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The callus (concrete analogy geometry)

The callus constitutes the evolution of our the holograph loudspeaker cable but in a shielded version to avoid external signal interference. It is a hi-end loudspeaker cable carefully designed in order to achieve the best possible quality and excellent performance at a sensible price. Therefore, we mobilized every manufacturing detail, the best possible raw materials and our limit skills, creating a product simple yet very effective in accordance with our philosophy.
The callus will lower the noise floor of your beloved high fidelity system in order to hear significant improvements in dynamics and harmonic nuances along with a natural balance of music's fundamental tones to harmonic frequencies. You will also notice significant improvements in sound staging and ambience, a better low-level resolution and the clearest high frequencies you could ever imagine.

Consequently, by using this cable you keep your system's noise floor down in a way that the speaker cable became almost invisible providing a superb spacious character taking you closer to the music than ever before.

To accomplish that purpose callus consists of two complete separate pure silver cables applying our "
concrete analogy geometry", concerning the space between them and the cross-sectional conductors area plus the shield screen. Most speaker cables suffer from a distortion which opposes the original signal and is caused by the produced magnetic fields and interactions between the conductors when a current flows through them. By applying this "concrete analogy geometry" to the callus cable we minimize this phenomenon. Likewise, by keeping cross-sections quite small we effectively reduce skin effect.

Moreover callus features:

  • High thermal, chemical and mechanical stability, along with excellent hermetic factor providing a perfect protection against moisture penetration according to the third principle of our sToa 8 evolution technology.
  • Very efficient shield screen providing a perfect protection against radio frequency and other electromagnetic interference penetration.
  • Very low capacitance, permitting low and medium power -yet high quality- amplifiers, to easily offer full control over your speaker drive units.
  • Low inductance, offering significant velocity to speaker cable high current changes.
  • Constant conductor resistance, making the amount of energy -which inevitably will be absorbed by the cables- become stable, thus increasing signal resolution. (Cable resistance never causes any distortion, but it only decreases the volume of the sound since a certain amount of energy turns into heat).
  • High signal linearity, because there is only one path for the signal to travel, avoiding multi-stranded conductor cable distortion. (In multi-stranded cables the signal travels via different paths as a different version of the same kind and at different times).
  • The least possible conductor contact with the insulation material, according to the first principle of our sToa 8 technology, increasing velocity of propagation.

Callus is a flexible shielded speaker cable in a luxury black-gold color. It is composed of two complete separate quite heavy solid conductors that are specially made of 99.999% (5N) extra soft temper pure fine silver, which has the best conductivity of all metals.
The manufacturing process eliminates the conductors surface mechanical anomalies improving the electrical signal transmission properties, giving extremely low distortion especially in high frequencies. In addition each one of them is perfectly cleaned in a two-stage cleaning procedure.
In the first stage a strong cleaning process eliminates corrosion, and polishes the surface in order to increase conductivity. In the second stage, by using a special liquid we make a deep final cleaning of the subtraction remains from the first stage, preparing the conductor surface treatment.
To eliminate the problem of silver corrosion in the course of time, a thick liquid treatment oil is being used, specially designed for this purpose. The same oil is standardly applied to all our extra soft temper pure fine silver conductors. The result is a time-lasting stable product capable of avoiding chemical attacks, protected from atmospheric pollutants. This liquid treatment also works:

  • As a metal to dielectric suspension, reducing the vibrations coming from the current running through the audio cables and the loudspeakers themselves, rendering any microphonic effects insignificant.
  • As a lubricant, reducing dramatically the friction between the silver conductor and the dielectric tube avoiding the static electricity (conveyance of electrons) distortion.

