MI SPEAKER CABLES
 
                The Lowest Inductance on the market
 MI Speaker Cables

The patented Goertz MI cable, invented by Ole Goertz, a Danish electronics and audio engineer, eliminates distortion between amplifier and loudspeakers. Patented in 20 countries, Goertz wire is flat by design. It's form follows function, in the best design tradition. We set out to create an electrically correct pathway between amplifier and loudspeaker, which required replacing typical cable psuedo-science with solid physics. Research showed that the perfectly flat shape, with minimum space between conductors, was the best way to achieve this.

But developing such a wire is a different proposition. Many audio companies do not even manufacture their own wire; packaging and marketing the products of others instead. As a primary maker of high-tech laminated conductors for industrial electronics applications,

Alpha-Core was uniquely suited to transform the promising Goertz design into reality. Using the dielectrics Polyester Terapthalate and Teflon applied around each solid rectangular conductor, we achieved an
extraordinarily thin profile between the two stacked wires. To provide maximum protection while maintaining thinness, the cable sandwich is then sheathed in tough, high grade polymer.

The result is a wire with a characteristic impedance that closely matches the impedance of loudspeakers. Alpha-Core's Goertz MI wire presents 2 to 4 ohms characteristic impedance as opposed to the 50 to 200 ohms presented by even the most expensive speaker cables. This correct electrical matching results in improved stereo imaging, better clarity, less high-frequency roll off and better low frequency definition.

Goertz Improves all Frequency Ranges:
LOW . . . MIDRANGE . . . HIGH
The degree of distortion along a loudspeaker cable depends on its resistance ( R ), inductance ( L ) and capacitance ( C ). Resistance is dependent on length and conductor cross section. A low resistance provides superior damping between the amplifier and the speaker diaphragm, governing its ability to convey a true, powerful bass and lower mid-range. A high cable inductance causes loss of signal strength towards the high end of the audible range (roll-off). It also causes frequency dependent phase-shift which disturbs true stereo imaging. The square root of the ratio L/C is termed Characteristic Impedance, and is a quality inherent in a cable, dependent on its geometry and materials, but not dependent on its length.

Goertz Virtually Eliminates Mismatch
The characteristic impedance of the Goertz MI cables in the order of 2 to 4 ohms closely matches the impedance of loudspeakers. Almost all other speaker cables have characteristic impedance ranging from 50 to 200 ohms, a mismatch which causes distortion due to signal reflections. Impedance matching primarily improves the clarity of the highs and upper mid-range, but many users have also experienced improvements in the lower mid-range. The cause seems to be that signal reflections caused by impedance mismatch enter the feedback loop of many amplifiers and disturb their ability to reproduce faithfully even lower frequency signals.
Thick on Benefits, Thin as a Penny
The low inductance and characteristic impedance of Goertz cables are due to their flat construction and the nature of their insulation and jacketing material. The configuration places the heavy, solid conductors only 0.003 inches apart. The cables are 0.4 or 0.8 inches wide, and only 0.04 inches thick. As thin as a penny.

Perfect for Home Theater
Goertz MI speaker cable and interconnects are perfect for home theater applications. Due to the low inductance characteristics, Goertz audio products are ideal for long runs. No more positioning your equipment based on the limitations of your cable system. Dolby Digital home theater design requires full range audio frequencies be sent to rear speakers; Goertz cable allows extreme accuracy at any length. The space ratio, the relationship between conductor cross section, is about 50% in Goertz MI cables versus 5-20% in most other speaker cables. In other words, Goertz cables pack heavy conductor cross sections into an extremely slim package yielding greatly improved highs and mid-range, plus a truly powerful bass. Thanks to the flat construction and extreme compactness, they can be drawn anywhere and routed under thin carpets and wallpaper. If desired, paint with oil or water based paint.
What makes them so special?







Figure 1 is Goertz MI 1 (MI 2 is almost the same thickness, but twice as wide). Each conductor is a 0.375 by 0.010 inch solid band of high purity oxygen free copper (OFC) surrounded by a 0.0051 inch thick sheath of the space age insulation polyester terapthalate. The conductors are placed in close mutual contact within a 0.005 inch thick clear jacket. The mutual distance between the conductors is 0.003 inches and the overall dimensions of the cable are approximately 0.4 by 0.040 inches. The space ratio is close to 50%. The conductor cross section approximates 13 AWG, shown approximately twice actual size.

Figure 2 is a section through a competitor's cable extruded from clear PVC, having two stranded conductors of many fine copper wires. The space ratio of this style cable varies between 10% and 20%.

 

Figure 3 is a so called "multiple bandwidth" or "time compensated" cable with two larger and two smaller conductors twisted together inside a common jacket. The two differently sized conductors are used in parallel. The manufacturer claims that the treble components will travel along the lighter conductor, and the bass frequencies along the heavier conductors. The space ratio is 5% to 10%.

 

The Proof: Oscilloscope readings comparing the performance
of a Goertz cable with conventional designs.



Figure 4 illustrates comparative measurements using a 12 kHz square wave transmitted via (I) a 25 foot Goertz cable, and (II) a 25 foot speaker cable of conventional bi-wire construction, both driving a 4 ohms loudspeaker. The characteristic impedance of the two cables are (I) 4 ohms and (II) 100 ohms. (A) is the signal at the amplifier, and (S) is the signal at the speaker.

