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Hi, you may have a bad Earth power 110 V AC cable connection which makes such hum / buzz even nothing connected..
Check the connections between
components and make sure they are secure before proceeding to the next
Step. Sometimes, loose connections can cause a hum.
Separate the audio cables from
the power cables; electromagnetic interference from the power cables can
cause stereo hum. Use cable ties to secure the audio cables away from
the power cables.
Plug in a surge protector to the outlet, and then plug all the components into that surge protector
Connect a ground plug to the
surge protector and then plug the ground plug into the main outlet. A
ground plug is available at any hardware store, and turns a three prong
connection into a two prong. Ground plugs help eliminate 60 cycle hum.
Connect the ground wire from
your turntable to the ground wire connection on the receiver. If this
doesn't work, looking on the back there should be a grounding point,
receiver.. Split a wire and attach one of the splits to the receiver
where you will see the text, "ground" or something similar. Attach the
other end to something metal such as a pipe that goes into the ground.
Secure with electrical tape. Plug in.
connect the ground wire to a screw on the electrical
I'm thinking you have an open shield ground on the RCA input side. Connecting speaker inputs possibly restores the ground. Try connecting the high level inputs then disconnect the remote end of the cables (floating the grounds).
Then get out an ohmmeter and find that open circuitor or bad solder joint between RCA ground and real ground in the speaker's amplifier. Or.... if speaker ground kills the hum and you want to use RCA Line Level input to the sub, just connect one minus speaker output on your source amp to one minus on the sub's amp.
A well know problem to the Behringer Truth B2031A speakers is radio interference and noise. I had the same problem with mine and found a solution on a forum!
If you open the speakers, you'll see a cable from the main board that runs to the 2 lights at the front (on/limit LED's). It functions as an antenna... Disconnect it and your speakers are silent, finally. (OK no leds, but I can live with that).
I'm not sure what you are asking. The ground loop is specifically intended to reduce or eliminate buzz/hum from the turntable. If the ground loop is in place and connected as per the instructions with your turntable/receiver, these noises should not be an issue in a modern system. I would make sure that your connection is solid and at a good ground point (easy to check if you have an ohm-meter/multi-meter (which comes in handy for many things and can be had very inexpensively). If the wire is broken, it can be replaced with any wire of the same or heavier gauge.
If I've failed to understand your problem, please post more detail and I will try again. If not, please let me know if this is helpful. Good luck with your problem.
If what you mean is a low humming sound when the volume is turned down to minimum level, this is usually from power supply filtering problems. Most of the time this is from the electrolytic filter capacitors going out of spec with age and use, and or voltage retulation problems.
If the sound is quiet with the volume turned down, and the hum or buzz increases with the increase of the volume control, this is usualy due to a ground loop problem between the associated equipment connected to the amplifier, or a bad interconnect cable.
It works fine for a couple of minutes the starts to hum. If you turn up the volume it masks the noise but is till audible, also the video switching cuts out. after examining the components I have seen some heat discoloration in the power suply area and believe it to be power for the video board. disconecting the ribbon cable form the video board the hum goes away, and so does any video wich does'nt matter for me because my monitor does all the HD video switching. hope this may help with some noise problems.