4 Channel Ground Loop Isolator
    Product # 6909
    4 Channel Ground Loop Isolator
    Product # 6909
    $7.85
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    In Stock This item should ship today (1/17/2017) if ordered within 4 hours 44 minutes

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    4 Channel Ground Loop Isolator

    Isolate and eliminate noise caused by a ground loop in an audio circuit with this Four-Channel Ground Loop Isolator.

    The isolator ensures that the shield ground on each audio cable is isolated from any equipment ground, which could cause audible noise when amplified. This device has four channels, composed of two pairs of stereo (L+R) inputs and outputs.

    The nominal DC impedance of the device is 100 ohms and the audio impedance is 3500 ohms at 1000 Hz. The nominal input power is 50 watts, with a maximum power level of 100 watts.

    Each of the RCA plugs and jacks is gold-plated to ensure smooth, corrosion-free connections. The unit measures 3.9" x 2.0" x 0.9" (100 x 50 x 22 mm) and both the input and output leads measure 9" in length.

    Note: The packaging erroneously indicates that the isolator's case is made of metal. It is in fact made of plastic. We are working to correct this discrepancy and apologize for any confusion or inconvenience it may cause.

    4.1 / 5.0
    39 Reviews
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Star
    26
    4
    3
    0
    6
    Solved my interference problem
    I bought this hoping it would solve an audio interference problem that occurred whenever I attached my notebook's audio output to my stereo. It wasn't a 60Hz hum more like a digital "hash" noise (clicks, pops, and buzzes) that increased whenever the PC did something like read its hard drive, or transmit data over the WLAN.

    This product completely eliminated the noise. Since the problem was so frustrating to solve (I had tried grounding the PC, changing cables, etc.) I was amazed with this result.

    Next, I plan to use the additional pair to connect the tape out from the stereo to the PC's audio input. Haven't tested that yet, but based on the above I'm optimistic.

    PROS: Well constructedhas those finished "wet look" plastic cables (not sure how to better describe them, but I've purchased other cables and adapters and have always been happy with whatever type of plastic this is). 4 channels (two stereo pairs). Works well, looks good.

    CONS: It would be nice if the cables for each pair were labeled (though you can easily look at the circuit trace on the bottom of the board to make sure you aren't mixing up the pairs).
    April 29, 2011
    Does the job I guess
    Four channels in one unit good cost to worth ratio
    It does actually eliminate hum (possibly partly due to the severe attenuation?)

    It would be nice if the connectors were numbered (down-rate). You can kind of figure it out by how the wires enter the box but when behind a crowded A/V center anything that helps visibility.
    I had to crank my sub level up big time to compensate for the attenuation this thing causes (down-rate).

    I still wonder if a simple 8 ohm isolation transformer from Mouser would have done the same thing.
    July 11, 2011
    Worked perfect... for 24 hours.
    If I had written this review yesterday morning after installing the product, it would have been an unreserved 10! I was so thrilled to get rid of the alternator whine in my Ford Expedition. I bought this isolator several months ago, but had been procrastinating on the installation because I didn't want to pull my in-dash stereo to get to the wiring. Then I found out that I could also install it in the back of the vehicle next to the amplifier, which was much easier. Everything worked great and I was completely satisfied.

    Went out this morning to run some errands with my wife, sounded great for about 45 minutes, then all of a sudden the whine came back all at once. I have no idea what happened or what caused it to stop working. Very disappointed.

    PROS: 4-channel
    Perfect length cables

    CONS: Lack of labeling to separate each plug
    Only worked for 1 day
    September 11, 2012
    Groundloop Not for A/C
    Apparently this is used for car audio, and searching for reviews I found that it could work on A/C too, but in my case it doesn't solve my problem. The buzzing increases and a radio station suddenly sound through my speakers, LOL!!!! Maybe next time I install a car audio system I'll used it.

    PROS: Neat and a great price for a 4 channel isolator.

    CONS: Doesn't work on my Dj Equipment.
    January 17, 2013
    5/5
    Item does what it is supposed to do. The shipping time to get this was too long in my opinion. If I want something quickly I'll use ebay or amazon.
    December 29, 2014
    Removed Hum
    I have two devices connected to my hdtv that were causing hum. The audio connection from my pc generated a very noticable hum. Ditto for the audio out connection from the tv to my Vizio sound bar. Connected both thru the ground loop isolator (since it has two stereo channels), and voila, hum gone. Great product.

    PROS: Removed hum.

    CONS: None
    April 11, 2012
    Happy and Happier
    Monoprice delivers: A great product, at a great price, and delivery can not be faster.

    I am impressed.

    PROS: Happy: Eliminated the humming from my PC to stereo connection.

    Happier: I ordered at 9:45 AM. It arrived the next day by 11:30 AM.





    CONS: None really. If I could think of anything to make this experience even better, I would like MONOPRICE to show all the products that can work together when you place your order. In this case a 3.5 mm Male to RCA cable that I didn't realize would make the perfect complement to the ground isolator.
    December 28, 2012
    Crystal Clear
    I purchased the Radio Shack Ground Loop Isolator and had some disappointing results (sorry RS). I would still get some pops and buzz when turning on my amp which is connected to my HTPC. Found these at my favorite place to shop for electronics, MONOPRICE, and once again my expectations were exceeded in price, performance, and delivery. MONOPRICE ROCKS!

    PROS: Silent is golden! No perceived signal degradation. Affordable. Good build quality. 4 channels instead of two. Heck, I even like the color and the see through enclosure which reveals the circuit board...appeals to the geek in me. :)

    CONS: Like others have written, you have to track the inputs to the correct outputs but unless you are a complete incompetent it's not really an issue.
    November 12, 2011
    5/5
    So far, great product for the price. I am using it to connect my Mac to my stereo system. It had a hum before using the product and now its gone. I only used one of the pair of cables.

    PROS: Got rid of the hum noise

    CONS: None as of yet. have only used it a week so far.
    January 4, 2011
    Another quality product from Monoprice
    I use 2 MacBook Pros sharing one keyboard and mouse and sharing one audio sound system via an audio mixer. When all of the cables are plugged in there was a loud hum, which, as it turns out was associated with ground loop. This device solved the problem completely, as advertised.

    PROS: This device solved a major loud hum problem associated with ground loop with my audio/music system, as advertised.

    Handles 4 channels ie: 2 each stereo (left and right sources), all the other ground loop isolator a that I found would have required 2 ground loop isolators as they only support 2 channels.

    CONS: Absolutely none
    November 19, 2014
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