SVS SoundPath Subwoofer 12m

Placing a subwoofer away from the amplifier means running several metres of RCA cable across the room. Over this distance, insufficient shielding allows hum and interference through, muddying the bass. The 12-metre version of the subwoofer cable SVS SoundPath is designed precisely for this situation: connecting a source and a distant subwoofer while keeping the signal clean from end to end.

OFC copper and five insulation layers

The signal travels down to the subwoofer through two conductors insulated from one another, each made of fourteen strands of 99.99% purified oxygen-free copper (OFC). Around them, the insulation is arranged in five layers. The first is a 1.6 mm high-density polyethylene (HDPE) jacket that wraps each conductor separately and limits interactions between the two. Next comes a 7 mm high-density PVC dielectric forming the cable’s backbone, followed by a PET (Mylar) foil that holds and protects the internal structure. The shielding forms the penultimate layer, detailed below, while a braided cotton jacket encloses the whole assembly, providing both mechanical protection and finishing. The outer diameter remains a compact 7 mm, slim enough to run along a skirting board or beneath a rug.

Shielding connected at the source end

Over twelve metres, the shielding does most of the work. It combines aluminium foil and a braid of 56 tinned OFC copper strands, spirally wrapped around the internal structure. Its purpose is to block electromagnetic and radio-frequency interference (EMI and RFI), which a long cable picks up all the more easily as it runs through a room filled with electrical devices.

A special feature of this shielding is that it is grounded on one side only, at the source end. This asymmetric connection prevents a loop from forming between the two devices through the shielding itself, a classic cause of hum. It also gives the cable a direction: one end is intended for the source, amplifier or processor, and the other for the subwoofer.

Machined, gold-plated RCA plugs

The plugs reflect the care devoted to the cable. Their shells are machined from anodised aircraft-grade aluminium, with red and white identification rings to distinguish the ends and channels at a glance. The centre pin and outer ring are made of 24-carat gold-plated brass, a coating that resists corrosion and maintains stable contact over time. The ground body is slotted, ensuring a firm grip on the RCA socket of both the subwoofer and amplifier.

The solder joints use a high-quality lead-free alloy. This matters for a bass connection, where deteriorating contact eventually becomes audible as crackling or dropouts.

Bandwidth far beyond bass requirements

The published measurements provide a precise picture of the cable. DC resistance is 77 milliohms per metre for the conductors and 30 milliohms per metre for the shielding. Nominal capacitance remains low, at 39 picofarads per metre at 1 kHz. Nominal impedance is 110 ohms, with cable and plugs matched to reduce standing wave ratio and reflection losses. On a 3-metre cable, the stated bandwidth runs from DC up to 5 megahertz, with a standing wave ratio of less than or equal to 1.09 and a return loss of at least 27 decibels.

These values belong to the vocabulary of radio frequencies. Yet a subwoofer signal operates between roughly twenty and two hundred hertz, far below the measured megahertz range: the bandwidth and impedance matching greatly exceed what bass requires. At subwoofer scale, the benefit lies in the low capacitance and low conductor resistance, which preserve signal level and definition over long distances, and above all in the quality of the shielding. The radio-frequency figures primarily demonstrate the seriousness of the construction.

Running twelve metres neatly

The cable is available from 1 to 15 metres, and this model sits at the second-highest length. Twelve metres covers situations where the subwoofer is clearly distant from the electronics: the opposite corner of the living room, placement behind the seating, or a dual-subwoofer installation where one unit is far from the equipment rack.

Choosing a length as close as possible to the actual distance, with a little slack for corners, avoids accumulating excess cable. The slim 7 mm profile and flexible cotton jacket make it easy to route along walls. For long-term peace of mind, SVS covers the cable with a five-year warranty and offers the option to try it at home for 45 days.

Technical Specifications

Structure and Materials

• Outer sheath braided in premium cotton, aesthetic and durable
• Dielectric layers:
  • High-density polyvinyl chloride (PVC) of 7 mm
  • High-density polyethylene (HDPE) of 1.6 mm surrounding each conductor
• Shielding:
  • Polyethylene terephthalate (PET Mylar) foil
  • Aluminum and oxygen-free copper (OFC) tinned braid, grounded on the source side
• Connectors:
  • Precision soldering with high-quality lead-free alloy
  • Conductive pin in 24-carat gold-plated brass

Electrical Specifications

• Conductor resistance (DCR): 77 mΩ / meter
• Shielding resistance (DCR): 30 mΩ / meter
• Nominal impedance: 110 Ω (cable and RCA connectors compatible)
• Nominal capacitance: 39 pF / m at 1 kHz
• Nominal bandwidth: DC - 5 MHz (3 m cable)
  • Standing wave ratio (SWR) ≤ 1.09
  • Return loss ≥ 27 dB

Dimensions

• Nominal outer diameter: 7 mm