hum, caused by ground loops. Ground loop can occur when you have multiple pieces of equipment connected to different power sources. Most of the time you'll want this off (not lifted) unless you are experiencing hum. Coax is for connecting similarly equipped digital equipment (only). It's best used to sync multiple audio interfaces. If you don't know what you need it for, you probably don't. Hope this helps! :) ~ Heather
823634
I noticed it too. When the device is connected via the instrument connection the floating ground will cancel any noise. One must remember, this isn't a professional piece of equipment with layers and layers of MOSFETS, JFETS AND TRANSISTORS To switch on and of the signal. So, even though there is no signal, it's amplifying the hum from the AC transformer as well. In common terms, it needs to be connected to a device to cancel the noise. Even in the ground, or lift phase.
1931825
we are not using it to power audio equipment so i do not know if it will produce a hum in your equipment the unit itself is quiet I know some supplies do hum but the one we have is quiet
333126
Well, let me qualify my response, not unless the 'appliance' you have plugged in to happens to produce a humming sound. For whatever reason that is. LMAO!
1705081
i've never noticed a hum. The red LED is a bit distracting, but I just turn it away from my line of sight. Seems to work just fine overall.Note: I am not an audiophile and don't hear frequencies much above 10 kHz. Sometimes other people hear things that I don't. FYI.
819556
Also, Jeff: Even after all the electrical questions are answered, this still makes a low level hum which might be annoying. Having tightened all the external screws on mine, the hum was far less but could still be heard during the silence between musical tracks or even with very quiet passages.
554234
I just bought it & have Windows 7. It works fine except it has a hum that I can't get rid of. I've played with the gain button & the mic volume, but it's still there. Any suggestions?
1510638
Hi i own two on them on same ciruit no humming sound while in use. Good luck.
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 !!
88307
Subwoofer Hum Solutions The following are a few steps to take which have proven very successful in fixing the problem (listed in order preferred method): * Make certain that both the receiver and subwoofer are plugged into outlets that share a common circuit breaker. * Decrease the level setting at the sub and increase the sub level in the menu system of your receiver. * Temporarily disconnect the coaxial cable (Cable TV, Satellite connection), that is coming in from the outside in many cases there is a weak ground present which can cause noise. If the noise is gone while the cable is disconnected, you can purchase a coaxial grounding block from a local electronics store and follow the directions in the package. For reference: http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=180-075 http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=090-338 * Temporarily run a small wire between the chassis metal of your source unit to the chassis metal on the rear panel of the subwoofer, if this alleviates the noise you can use a chassis screw from each unit to attach the wire to, many receivers have a provision for this labeled as GND near a thumbscrew. * If all else fails you can use a 2 to 3 prong adaptor to lift the ground connection on the power cord. This is not a recommended solution in electrical storm prone areas, but it does work to eliminate the noise in most hard to correct situations.