Audioquest Black Lab 20m

A subwoofer deserves a connection that lives up to what it can deliver. Too often neglected in favor of the main speakers, the cable that links the amplifier or processor to the subwoofer nonetheless plays a decisive role in bass reproduction. AudioQuest designed the Black Lab to address this issue with a coherent technical approach, from the conductor right through to the connector.

Copper engineered for low frequencies

The Black Lab uses a solid long-grain copper conductor, a crystalline structure that reduces the number of junctions between the metal’s grains. These junctions are as many microscopic obstacles to the passage of the signal, particularly critical in the low-frequency range, where the slightest discontinuity can result in a loss of definition. By reducing these friction points, LGC (Long Grain Copper) promotes a more direct transfer of audio information.

The chosen geometry is a symmetrical coaxial design: the positive and negative conductors have identical cross-sections, while the shielding remains physically separate from the signal path. This architecture allows the shield to fulfill its protective function without interfering with the transmission itself, helping to maintain a stable signal with low background noise.

Insulation designed for timing precision

Between the conductor and the outer jacket, insulation plays an often underestimated role. The Black Lab uses nitrogen-injected foamed polyethylene, a material whose high air content reduces the phenomenon of energy storage in the dielectric. In practice, this limits temporal smearing that can affect the attack and decay of bass notes, preserving the bite of a bass line or the impact of a cinematic effect.

Protection against interference and ground loops

Home cinema or hi-fi systems multiply potential sources of interference: Wi-Fi routers, dimmer switches, switching power supplies. The Black Lab incorporates a metal-layer noise dissipation system that combines absorption and reflection of radio-frequency (RF) and electromagnetic (EMI) disturbances. This protection also extends to ground loops, responsible for hums and buzzes that can pollute the signal, especially over cable runs of several meters between electronics and subwoofer.

The cable is well suited to setups where the subwoofer is located far from the amplifier: runs through walls, under carpets, or in conduits. The quality of the shielding helps maintain a clean signal over these distances without audible degradation.

RCA connectors and heat-free cold-weld assembly

The Black Lab’s RCA plugs feature gold plating that protects the contacts from oxidation over time. AudioQuest has opted for a high-pressure cold-weld assembly instead of traditional tin soldering. This method avoids exposing the conductors to high temperatures that could alter the copper structure and create additional points of resistance. The result is a mechanically solid and electrically reliable connection over the long term.

What the Black Lab brings to your listening experience

On a well-calibrated system, the Black Lab allows the subwoofer to operate in better conditions: tighter, more defined bass, improved integration between the subwoofer and the main speakers, and the absence of interference that clarifies the entire spectrum. In home cinema, this signal cleanliness also translates into better dialogue intelligibility, as the sub no longer masks or disrupts midrange frequencies.

Technical specifications

General information

• Cable type: Mono RCA for subwoofer (LFE / Subwoofer)
• Function: transmission of low-frequency signal between a source device and an active subwoofer
• Compatibility: amplifiers, AV receivers, soundbars, home cinema processors

Connectors and connection

• Connectors: gold-plated RCA
• Connection method: cold-welded under high pressure
  • Connection without thermal degradation
  • High resistance to oxidation
• Installation: suitable for in-wall installation and long-distance use without signal loss

Conductors and structure

• Conductor material: solid long-grain copper (LGC, Long Grain Copper)
  • Reduced distortion
  • Better transmission of low frequencies
• Structure: symmetrical coaxial geometry
  • Positive and negative conductors with identical cross-section
  • Shielding independent from the audio signal
  • More stable signal with low distortion and less noise

Insulation and shielding

• Insulation: nitrogen-injected foamed polyethylene
  • High air content
  • Reduced energy storage and sonic smearing
  • Better time-domain accuracy
• Shielding: metal-layer noise-dissipation system
  • Absorption and reflection of radio-frequency (RF) interference
  • Protection against electromagnetic interference (EMI)
  • Elimination of ground loops
  • Protection of the ground from electrical pollution
  • Suppression of hum and noise

Audio performance

• Deeper, tight, and controlled bass
• Excellent low-frequency dynamics
• No hum or ground noise
• Very high immunity to interference
• Increased clarity of dialogue and sound effects
• Clean signal even over long distances