Core Power Technologies Equi=Core 50 Fully Balanced Power Isolation Transformer

Rated 5.00 out of 5 based on 3 customer ratings
(3 customer reviews)

$ 499.00

Introducing the Sound of Silence, the Core Power Technologies “Equi=Core” Line of Balanced Power Isolation Transformer Systems.core power plug

Eliminate noise and hum in your system through the clever use of “Common Mode Rejection” CMR technology in the Equi=Core 50 Fully Balanced Power Cable System at $499 MSRP.

  • Extensively used in small recording studios and High end audio installations
  • Eliminates mains interference by Common Mode Rejection
  • Increase S/N Ratio by up to -15 dB
  • True Balanced 120v Power (No 220v available)
  • Removes Power Line Noise & Hum
  • Eliminates Ground Loops in House Wiring
  • Reduces Radiated Fields from Power Cords
  • Soft Start Protects Equipment From Turn-On Surges
  • Reduces Interference Between Equipment
  • Made in the USA

    "With the EQUI=CORE, everything seemed so much more three-dimensional and effortless, and was stunned to hear small cues all throughout that I’ve never heard before"

    “With the EQUI=CORE, everything seemed so much more three-dimensional and effortless, and I was stunned to hear small cues all throughout that I’ve never heard before”


Note: Free Shipping in the USA. 

Add Matrix 2 Power Distribution, 6 outlets

Add Matrix 2 Power Distribution, 6 outlets

Out of stock


What is Balanced Power?

In much the same way that balanced audio lines can eliminate hum, electromagnetic interference (EMI), and noise, the use of balanced AC power lines in sensitive audio, video, or computer installations can make an enormous difference in system noise and signal integrity. But power distribution in North America, unfortunately, is not balanced. The distribution standards currently in use were derived from practices established over a century ago, when electric power use was limited to lighting and motors —long before any AC noise sensitive applications existed. The emphasis then was on convenience (from the power utilities — standpoint) and safety, but not noise cancellation

Balanced power is not a new design or approach in power conditioning, however up till now its been uber expensive
because only small group of manufacturer’s on the planet specialize in selling Balanced Power. It’s a rather simple concept; in your home, the AC wall socket that you normally use has three conductors: hot, neutral, and ground. Normally, if you measure the hot to ground you should get 120 volts, and if you measure the neutral to ground you should get 0 volts, but more often than you would imagine this is not what happens, i.e., hot vs. ground might be far less than 120 volts, and neutral vs. ground might be far more than 2 or 3 volts. These offsets produce common mode AC line noise that becomes audible in your audio system.

In a balanced AC circuit, hot vs. ground, and neutral vs. ground will both read 60 volts. In other words, the hot and neutral conductors are both at 60 volts. Since these voltages are of opposite polarity though, and given that most interference in a typical AC line is common between the two lines, the noise in the lines is eliminated when the two lines are added together. This is effectively known as Common Mode Rejection (CMR).

Typical AC Sinewave Before Equi-Power

Typical AC Sine-wave Before Equi-Power

Perfect Noise Free Sine-wave with Equi=Power

Perfect Noise Free Sine-wave with Equi=Power


You also see this principle put to use in audio systems that use a balanced topology. Knowledgeable audiophiles know that when they feed their preamp output to a power amp input using Balanced XLR connections, the signal to noise ratio improves by a significant amount, up to another -10 dB quieter, making any system sound its best by just connecting it using the balanced inputs and outputs. This is how professional recording studios are wired, for the lowest level noise floor possible.

power-audit-bannerThe AC power delivery should be balanced now too. Do you know how much power your system consumes? If not, let us help you figure it out with our Free Power Audit, tell us what components you want to run on Balanced Power and we’ll tell you which model is right for your needs, including the output cable side length that feeds your system’s main AC hub or power strip.

In most systems, the power consumed by sources like a Blu-ray player, digital media player, DACs, preamps, and DVRs, is well under 150 watts. We recommend a separate 300 for Class D power amps up to 135 watts per channel x 2. Class AB amps up to 75 watts x 2 are OK to use with a 300 as well. Highly recommended for tube based systems.

Additional information

Weight 14 lbs
Dimensions 18 x 10 x 6 in


Core Power FAQs

What is balanced power?

