The EZ-HK1 is perfect for portable use or for permanent installations where ever audio ground-loop hum elimination is needed. The shield connection of each INPUT jack is electrically isolated from the case and from the output ground. The EZ-HK1 offers unbalanced stereo galvanic isolation and a Switch-Selectable ground lift for the OUTPUT jacks. Offering both 3.5mm Mini-Jacks and gold-plated RCA jacks the EZ-HK1 can be installed into any modern audio system that uses consumer level audio equipment. The EZ-HK1 eliminates hum due to ground loops when it is installed between an unbalanced audio source, such as a computer, CD player, cassette player or other consumer audio product, and the input of a grounded amplifier in an audio system. If you connect the output with DC offset directly to the coils of the transformer a DC current will flow in the coil that may or may not affect the way the source behaves.Įveryone with a notebook should have one of these in their bag (along with an EDID emulator), so the next time you do a presentation, you will have the purest sound along with sharp and trouble free video image.Ground loop hum is often encountered whenever two pieces of unbalanced audio equipment are connected together but are being powered from outlets on different circuits. The difference in ground potential between two pieces of unbalanced audio equipment can be a major cause of noise in audio systems today. Most audio sources should have these AC coupling caps on their outputs anyway (so their average output voltage is not biased at some DC voltage), but once in a while you have a source that has a DC output offset. The input side (the female 3.5mm at end of cable) has DC blocking capacitors, so it is a good idea to make sure to not reverse the input and output. So if your load is 5K Ohm, adding the isolator in front of it, the source still sees a 5K Ohm load impedance. It uses 1:1 audio transformers therefore it does not change the impedance. In order to isolate this Bias level from the transformer coils, DC blocking capacitors are employed in the GLI-35mm. Level to Low Converter Line Output with Ground Loop Isolator. Some audio source equipment may have a DC bias voltage on their audio signal. Ground Loop Noise Isolator 50W 4 Eliminator Remover Ground Loop Isolator for Auto Vehicle Car. The input side incorporates DC blocking capacitors. In most cases the unit can be used in either direction, however it is designed so that the Female 3.5mm mini-stereo connector is to be used as input and the male connector is the output. The GLI-3.5mm is simply inserted in series with the audio and it literally eliminates the ground connection between the two sides, passes all the audio while filtering out any noise using high performance audio transformers. Line-level audio is a very tiny low-level signal, so any noise in AC ground, even as little as 0.004v, will be quite audible - yuck! This is because, by doing so you inadvertently eliminated the ground loop. In fact you may have noticed that if you disconnect your notebook power supply and ran on batteries the noise has gone away.

On the other hand unbalanced signals, such as the one coming out of your notebook, have no reference other than building/AC ground. Any noise in the ground between the source of the Audio signal and the amplifier is automatically ignored. Professional equipment have balanced audio which uses a + and a - signal for each L/R side and therefore does not rely on ground. Have you ever connected a PC or notebook to an audio amp or a TV and gotten all kinds of ugly noise? Most people would answer yes, and that's because the audio output from these devices are not balanced. Uses proprietary audio transformers and filters for total elimination of any spurious buzz and hum in the audio. Perfect frequency response of +.03 db from 20 to 20,000Hz. Eliminates ground loop noise between any audio source such as a notebook PC and audio equipment. GLI-3.5mm Stereo Audio Ground-Loop Isolator & Filter with 3.5mm connectors.

Line level ground loop isolator