Cardas RCA Clear Sky 2m
Overview
The Cardas Clear Sky cable represents the entry point into the refined universe of the Clear range from the American manufacturer Cardas. Designed with patented synchronized propagation technology, this RCA interconnect cable delivers remarkably precise sound reproduction. Its meticulous construction, based on golden ratio proportions, and its high-quality materials make it an ideal solution for audiophiles looking to significantly enhance their system’s performance without reaching the price levels of the higher-end models in the range.
Revolutionary Technology in the Service of Musicality
At the heart of the Clear Sky’s innovation lies its synchronized propagation technology, for which George Cardas was granted US patent no. 7,674,973 in March 2010. This approach solves a fundamental problem that has affected audio cables since the invention of the telephone: the mismatch between the speed of electrical signal propagation in the conductor and that in the dielectric (insulating material).
In a conventional cable, the electrical signal travels at the speed of light in the conductor, while the charge propagation in the dielectric is limited to about 70-78% of that speed. This discrepancy creates interference that alters the integrity of the musical signal.
George Cardas’s ingenious solution is to intentionally slow down the signal propagation in the conductor so that it matches precisely that of the dielectric. This synchronization is achieved through extremely precise geometries and pitch lengths in the arrangement of the conductors. The result is a remarkably faithful signal transmission, preserving the integrity of even the subtlest musical information.
A Balanced and Revealing Sonic Signature
The acoustic performance of the Clear Sky is characterized by exceptionally clear sound reproduction, as its name suggests. Its unique design provides a notable improvement in neutrality, dynamics, and high-frequency extension.
When listening, the Clear Sky stands out for its ability to render the finest details with great precision, without ever becoming analytical or harsh. Attacks are delivered with conviction, bass is powerful and well-defined, while the midrange offers a striking wealth of information.
Unlike many cables whose performance varies with length, the Clear Sky maintains its exceptional sonic qualities regardless of length, making it a versatile solution suitable for any system configuration.
Listeners will particularly appreciate the Clear Sky’s ability to create a wide and precise soundstage, where each instrument finds its natural place. Music gains in coherence and fluidity, allowing for extended listening sessions without fatigue.
High-Precision Connectors
The Clear Sky’s RCA terminations use the GRMO connectors developed by Cardas. These non-magnetic connectors are made from eutectic brass with rhodium over silver plating, ensuring optimal conductivity and long-term resistance to oxidation.
The connector manufacturing process receives special attention: crimping is done manually at room temperature, preserving the cable’s conductive properties by avoiding heat-induced material alteration. This artisanal method contributes to the product’s overall sound quality.
The junction between the cable and the connector is protected by a flexible sleeve that enhances durability while maintaining the flexibility needed for easy installation.
Technical Specifications
Audio Performance
- Sonic transparency: clear, detailed, and uncolored sound
- Dynamics: precise reproduction of micro and macro dynamic details
- Neutrality: balanced sound signature with no frequency emphasis
- Versatility: performs well over both short and long lengths
- Compatibility: suitable for any high-end audio system
Design and Materials
- Conductors:
- Type: Kevlar core with optimized propagation
- Material: 99.9999% pure oxygen-free copper (Grade 1)
- Coating: transparent SPN (Litz) insulation
- Sizing: dimensions based on Golden Ratio proportions
- Gauge: 2 × 23.5 AWG
- Geometry:
- Internal structure: shielded twisted pair
- Insulation: non-conductive polyethylene air tubes
- Support: ultra-thin FEP tape
- Shielding: tinned copper braid suspended in a layer of compressed air tubes
- Outer jacket: extruded Alcryn rubber
Connectors
- Standard RCA connectors: Cardas GRMO
- Materials:
- Eutectic brass body
- Gold-plated brass connectors
- Rhodium plating over silver
Physical Specifications
- Outer diameter: 9.5 mm
Frequently Asked Questions
What is the difference between the Clear Sky and other cables in the Cardas Clear range?
The Clear Sky is the entry-level model in the Clear range, offering a significant portion of the technological and sonic benefits of the higher-end models at a more accessible price. Higher-end models like the Clear Light, Clear, and Clear Beyond use more sophisticated conductors and even more refined materials, pushing performance further in terms of resolution and transparency, but at much higher prices.
How does synchronized propagation technology concretely improve the sound?
This technology solves the problem of time lag between the signal in the conductor and that in the dielectric, which typically creates interference. By synchronizing these two speeds, the Clear Sky eliminates a major source of distortion, resulting in a more precise stereo image, better instrument separation, and a more natural rendering of timbres and transients.
Why is golden ratio-based geometry important in cable design?
The golden ratio (approximately 1.618) is a mathematical proportion frequently found in nature and considered particularly harmonious. In Cardas cables, this proportion guides the arrangement of conductors of different sizes, creating a structure that minimizes mechanical and electrical resonances. This reduces unwanted sonic coloration and achieves a more neutral signal transmission.
What is the difference between the RCA and XLR versions of the Clear Sky?
The RCA version uses an unbalanced (or single-ended) connection with two conductors (signal and ground), while the XLR version uses a balanced connection with three conductors (positive signal, negative signal, and ground). The XLR version generally offers better noise rejection over long distances and can provide a higher output level. The cable’s internal structure is adapted to each connection type to optimize performance.
Is the Clear Sky directional?
Yes, like most Cardas cables, the Clear Sky is directional. An arrow or marking on the sleeve indicates the recommended direction of signal flow, from the source component to the receiving component. This directionality is related to the asymmetric structure of the conductors and the orientation of the dielectric molecules during manufacturing. Following this direction optimizes the cable’s sonic performance.
- Eco-contribution included in the sale price.