When 120-volt AC power is balanced, one side of the circuit has +60 Volts to ground while the other has -60 Volts to ground. (Across the circuit, the usual 120 Volts is still present. Fig. 1) A European 230 Volt balanced power system has +115 Volts and -115 Volts to ground on the conductors.

Standard unbalanced AC power systems have a “hot” conductor and a “neutral” conductor. In the US, the “hot” conductor nominally has 120 Volts to ground and the “neutral” conductor has 0 Volts to ground.Europe has a similar system but with 230 volts on the “hot” and 0 Volts on the “neutral.”

In a balanced power system, the voltages on the system’s two output terminals are 180 degrees out of phase to each other with respect to ground. The system reference (ground) originates at the output center tap of an AC isolation transformer. In other words, the system’s grounding reference (zero position) is located at the system’s mean voltage differential or zero crossing point of the AC sinewave. This is a far more effective way to establish a reference potential for an AC system. The center tap is then grounded to Earth for electrical safety and for referencing shields.

There is never any voltage or current present on the ground reference in a balanced power system. Transient voltages and reactive currents which normally would appear on the neutral and ground wires are also out of phase and likewise, sum to zero at the ground reference thereby canceling out AC hum and noise.
A balanced AC Power system works the same way as a balanced audio circuit but with a higher amplitude. Both balanced audio and balanced AC incorporate phase cancellation or common mode rejection to eliminate noise.

Why do I need balanced power?

Power standards for electrical distribution were adopted many decades ago and haven’t changed significantly since. With the advent of sensitive electronic applications, electrically induced interference has become a matter of concern to engineers. When electrical interference is present in any sensitive electronics, equipment performance will be limited by the noise. The problem is critical in many areas of high-tech electronic engineering, among them, the sound recording and video industries. A very low noise level is crucial in these areas because literally, the noise can be seen and heard.

The dynamic range of the entire electronic signal chain determines the quality of the final product in all recording environments. The presence of any electrical interference at all lowers the S/N ratio of the recording. This limits the subtle detail and realism of the sound or image. Low level signals are lost in the noise floor of the system.

Sound quality can also be affected by intermodulation distortion occurring as a result of the presence of ac noise in the audio or digital signal bandwidth. Even if the noise level is inaudible, it is likely that program material will be colored by the presence of electrical interference.

In more sophisticated areas of application, for example high-end digital signal processing (such as broadcast automation or even MDM recording), unacceptable error rates are often attributed to background electrical interference. Digital jitter is the “smoking gun” that points to high frequency AC noise. Digital jitter is caused in part by high frequency electrical interference approximating the bit stream rate of the digital signal.

Balanced power eliminates all of these problems because there is never ac interference present on the ground to invade signal circuits. Balanced power often increases the dynamic range of a recording system by 16db or more. When balanced power is applied, ground loops and hum problems, even subtle ac noise coloration becomes a thing of the past. The difference can be astonishing.
How is balanced power used?

A balanced power system may be located anywhere along the ac power grid provided that it is the last link on the chain feeding power to electronic power supplies. The balanced power system can be engineered to blanket an entire facility through electrical hard wiring or a smaller balanced power system can be plugged into a grounded ac wall outlet.

The popular rack system design is the easiest of all systems to use. One simply plugs the system into a conveniently located ac outlet and then plugs the studio equipment into the outlets on the back of the rack system. Plug strips are fine to use as long as they are simple. Spike protection is included in the Equi=Core system — redundant surge and spike protection is generally unnecessary. It is strongly recommended that all ground lift adapters be discarded and all audio cable shields be grounded at both ends.

Uninterruptable power supplies and power conditioners may be used with balanced power systems but they should be located between the ac grid and the Equi=Core system. They should also be rated to handle the full capacity of the Equi=Core.

For more information on hardwire installations see Article 530 Part “G” of the 1996 National Electrical Code.

Is there any danger to my equipment?

No. Particularly if the equipment in question is listed by Underwriters Laboratories or another recognized testing laboratory. The voltage and frequency applied to a power supply is exactly the same. Only the grounding reference is changed.

Though unbalanced (standard) ac power has a neutral conductor, UL standards specifically prohibit the use of a neutral as a grounding reference even though it has zero volts.

If the neutral side of a power supply were to be grounded, it would immediately cause actuation of the output breaker on the balanced power system thereby shutting the system down.

