AudioQuest Irish Red Subwoofer Cable
Connecting a subwoofer to its amplifier may seem trivial, until a low hum creeps into the bass or a long run alongside a power strip begins to interfere with the signal. AudioQuest’s subwoofer cable addresses this specific situation: carrying a mono LFE signal (the channel dedicated to low-frequency effects) over what is often a considerable distance, protected from the electrical interference lurking behind a TV cabinet.
The signal path, from core to insulation
Each conductor is a solid copper strand with 0.5% silver plating. The choice of solid-core construction is far from incidental: in a stranded cable, the signal jumps from one wire to another, and this interaction degrades performance. A single, continuous conductor prevents this. The silver plating promotes surface conduction, where the highest frequencies travel. On an LFE channel limited to bass, this refinement remains subtle; it comes fully into its own if you repurpose the cable for a conventional line-level connection, which its construction allows. The symmetrical coaxial geometry positions the positive and negative conductors identically, while keeping the shielding away from the audio path. The insulation is nitrogen-injected foamed polyethylene: the air it traps absorbs very little energy and limits the dielectric losses that blur the signal.
Keeping interference away from ground
Behind a TV cabinet, the subwoofer cable runs alongside power cords and power supplies, sources of radio-frequency and electromagnetic interference. Conventional shielding captures this interference and then drains it to the system ground, potentially contaminating this reference point that is supposed to remain stable. AudioQuest takes a different approach with its metal-layer noise-dissipation system: rather than sending everything to ground, it absorbs and reflects part of the unwanted energy before it reaches the ground plane of your equipment. The background becomes quieter, and the bass stands out more clearly.
Cold-welded, solder-free plugs
The RCA connectors are gold-plated and finished without a single solder joint. AudioQuest crimps the conductor under very high pressure, creating a mechanical contact known as cold welding. The benefit: it avoids solder tin, whose poor conductivity would sit in the signal path. The connection remains secure over time, and the plug fits firmly into both the subwoofer input and the amplifier’s subwoofer output.
The ground wire that eliminates hum
A powered subwoofer connected to an amplifier or AVR can sometimes produce ground hum, that deep, continuous buzz that reveals a ground loop. The cable includes a simple solution: two small terminals connected to a ground wire. If hum occurs, screw one terminal to the metal chassis of the subwoofer amplifier and the other to that of the source device, and the loop is properly closed. Most installations will not need it, but on the day the problem arises, the solution is already in the box.
Where the Irish Red sits in the range
AudioQuest offers its subwoofer cables in an animal-themed series, from the entry-level Black Lab to the more extensively equipped Boxer and Husky models. The Irish Red sits in the middle: it retains the geometry and shielding principle of the lower models, then raises the material standard with silver-plated conductors and a more refined exterior finish. The difference is measured less in flashy specifications than in manufacturing consistency.
Frequently asked questions
Can this cable be used as a conventional RCA connection outside of a subwoofer setup?
Yes. Its construction is that of a standard mono RCA cable, so nothing prevents it from being used between two devices for a line-level connection. This is even where its silver plating, beneficial for high frequencies, is most noticeable.
Is the ground wire mandatory?
No. Most systems operate without touching it. Only screw its terminals to the chassis of the subwoofer amplifier and source device if ground-loop hum is present.
Does the cable have a connection direction?
Yes, an arrow printed on the jacket indicates the orientation specified by the manufacturer. Connect it toward the subwoofer, on the signal-receiving side.
Is a silver-plated conductor useful for a bass signal?
For an LFE channel limited to low frequencies, shielding and grounding matter more than the conductor metal. Silver plating offers an advantage in full-range use, when high frequencies come into play.
Does it work with a soundbar or a home theater amplifier?
Yes, provided the device has an RCA-format subwoofer output and the subwoofer has an RCA or LFE input. Integrated amplifiers, AVRs and soundbars equipped with a subwoofer output are compatible.
Is it a mono or stereo cable?
It is a mono cable, with one RCA plug at each end, since the LFE signal in a home theater system is unique and already dedicated to bass.
