Audioquest Big Sur Jack/RCA 5m
Overview
Connecting a smartphone, a portable DAC, or a computer to a hi-fi amplifier requires converting a mini-jack output to a stereo RCA input. The Big Sur from AudioQuest fulfills this role with five meters of cable, a length sufficient for setups where the source is at a reasonable distance from the amplification system. This model sits at the top of the Bridges & Falls series, just below the Californian brand’s silver-technology cables.
PSC+ Copper and solid conductors
The Big Sur uses copper processed with the Perfect Surface Copper+ (PSC+) method, a more advanced version of the PSC used on the Golden Gate. AudioQuest applies a proprietary surface treatment designed to reduce microscopic roughness in the metal. These irregularities, even when invisible, can disrupt the flow of electrons and generate artifacts in the audio signal.
The conductors are solid-core, not stranded. This distinction matters: in a multi-strand cable, each strand can interact electrically and magnetically with its neighbors. These interactions create distortion phenomena that solid-core conductors avoid by design. The Big Sur fully exploits this principle along its entire five-meter length.
Geometry engineered for unbalanced signal
Most consumer RCA cables use a single conductor for both ground and shielding. The Big Sur separates these two functions thanks to its “asymmetrical double-balanced” geometry. The shielding captures radio and electromagnetic interference, while a dedicated conductor carries the signal return to ground. This separation reduces signal contamination by captured noise.
The ground-side impedance is intentionally lower than that of the signal path. AudioQuest claims this configuration improves perceived dynamics, particularly on fast transients and high-contrast passages.
Foamed polyethylene insulation
The insulation surrounding the conductors plays a role that is often underestimated. Any solid material in contact with copper absorbs part of the electrical energy, stores it, then releases it with a slight time delay. This phenomenon blurs micro-details and can give an impression of sonic “haze.”
The Big Sur uses foamed polyethylene (Foamed-PE), a material whose structure contains air bubbles. Air hardly absorbs any energy, and polyethylene exhibits a distortion profile considered benign by cable designers. This combination limits the energy storage-and-release effects that affect other, denser insulators.
Purple Copper terminations with gold plating
The Big Sur’s mini-jack and RCA plugs are made from “Purple Copper,” a high-purity copper that AudioQuest reserves for upper-tier models in its range. This metal replaces the nickel or standard OFHC used on more affordable cables. The plugs are then gold-plated to resist oxidation and maintain a stable electrical contact over time.
The connection between the conductor and the plug is made using cold-weld technology. This process applies intense mechanical and electrical pressure to fuse the metals without using an intermediate solder alloy. The absence of conventional solder (tin-lead or silver) eliminates a transition zone with electrical properties different from those of copper.
Noise dissipation system
Home environments are full of interference sources: Wi-Fi routers, phones, dimmer switches, household appliances. The Big Sur incorporates an NDS (Noise-Dissipation System) made up of metallic layers and carbon-loaded synthetic materials.
This multilayer shielding absorbs and reflects radio frequencies before they reach the audio equipment’s ground plane. Without this protection, captured interference can modulate the ground reference and introduce audible background noise, particularly bothersome with low-level sources such as smartphone headphone outputs.
A single jacket for both channels
Like all cables in the Bridges & Falls series, the Big Sur groups the left and right channels in a single brown-and-black braided jacket. This design makes the cable thin and flexible, easy to install behind furniture or along a baseboard. The trade-off with this configuration is that the RCA plugs are close to each other, spaced about 7 cm apart.
If the L and R inputs on your amplifier are more than 8 cm apart, installation is still possible but the cable will be under slight tension. For equipment with very widely spaced connectors, AudioQuest recommends its separate-jacket series (Rivers or Elements).
Typical use cases
The mini-jack to RCA format is suitable for many situations. Connecting a portable DAC like the FiiO M11 to a Sugden amplifier, plugging a MacBook’s headphone output into active speakers, or connecting a portable audio player to a desktop headphone amp: all these use cases make full use of the Big Sur’s features.
The cable also works in the opposite direction (RCA to mini-jack) if your setup requires it, but AudioQuest indicates the optimal direction with arrows printed on the jacket. This direction corresponds to the orientation of the shielding, designed to drain interference toward the source.
Technical specifications
Connectivity
- 1 male 3.5 mm mini-jack connector
- 2 male RCA connectors
Construction and materials
- Conductors: solid Perfect-Surface Copper+ (PSC+)
- Insulation: foamed polyethylene (nitrogen-injected PE)
- Geometry: asymmetrical double-balanced
- Terminations: cold-welded, gold-plated over pure purple copper
Noise-reduction technologies
- Noise-dissipation system: metal layer + carbon-loaded synthetics
- Effective reduction of RF and EMI interference
Technologies and performance
- PSC+ (Perfect-Surface Copper+) conductors: high-purity solid copper reducing distortion and optimizing signal transmission
- Metal-layer noise dissipation: effective reduction of RF and EMI interference for a cleaner signal
- Foamed polyethylene insulation: limits energy absorption and improves sound clarity
- Asymmetrical double-balanced geometry: separation of ground / shield for reduced background noise
- Gold-plated, cold-welded terminations: durable connections and low distortion at contact points
Compatibility
Compatible with most audio equipment featuring:
- 3.5 mm mini-jack output: smartphones, computers, portable players, DACs
- RCA inputs: amplifiers, AV receivers, powered speakers
Benefits
- High-fidelity analog signal transmission
- Effective reduction of RF and EMI interference
- Clearer, more natural and detailed sound
- Robust and durable construction
- Easy integration into any home audio system
Frequently Asked Questions
What’s the difference between the Big Sur and the Golden Gate?
The Big Sur uses PSC+ (Perfect Surface Copper+), a higher-grade copper than the standard PSC used in the Golden Gate. The terminations are also upgraded to gold-plated Purple Copper, instead of standard gold-plated connectors on the Golden Gate. These enhancements target better micro-detail resolution and further reduction of distortion.
Is the cable directional?
Yes. Arrows on the jacket indicate the recommended direction, from the source to the amplifier. This orientation optimizes RF interference drainage via the shielding. Plugging the cable in the opposite direction will not damage it, but may slightly increase background noise in electromagnetically noisy environments.
Can this cable be used with a headphone?
Not directly. The Big Sur is an interconnect cable between components, not a replacement headphone cable. It is used to connect a source (smartphone, DAC, computer) to a headphone amplifier or hi-fi amplifier equipped with RCA inputs.
Do the closely spaced RCA plugs cause problems with all amplifiers?
The spacing of about 7 cm between the two RCA plugs is suitable for the majority of integrated amplifiers and preamplifiers. Problems mainly arise with certain professional amplifiers or rack equipment where the L/R inputs are more than 8–10 cm apart.
Does the Big Sur improve sound compared to a cable supplied with a device?
Cables included with devices generally use standard-grade copper, basic shielding, and nickel connectors. The Big Sur offers higher-purity conductors, multilayer shielding, and gold-plated Purple Copper connectors. How noticeable these differences are depends on the overall quality of your system and your listening sensitivity.
- Eco-contribution included in the sale price.
- Manufacturer reference: 5.0M BIG SUR 3.5M-RCA
- GTIN / EAN: 92592063365