Even if the ground was lifted on the ac cord and the neutral side of the power supply was improperly grounded to the chassis, touching the chassis would result in a 5 millisecond shock at only 60 Volts before the system sensors detected excess ground leakage and shut the system down.

The electrical code requires redundant safety measures be incorporated into all balanced power systems protecting both equipment and personnel from harm.

How large of a balanced power system do I need?

There are a number of ways that system size can be determined. The objective is to provide a power system with sufficient current capacity to drive all of the load. Sometimes, it is a simple matter of counting the number of AC circuits needed to hold the studio’s load with everything turned on. If only one outlet can run everything, a 15- or 20-ampere rated system is adequate.

The simplest way to determine a system’s power requirement is to add up the power ratings on the nameplates on the back of all of the equipment. Normally, DACs, Servers, Preamps, Turntables, Source devices, synth equipment, samplers, compressors and effects equipment load is negligible. These units commonly draw only 30 or 40 Watts — about 1/4 ampere each. MDMs draw about one ampere each.

PCs and workstations rarely draw more than about 3 amperes (including monitor unless the monitor is very large.) Consoles can range from 3 or 4 amperes for a typical 24 x 8 buss board to as much as 20 amperes for some of the larger boards. Note also that some very large boards with automation power supplies can draw as much as 60 Amps or more. Frequently, these power supplies are located in a machine room in a separate rack of their own. Often one large rack system (7.5 or 10kVA) can handle all of the automation power supply load. Tape transports and power amplifiers use a lot of power too. Often a tape transport will require 10 to 12 amperes in fast forward or rewind mode. Power amplifiers vary. The rule of thumb is 2 AC Watts per audio Watt (into 8 Ohm, Class AB).

How do I set up the AC and audio grounding?

This is very simple. There are 2 basic rules to follow:
1.) Ground everything
2.) When in doubt, ground everything

Can I use balanced power on just some equipment and still get good results?

Wherever possible, it is recommended that balanced power be used to cover the entire production facility including remote equipment that is interconnected through a/v cables. There are, however, acceptable wiring methods that have proven to work well when the supply of balanced power is limited in an area or where remote equipment running on unbalanced AC is patched into the balanced system. The approach to such situations is similar in every case.

A good example of this approach is in live sound reinforcement applications where amplifier load can be extremely large. Power amps usually add very little noise to a sound system. Most of the noise in a typical P.A. system is created in the front of house gear, the back line amps and instrument racks. These are the primary areas to be covered with balanced power — areas where low level signals are being processed. Mic preamps, guitar amps, instrument preamps and effects fall under this low-level signal category. These components must run on balanced AC to demonstrate a significant effect on noise levels and to eliminate the source of possible problems before they occur.

When connecting a system running on balanced power and a system running on unbalanced power, the signal grounds of the systems need to be isolated. With balanced audio signals, lift the shields at the inputs. With unbalanced audio or video signals, use an isolation transformer.

These rules apply for remote hook-ups to permanent facilities, especially where one of the systems has not yet been set up for balanced power but the other has. Simply lift the shields at the inputs on the remote system in similar fashion as is common practice in most splitter snakes used in remote facilities.

When mixing balanced AC and unbalanced AC, keep in mind that a/v cabling is the primary path of grounding noise. Lifting audio shields at the inputs or using isolation transformers where systems are interconnected works well to eliminate interference anywhere unbalanced power must be used with balanced power. If fiber optics are used for all signal links, disregard all of the above and don’t worry about it.

3 reviews for Core Power Technologies Equi=Core 50 Fully Balanced Power Isolation Transformer

  1. Rated 5 out of 5

    “The presentation sounded SO much bigger and more dynamic, with deeper and more enveloping bass and a much deeper soundstage… and all this from a CD rip! The noise floor dropped noticeably lower, yielding a deeper blackness from which the sound could emerge.” Greg Voth, StereoTimes Summer 2016

  2. Rated 5 out of 5

    “In our opinion, this is one of, if not the best bang-for-the-buck
    improvements we have experienced…” Larry Borden – Executive Editor Dagogo Magazine

  3. Rated 5 out of 5

    “The CP Tech EQUI=CORE Balanced AC Power Source Cables punch way above their weight when it comes to performance versus price tag. Beginning at $499, they’re among the top AC cords I have heard!” Clement Perry, StereoTimes, March 2016

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