Time Base = 10µS
Channel 1 V/DIV = 0.5 V
Channel 2 V/DIV = 0.5 V

It is evident that (I) is entirely distortion free, showing only the unavoidable power loss due to cable resistance. (II) in contrast indicates a clear leading edge spike at the amplifier, and significant distortion or roll off at the speaker terminals.




Goertz MI 1(Copper)/AG1 (Solid Silver) 
The original Goertz cable, MI 1 in 13 gauge (AWG) solid Oxygen Free Copper (OFC) or 12 gauge AG 1 in solid High Purity Silver. The heavy, high purity Oxygen Free Copper (OFC) or solid high purity silver ribbons are sandwiched together, separated only by micro-thin layers of film insulation. The minute amount of active dielectric also provides rapid break-in; now audiophiles don't have to wait tens of hours to break in their cables, Goertz cables produce immediate results!

Goertz MI 2(Copper)/AG2 (Solid Silver)
MI 2 Heavy 10 gauge OFC copper or 9 gauge AG 2 solid silver cabling for improved bass and power handling over the remarkable Goertz MI 1. Great reviews confirm that this remarkable cable really delivers; superb bass control, vivid mid-range, and excellent high frequency extension combine with rejection of interference and no break-in period. Simply great value.

Goertz MI 3 (Cooper)/AG3 (Solid Silver)
Alpha-Core's "Big Boy" 7 gauge speaker cable; the answer for powerful audiophile systems. MI 3 was designed for high power amplifiers driving full range speakers. Perhaps the best speaker cable made today, the MI 3 delivers sublime clarity, dynamics, and definition throughout the audio spectrum. The extreme low DC resistance ensures diaphragm control for tight, powerful bass and mid-range, and the low inductance carries distortion free highs frequencies and crucial harmonics for outstanding imaging and depth perception.

Goertz 7 gauge MI 3 cables were developed at the request of Dan D'Agostino of Krell Industries and other customers who were seeking a speaker cable to complement today's powerful amplifiers. Double the cross section of Goertz MI 2 and AG 2, this newcomer features two solid conductors each measuring 1.25" by 0.012". As in Goertz MI 1 and MI 2, the micro-thin film dielectric means minimum break-in time.

The 7 AWG cable is available in two versions: The MI 3 'Divinity' in OFC copper, and the AG 3 'Divinity' in solid fine silver. Both are supplied with four inch user-friendly pigtails, and both feature Alpha-Core's unique solid fine silver spade connectors to fit all high-end binding posts. Goertz AG 3 is arguably the heaviest solid fine silver cable ever made. An eight foot pair contains more than a pound of 99.99% pure silver. So, for that extra muscle to drive the really powerful systems, Goertz MI 3 or MI AG 3 is the answer, The Alpha-Core "Big Boys" deliver punch in the bass and a sound so revealing that we maybe ought to mark them "Adults Only".

Specifications

Goertz Cable

Conductors/
Cross Section/
Equivalent Gauge

Resistance/
Capacitance/
Inductance/
Impedance

Dielectric Material/
Outside Dimensions

Goertz MI 1:
'Center Stage'

High Purity
Oxygen Free Copper
.375 x .010"
13 AWG

0.0044 ohms/ft
0.5nF/ft
10nH/ft
~ 4 ohms

Polyester Terepthalate/
Polycarbonate
0.4 x 0.04"

Goertz MI 2:
'Veracity'

High Purity
Oxygen Free Copper
.750 x .010"
10 AWG

0.0022 ohms/ft
0.95nF/ft
6nH/ft
~ 2.5 ohms

Teflon/ Polyester Terepthalate/
Polycarbonate
0.8 x 0.04"

Goertz MI 3:
'Divinity'

High Purity
Oxygen Free Copper
.1.25 x .012"
7 AWG

0.0011 ohms/ft
1.5nF/ft
4nH/ft
~ 1.7 ohms

Teflon/ Polyester Terepthalate/
Polycarbonate
1.3 x 0.08"

Goertz AG 1:
'Center Stage'

High Purity
Solid Fine Silver
.375 x .010"
12 AWG

0.0034 ohms/ft
0.5nF/ft
10nH/ft
~ 4 ohms

Polyester Terepthalate/
Polycarbonate
0.4 x 0.04"

Goertz AG 2:
'Veracity'

High Purity
Solid Fine Silver
.750 x .010"
9 AWG

0.0017 ohms/ft
0.95nF/ft
6nH/ft
~ 2.5 ohms

Teflon/ Polyester Terepthalate/
Polycarbonate
0.8 x 0.04"

Goertz AG 3:
'Divinity'

High Purity
Solid Fine Silver
1.25 x .012"
7 AWG

0.00098 ohms/ft
1.5nF/ft
4nH/ft
~ 1.7 ohms

Teflon/ Polyester Terepthalate/
Polycarbonate
1.3 x 0.08"

Temperature Rating:   
Termination Styles:

-40°F to +270°F | Maximum Operating Voltage: 300 Volts
Bananas/Copper Spades/Pins/Silver Spades/Hybrid/T (auto-style) in Single
and Bi-wire Configurations

Ordering Information

Any length terminated and 25/150/500 foot bulk spools