By using a specific process, each end of our silver conductors is perfectly polished, thus becoming elliptical to avoid electric evacuations.
The insulation tubing of the conductors is made of PTFE, which is the original TeflonŽ formulation and has the lowest dielectric constant of all plastics, specially treated for better cushioning. A specially made treatment lacquer is applied directly on the Teflon conductors insulation tubing according to the third principle of sToa 8 evolution technology.
Our patented Natural Flow Cooling System keeps the conductors temperature stable and quite low, increasing conductivity and eliminating farther corrosion as any chemical activity.
A very flexible PVC layer is applied over each of the two TeflonŽ insulated silver conductors stabilizing the entire system and providing excellent flexibility, electric insulation, and durability.
The shield screen consists of metallized braided mylar sleeves reducing and practically eliminating the external Electromagnetic (EMI) and the Radio Frequency Interferences (RFI) signals, grounded only at the amplifier end of the cable in order to avoid the creation of a parallel circuit (ground loop). This screen, surrounded by a luxury black-gold color halogen free polyethylene jacket, drains away all unwanted noises to the ground of the signal source.
Furthermore this cable is completely airproofed by carefully isolating the sensitive silver conductors out of the atmosphere using our patented Cables airproof mode. A suitable cylindrical elastic o-ring is properly placed near each cable connector covering and tightening the external jacket, thus isolating the sensitive silver conductors from the atmosphere and the penetration of humidity.

Finally by twisting the two separate solid conductor cables together we reduce the interactions between them.

Total cable inductance (resistance to changing current) is a very low 1.44 microH/m.
The resistance per lead is 0.021 Ohm/m.
Total cable weight remains remarkably low (41gram/m) in order to protect your delicate equipment sockets.

Callus is available with gold plated banana speaker connectors***. Before lead-free and halogen-free silver soldering, we apply pressure to stabilize the conductors and ensure a suitable low resistance contact. The process of melting and solidifying takes place within narrow temperature ranges so that the surface of the solder joint remains smooth and corrosion-protected. This connecting method seems to provide the best signal transfer results. A thick liquid treatment oil is applied on the solder surface as on all speaker connectors to eliminate corrosion increasing contact electrical stability.

Ultimately, as with all our cables, callus is being carefully checked and separately measured in our laboratory by a highly skilled master technician to ensure a reliable product offering a significant upgrade to your valuable beloved system.

Before packing we use our Cables Demagnetizing Method neutralizing all metal and non-metal parts on them in a three-stage procedure. Callus is carefully packed in a luxury real wooden box specially designed to protect this cable and prevent any damage. Each of our wooden boxes has a unique serial number same as the cable. Inside you will find all documents and instructions manual required plus a bottle of our pastra advanced antistatic cleaner as a gift.

The callus, if registered, comes with a 6-year warranty against manufacturing defects. We also offer a 30-day trial period and a money-back guarantee by refunding the purchase price minus a 5% restocking fee. However, buyer is responsible for the return shipping costs. Please contact your local distributor-dealer for more information.

The production of the callus speaker cable lasts about two weeks. Please contact your local authorized distributor for ordering and any information concerning delivery. Alternatively, please feel free to order your callus shielded speaker cable by using our premium online sales shop


Callus specifications *


1.44 uH/m (0.44 uH/ft) at 1Khz


0.0211 Ohm/m at 20°C


0.0064 Ohm/ft at 20°C

Capacitance (Total cable)

19.2 pF/m (5.85 pF/ft) at 10Khz



2 x Silver 99.999 %


concrete analogy geometry


treated PTFE-Teflon tube


metallized braided mylar sleeves


PVC - polyethylene


Gold plated banana



External diameter

7.2 mm

Total weight

41 gram/m

Lengths available

1.3, 2.0, 2.5 meters**


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Comparative tables

Remarks: concrete analogy geometry, sToa 8 evolution technology, shielded, patented Natural Flow Cooling System, patented airproof mode, factory mounted gold pleated connectors, lead-free and halogen-free silver soldering, halogen free jacket, low weight, unique serial number, luxury real wooden box, demagnetized.

The right to change specifications without notice is reserved by the Manufacturer.
Any other length can be custom made on your demand.
***Available with gold pleaded spade connectors on your demand.

**** 6 years warranty against manufacturing defect.

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Custom made callus

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Presentation of our the callus shielded speaker cable at the "HXOS" magazine.

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Presentation of our the callus shielded speaker cable at the "AVmentor" internet audiophile magazine.

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