Audioquest Tower RCA 20m

An analog interconnect cable named after London’s Tower Bridge: it is the first step in AudioQuest’s Bridges & Falls series, a range in which the American manufacturer concentrates most of its cabling technologies into a compact and affordable format. The Tower RCA uses the brand’s in-house recipe (solid long-grain copper conductor, low-loss insulation, noise-dissipation shielding) and offers it starting at 0.60 m, up to 20 m for long installations.

Solid LGC copper conductor: fewer grain boundaries, less distortion

Most entry-level cables use stranded OFHC (Oxygen-Free High-Conductivity) copper conductors. The Tower RCA takes a different approach: a solid, single-core LGC (Long-Grain Copper) conductor. The difference between the two lies in the metal’s crystal structure. LGC copper has longer grains, which reduces the number of crystal boundaries along the signal path. Each grain boundary acts like a micro-resistance that deforms the signal as it passes through. The fewer there are, the more faithful the transmission remains.

The single-core design also has a direct consequence. In a stranded conductor, adjacent strands interact with one another under the effect of electromagnetic fields, generating dynamic distortion (the signal is altered differently depending on its amplitude). A solid conductor eliminates this phenomenon. AudioQuest emphasizes one final point: the conductor’s surface quality acts as a guide for internal electric fields and external magnetic fields, hence the benefit of copper with low oxide and impurity content.

Foamed polyethylene insulation and its role in dynamics

Any insulating material placed near a conductor absorbs a fraction of the signal’s energy, then releases it with a slight time delay. This phenomenon blurs transients and reduces dynamic contrast. The Tower RCA uses foamed polyethylene (PE) insulation, a material whose high air content limits this absorption. Polyethylene is a low-loss dielectric with a low-distortion profile, making it well suited to transmitting sensitive analog signals.

Shielding and noise dissipation by metal layer

Achieving 100% shielding coverage is relatively simple. The real problem lies elsewhere: in traditional shielding, noise energy and radio-frequency interference (RFI) picked up by the shield are drained to the ground of the connected device. This stray energy then modulates the reference ground plane, causing distortion in the audio signal.

AudioQuest’s metal-layer Noise-Dissipation System (NDS) works differently. An interposed metal layer absorbs and reflects most of the noise energy before it reaches the layer connected to ground. The shield still performs its barrier function, but without contaminating the device’s ground reference. The practical result is a lower noise floor, noticeable in low-level passages.

Asymmetrical double-balanced geometry

Many unbalanced-termination (RCA) cables use a single path for ground and shielding. The Tower RCA separates these two functions thanks to a so-called asymmetrical double-balanced geometry, designed for unbalanced connections. This separation reduces impedance on the ground path, which promotes richer dynamic reproduction and a quieter background.

The Bridges & Falls series groups the left and right channels in a single jacket, with separate positive and negative conductors. This format produces a thin, flexible cable that is easy to install behind a cabinet or in a rack. One point to check before purchase: the left and right RCA plugs are close together (less than 7.6 cm apart). If your equipment’s inputs are spaced farther apart, AudioQuest recommends its Rivers or Elements series, whose plugs are independent.

Cold-weld terminations and gold-plated connectors

The Tower RCA’s RCA plugs are assembled by cold welding, a high-pressure process that eliminates any traditional solder. Tin solder, commonly used in connector assembly, introduces an additional alloy into the signal path, a potential source of distortion. The cold process avoids this added material.

The ground shells are stamped rather than machined. This manufacturing technique makes it possible to choose the metal for its acoustic properties (low distortion) rather than for its ease of machining. The gold plating protects the contacts against oxidation and ensures stable conductivity over time.

All internal conductors are direction-controlled (Direction-Controlled), a practice AudioQuest applies across its entire range to reduce residual RF noise.

Technical Specifications

Conductors

• Solid Long-Grain Copper (LGC)
  • Smoother and clearer sound than OFHC (high-conductivity oxygen-free) copper cables
  • Solid conductors prevent strand interaction, a major source of distortion
  • Fewer oxides in the conductor material
  • Fewer impurities
  • Fewer grain boundaries
  • Higher-quality surface serving as a guide rail for internal electric fields and external magnetic fields

Insulation

• Foamed Polyethylene (PE)
  • High air content greatly reduces the blur effect
  • Low energy absorption limits distortion caused by storage and release
  • Benign distortion profile and low losses

Shielding and noise dissipation

• Metal-layer noise dissipation
  • 100% shielding coverage
  • Absorbs and reflects most noise / RF energy before it reaches the grounded layer
  • Prevents captured radio-frequency interference (RFI) from modulating the equipment’s ground reference
  • Preserves the critical reference ground plane, unlike traditional systems that drain noise energy to the components’ ground

Geometry

• Asymmetrical double-balanced geometry
  • Specifically designed for single-ended applications
  • Relatively lower impedance on the ground, for richer and more dynamic reproduction
  • Separation of the ground path and the shield, for cleaner and quieter performance

Terminations

• Gold-plated cold-welded terminations
  • Solder-free connection, eliminating a common source of distortion
  • High-pressure assembly process
  • Stamped, not machined, ground shells, allowing the choice of a low-distortion metal rather than one optimized for machinability

Performance and benefits

• Enhanced audio experience: high-quality sound for a superior entertainment experience
• Clear signal transmission: minimizes interference and reduces distortion, for clean, clear, and naturally beautiful sound
• Premium materials and design: high-purity conductive metal, carefully selected insulation, and sophisticated shielding for minimal distortion
• Durable and reliable design, intended for everyday use and consistent performance

Connectivity and compatibility

• Connectivity: RCA to RCA
• Single-ended applications
• Compatible with TVs, soundbars, turntables, AV receivers, and other audio devices