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  • Viewsonics VSIS-EU Cable TV Ground Loop Isolator
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Viewsonics VSIS-EU Cable TV Ground Loop Isolator

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List Price: $29.99
Price: $24.97 & FREE Shipping on orders over $35. Details
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Only 2 left in stock.
  • Helps eliminate audio hum and horizontal scrolling bars caused by ground loops.
  • Low insertion loss - transparent to all cable TV signals and services, from 100Hz up to 860MHz.
  • Eliminates loops by isolating the ground connection between components so that currents cannot pass.
  • Should be used to supplement a well grounded system A/V Home Theater, when grounding issues persist.
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Frequently Bought Together

Viewsonics VSIS-EU Cable TV Ground Loop Isolator + Petra F820 F Male to F Male Coupler + Monoprice 105359 75 Ohm Quad Shielded CL2 F-Type Coaxial RF Cable
Price for all three: $34.91

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Technical Details

  • Brand Name: Viewsonics

Product Description

When two or more devices are connected to a common ground through different paths, ground path noise or a ground loop can occur. This is actually quite common in home theater systems, even those that are well designed. The result of a ground loop is audio hum and/or horizontal bars in the TV picture. Disconnecting coaxial connections between components eliminates the hum or interference. If "beefing up" conventional ground connections and establishing solid ground points in your cable system does not resolve these problems, then a CableTVamps Ground Isolator is the most reliable way to fix it.

Product Details

  • Shipping Weight: 2.4 ounces (View shipping rates and policies)
  • ASIN: B0017I3K9M
  • Average Customer Review: 4.8 out of 5 stars  See all reviews (253 customer reviews)
  • Amazon Best Sellers Rank:
  • Product Warranty: For warranty information about this product, please click here
  • Date first available at Amazon.com: April 5, 2008

Important Information

Seller Warranty Description
Seller's limited is repair and/or replacement of the product within 30 days of the purchase. All returns requested REQUIRE seller's approval and an RMA. ALL RETURNS REQUESTED DUE TO NO FAULT OF THE SELLER MAY BE SUBJECT TO A 15% RESTOCKING FEE.

Customer Questions & Answers

Customer Reviews

4.8 out of 5 stars

Most Helpful Customer Reviews

55 of 56 people found the following review helpful By D. Hancharenko on July 8, 2010
Verified Purchase
This story, like many others on this board, have striking similarities to each other.

1. I buy an expensive new media center toy...

2. I experience buzzing from my speakers with the new device installed...

3. Call the cable company after tracing the buzzing sound to a poorly grounded CATV line (house is properly grounded too)...

4. Cable guy comes out and finds no problem even though he can hear the buzz as I plug in and unplug the coax...

5. Cable guy says TV has to be up pretty loud to hear buzzing, blames problem on TV...

6. I go into GTFO of my house mode... (important step)

7. Buy Viewsonics VSIS-EU CATV Ground Loop Isolator...

8. Plug in isolator...problem solved...no more buzz....

9. Post wonderful review for this product, immediately...
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15 of 15 people found the following review helpful By C. Benedetti on March 25, 2009
Verified Purchase
I have had horizontal lines going up my screen for years. Bands of color that are worse on some channels than others, and different dpending on what plug my cable box was plugged in. I have a pretty good "Pure AV" power cleaner and protector, but that didn't help at all. I thought it might be a ground loop feedback problem, but wasn't sure what would solve the problem. This did the trick! I just plugged it in, and no lines! Nice to see pure black images without the interference. Finally. Again, I wish I would have gotten one of these years ago. FYI, I'm using this with HD channels and no problem. I was a little concerned the cheaper ones might cause a problem with the bandwith and HD. This one works perfectly and no problems.
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15 of 16 people found the following review helpful By James Goddard on December 31, 2009
Verified Purchase
I have Comcast as my cable provider, and their signal generates a ground loop when hooked up to my home theater system. Of course Comcast will not fix the problem for free (no customer service), and thus I needed to find a way to fix the AC hum and the vertical video bars that were being caused by marriage of Comcast and my home theater.

Enter the CURE. The Viewsonic Ground Loop Isolator was the miracle device that stopped the AC hum, and the vertical roll on my 55 inch Plasma.

Here is a hint when hooking up the device. First forget extra adapters. Just get a small section of RU6 with a F connector on each end. This will keep stress off the connection at the cable box. Then make sure the "system" side of the isolator is connected to the cable coming from the wall, and the "subscriber" side of the isolator connected to your short piece of RU6 that is then connected to your cable box. DO NOT USE THIS DEVICE WITH SATELLITE SYSTEMS.

I gave this device 5 stars because it works exactly as advertised!
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11 of 11 people found the following review helpful By L. Rodriguez on December 5, 2010
I am not going to repeat yet another story about ground loop problems solved by this device but I wanted to add a bit of info that nobody has addressed in the previous 39 reviews. My particular situation affected both a home theater system and a computer due to using both cable TV and cable Internet and that the computer is also part of the home theater system. I placed the isolator right at the cable TV service drop before the splitter that splits the signal to the converter box and to the cable modem. Placing it just in the cable converter splitter leg would not solve the problem. Absolutely no problems with Internet connection speeds. The isolator is totally transparent to cable reception and Internet service.
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7 of 7 people found the following review helpful By Laura Frank on May 9, 2009
Verified Purchase
We've had scrolling lines in our cable signal for a while. We connect our cable over Component to our Sony HD TV as the two HDMI inputs were taken by the DVD and a computer. We knew we could solve the problem by either getting an HDMI switcher ($65 to $120) because the problem was only on analog connections. And we knew we could also get a professional 'Humbucker' ($400) for the Component lines, as we had solved the buzz in the audio system with a similar, and cheeper piece of gear. I had no idea this problem could be solved on the input side of the cable box. This device did the trick and for the right price!
As a side note, I did try and call Comcast to ask about putting a ground loop isolator in line before the cable box. That was useless. Nor had they any idea what video hum looked like.
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10 of 11 people found the following review helpful By J. Lampara on July 14, 2009
Had a hum on my cable box that really annoyed me, after getting no help from my cable company, I picked this up. The hum is completely gone and I have no distortion in my picture.
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6 of 6 people found the following review helpful By Bebahru on March 18, 2010
Verified Purchase
When "Cable"; "DSL" telephone modems and some outdoor antennas are connected to your PC or audio system a ground loop can develop. This happens when your AC power system's earth ground and your "Cable" "DSL" or "Antenna" have an earth ground at a physical point removed from where your AC power provider grounded your breaker box. If you notice a "hum" or "buzz" in your audio (computer, home theater, etc.) a ground loop may be the problem. The Viewsonics VSIS-EU does a good job in isolating 75 ohm systems such as cable modems from your audio equipment. Therefore, with the VSIS-EU the ground loop no longer causes the "buzz" or "hum" in your audio system. One can experiment by disconnecting the round coaxial "F connector" from the cable modem, television or FM receiver. If the hum disappears likely you have a ground loop causing the "buzz" or "hum" - Viewsonics VSIS-EU is your cure!
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