This may be a somewhat lengthy question, and I apologize in advance, but I have been dealing with this problem for quite some time and would like to finally (safely) fix the problem. My current home theater consists of the following: Emotiva XPR-5, Emotiva XPR-2 and Emotiva XPA-5 amps, Marantz AV7702mkII preamp, LG OLED65E7P television, XBox 360, XBox One S, DirecTV 4K Genie Mini, Oppo UDP-203 4K UHD Player and Roku Ultra. The amps are on their own, dedicated 20-amp circuit and the rest of the equipment are plugged into an APC H15 Power Conditioner. For speakers, I have an SVS PB13-Ultra Subwoofer and Paradigm Prestige 95F for L and R, 55C Center, 25S x4 for sides and surrounds and CI Elite E80-A x4 for ceiling speakers for Dolby Atmos. All of the components are connected via Bluejeanscable Belden Series-FE Bonded Pair HDMI cables, all connections between the Marantz preamp and the amps are via BJC Belden 1800F Balanced Audio Cables with Neutrik XLR connectors and the speakers are all connected via BJC Belden Series 5000, 12 AWG cable with banana plugs.
My problem is that I have found 3 sources of ground loop hum and I am looking for the best and safest way to get rid of the hum. The first source is the Oppo Blu-ray player. Simply, when it is plugged in, I get the hum; when it is unplugged it is gone and when it is connected with a three-prong to two-prong adapter, the hum is gone. I was thinking that something like this (Ebtech Hum X Voltage Hum Filter) may get rid of the hum, however, I am open to other ideas.
The second source of ground loop hum is the coax cable for the DirecTV coming from the wall. When I look at the satellite dish, it looks like it has a proper ground wire from the splitter on the outside of the house, leading directly into the ground. Inside the house, the wire from the satellite dish is fed into a splitter and then distributed to the various rooms with DirecTV boxes. In my home theater, when the Genie Mini is plugged in and connected to the Marantz preamp (via HDMI), there is no hum. As soon as the coax is connected to the Genie, the hum appears. When the coax is disconnected, the hum disappears. I changed the coax cable from the wall to the Genie and the hum decreased by about 50%, however, it is still noticeable. I didn't know if this problem would be solved by doing some different kind of grounding of the wires/box or if something like this (Viewsonics VSIS-EU Cable TV Ground Loop Isolator) would be helpful.
The last (and worst) source of hum is my recently completed and connected computer. The computer is in a different room, plugged in to a Cyberpower CP1500PFCLCD UPS and connected to the Marantz via the same kind of BJC HDMI cable. The power supply in the computer is a Corsair AX1500i. There is an audible hum when the computer is connected, however, the hum increases to levels which make games unplayable when the graphics cards (two 1080 ti's in SLI) are being used past 50%-60% usage. At that point, the hum is louder than the game. I think this is a ground loop issue, because when I used the three-prong to two-prong adapter on the computer, the hum is completely eliminated (even at high GPU usage). Also, when I am playing games with desktop speakers plugged into the same outlet as the computer, there is no hum. I was wondering if the same hum filter (Ebtech Hum X Voltage Hum Filter) would help with eliminating this hum also. I read it has a 6-amp max. I'm not sure how much power my computer pulls. I also read that an online, double conversion UPS may eliminate the ground loop. Do you think either of these would safely work or do you think there are any alternatives.
Finally, I have read some about ground lifting and wondered if something like this (Hosa GLT-255 XLR Female to XLR Male Ground Lift Hum Stopper) connected to each of the 11 amplifier inputs and 1 to the subwoofer would help (and be safe) without loosing quality of sound. Thanks in advance for any help anyone could provide!
My problem is that I have found 3 sources of ground loop hum and I am looking for the best and safest way to get rid of the hum. The first source is the Oppo Blu-ray player. Simply, when it is plugged in, I get the hum; when it is unplugged it is gone and when it is connected with a three-prong to two-prong adapter, the hum is gone. I was thinking that something like this (Ebtech Hum X Voltage Hum Filter) may get rid of the hum, however, I am open to other ideas.
The second source of ground loop hum is the coax cable for the DirecTV coming from the wall. When I look at the satellite dish, it looks like it has a proper ground wire from the splitter on the outside of the house, leading directly into the ground. Inside the house, the wire from the satellite dish is fed into a splitter and then distributed to the various rooms with DirecTV boxes. In my home theater, when the Genie Mini is plugged in and connected to the Marantz preamp (via HDMI), there is no hum. As soon as the coax is connected to the Genie, the hum appears. When the coax is disconnected, the hum disappears. I changed the coax cable from the wall to the Genie and the hum decreased by about 50%, however, it is still noticeable. I didn't know if this problem would be solved by doing some different kind of grounding of the wires/box or if something like this (Viewsonics VSIS-EU Cable TV Ground Loop Isolator) would be helpful.
The last (and worst) source of hum is my recently completed and connected computer. The computer is in a different room, plugged in to a Cyberpower CP1500PFCLCD UPS and connected to the Marantz via the same kind of BJC HDMI cable. The power supply in the computer is a Corsair AX1500i. There is an audible hum when the computer is connected, however, the hum increases to levels which make games unplayable when the graphics cards (two 1080 ti's in SLI) are being used past 50%-60% usage. At that point, the hum is louder than the game. I think this is a ground loop issue, because when I used the three-prong to two-prong adapter on the computer, the hum is completely eliminated (even at high GPU usage). Also, when I am playing games with desktop speakers plugged into the same outlet as the computer, there is no hum. I was wondering if the same hum filter (Ebtech Hum X Voltage Hum Filter) would help with eliminating this hum also. I read it has a 6-amp max. I'm not sure how much power my computer pulls. I also read that an online, double conversion UPS may eliminate the ground loop. Do you think either of these would safely work or do you think there are any alternatives.
Finally, I have read some about ground lifting and wondered if something like this (Hosa GLT-255 XLR Female to XLR Male Ground Lift Hum Stopper) connected to each of the 11 amplifier inputs and 1 to the subwoofer would help (and be safe) without loosing quality of sound. Thanks in advance for any help anyone could provide!
/www.electriciantalk.com/f2/ground-rod-resistance-16224/
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