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MVD Earth Box
Eliminate electrostatic Noise Improve Sound Quality

MVD-EARTH grounding box actually works to achieve improved sound performance of your audio system through noise reduction. It's not the type of noise you can detect by putting an ear to a speaker when the music's not playing. Removing the crud caused by electrostatic fields makes music sound more dynamic, more musical and with greater clarity. 

Noise - Think Outside the Box

  • In its broadest definition, noise is any undesired signal

  • Analog signals accumulate noise as they flow through system equipment and cables

  • Once noise is added, it's essentially impossible to remove it without altering or degrading the original signal. Therefore, noise must be prevented along the entire signal path.

  • Signal INTERFACES are generally the danger zone, rather than the equipment itself.

An Overview of Audio System Grounding & Interfacing Common-Impedance Coupling
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Two currents, power-line and signal, flow in the same impedance, which allows them to couple!

Technically, this coupling mechanism is called “common-impedance coupling” because an impedance (resistance) is “common” (shared) to two circuits. One circuit is between device A output and device B input (the signal circuit) and the other is between the AC power connections at each device. In this example, since there are no safety ground connections, the current in the second circuit is due to “leakage current” (which flows from power-line to chassis in each device). The “common impedance” is, of course, the resistance of the grounded conductor (usually, but not always, the shield) in the interconnect cable.

As electronics developed, the common return paths of various circuits were also referred to as “ground,” regardless of whether or not they were eventually connected to earth. In addition, a single ground circuit most often serves, either intentionally or accidentally, more than one purpose. Thus, the very meaning of the term ground has become vague, ambiguous, and often quite fanciful. Some engineers have a strong urge to reduce these unwanted voltage differences by “shorting them out” with massive conductors — the results are most often disappointing. Other engineers think that system noise can be improved experimentally by simply finding a “better” or “quieter” ground. Many indulge in wishful thinking that noise currents can somehow be skillfully directed to an earth ground, where they will disappear forever!

We have talked about electrical noise and what can be done to minimize the noise. All the electrical noise in the world doesn’t matter a bit unless it affects the signal. On the other hand, just a tiny bit of electrical noise can wreak havoc if it shows up in the wrong place. In order for the noise to affect the signal it must be routed in such a way as to interact with the signal. Careless mixing and interaction of grounds is the biggest cause of audible degradation of the music in an audio system, so let’s take a look at how this works.

To understand what can go wrong you need to understand something called Common Impedance Coupling. Simply stated, Common Impedance Coupling is the way that noise gets mixed in with a signal. Noise can get mixed with the signal in a couple of ways: first, “conductive coupling,” when two circuits share the same path, and second, “radiated coupling,” when noise from one circuit is radiated into another circuit carrying the signal.

Two forms of Common Impedance Coupling

The circuit on the left of upper figure shows two current loops, one loop with the signal and a second noisy loop. Impedance Z1 is a sensitive spot in the circuit, perhaps a signal reference buss, which is common to both loops. The signal current, I1, and the noise current, I2, both pass through Z1 creating a voltage that is the product of the impedance and the sum of the two currents. The circuit on the right of figure also shows two current loops, one with the signal and the other with noise. In this case the sensitive impedance, Z2, is not common to both circuits.

However the two loops are situated such that there is capacitive or inductive coupling between them and the noise voltage is coupled into the signal loop. The resultant current is a composite of the signal current and the noise current which creates a voltage across Z2 that contains a mix of the signal and noise. There are two loops in each of these examples, but in reality the Common Impedance Coupling could be the result of several loops or a combination of conductive coupling and radiated coupling.

An example of a problem caused by radiated coupling is with the orientation of transformers in a vacuum tube amplifier. Depending on the orientation of the transformers with respect to each other, the output transformer may pick up the radiated field from the power transformer, causing an audible hum. Simply rotating one of the transformers may be sufficient to remedy the problem. Otherwise, increasing the distance between them will eliminate the problem.

Believe in again breakthrough!  Refer to the rich experience and application research from our grounding system, iEARTH makes it perfect.

The MVD-EARTH box is made from a solid carved aluminum body with two substantial solid grounding modules top with 4 receptacles for linking up grounding system with the noise pickup pole. Although this is a small device, it is quite substantial in weight and feel.  New Earth Box, MVD-EARTH, is based on the same technology found in iGROUND cable and iBLOCK MVD.

The improvement in sound for Stream Player, Media Players, SACD/CD Players, DACs, LP turntable system, Speaker system, AV home theater system, projector, TV set and just about all other audio equipment hooked up with MVD-EARTH is quite significant sounding. The soundstage, bass, and definition of instruments and voices were enhanced.

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Following list of alternative applications with corresponding MVD-Earth Box:

  • Turntables – Connect EBP-3 on grounding of turntable or Chassis Ground 

  • Phono Stage – Connect EBP-3 and EBA-3 to spare Input, Output or Chassis Ground

  • SACD/CD or Streaming transport -- Connect EBD-3 to spare Digital Output or Chassis Ground

  • Digital to Analog Converters (DACs) – Connect EBD-3 and EBA-3 to spare Digital Input, Output or Chassis Ground

  • Stream or SACD/CD player or transport -- Connect EBD-3 to spare Digital Input, Output or Chassis Ground

  • Stream or SACD/CD player --  Connect EBA-3 to spare Analog Input, Output or Chassis Ground

  • Pre-Amplifiers – Connect EBA-3 to spare Analog Input, Output or Chassis Ground

  • Power Amplifiers – Connect EBA-3 to spare Analog Input, Speaker NegativeTerminal (–) or Chassis Ground

  • Loudspeaker – Connect EBS-3 to Speaker NegativeTerminal (–)

  • USB Devices – Connect EBD-3 to spare USB Input, Output or Chassis Ground

  • Network Devices – Connect EBN-3 to spare LAN port Output

  • TV set, TV top box or Projector -  Connect ENV-3 to spare HDMI port Input

  • AV processor, AV integrated amplifier or media player -  Connect EBV-3 to spare HDMI port Input or Output

  • Any Component with an active circuit inside – Connect EBA-3 or EBD-3 to spare Input, Output or Chassis Ground

  • Measurement –  6.0" x 3.4" x 2.2" (15.5 x 8.5 x 5.5cm)

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EBA-3 Earth Box for Analogue     USD$750/set  0.8m RCA to banana DCT3 Silver Ion Plated 6N OCC connecting cable
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EBD-3 Earth Box for Digital     USD$750/set  0.8m RCA to banana DCT3 Silver Ion Plated 6N OCC connecting cable
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EBN-3 Earth Box for Network   USD$750/set with 0.8m RJ45 to RJ45 DCT3 Silver Ion Plated 6N OCC connecting cable
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EBP-3 Earth Box for LP system   USD$750/set with 0.8m RCA/small spade to banana DCT3 Silver Ion Plated 6N OCC connecting cable
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EBS-3 Earth Box for Loudspeaker system   USD$750/set  with 1.2m spade <---> banana DCT3 Silver Ion Plated 6N OCC connecting cable
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EBV-3 Earth Box for AV system    USD$750/set  with 0.8m HDMI to HDMI DCT3 Silver Ion Plated 6N OCC connecting cable
** Due to continuous product improvement, actual product might be varied from product's picture.
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