AudioQuest Columbia RCA, 4m DBS with FREE SHIPPING

Original owner in excellent condition. The Dielectric Bias System is 48V and the batteries are still good. These have been my primary preamp-amp interconnects for years. My configuration has changed and I no longer need these long interconnects.

Age is rated "Very Good" only because they are 6-7 years old and the battery life is probably not infinite. Note the cable doesn't actually draw current from the batteries (unless you press the 'check battery button' to light the LED) so their life should be quite long. Otherwise they were not moved around so are in excellent shape.

Paraphrased from Crutchfield:
These AudioQuest Columbia are 4m RCA terminated cables with a 48-volt DBS pack which aligns the molecules in the dielectric, and enhances performance.

The “Triple-Balanced Design” has three identical insulated conductors. The shield is never used as an inferior conductor. Two conductors are used together for the much higher potential across the negative connection, providing a substantial performance advantage. The shield is only attached at one end, providing total shield coverage without compromising the negative conducting path. Because the shield is only connected at one end the cable is directional and is marked which end is the source.

The Columbia use two 21-gauge and one 20-gauge solid conductors instead of stranded conductors. Electrical and magnetic interaction between strands in conventional cables are the greatest source of distortion, often causing a somewhat dirty harsh sound. Solid conductors produce less distortion, thus produce a very clean sound.

The metal for the signal path is AudioQuest’s “Perfect-Surface Copper+” (PSC+) has a very smooth and pure surface. AudioQuest's proprietary metal processing technology protects the wire's surface at every stage of drawing and fabrication. An ultra pure copper is kept soft, pure, and smooth as possible during the manufacturing process, resulting in a very low distortion PSC+ conductor. The resulting sound is more focused.

The Columbia's insulation uses Polyethylene Air Tubes. Air absorbs virtually no energy (which could be stored and released as distortion), and Polyethylene is a low-loss material that causes very little interference or distortion. The conductors and drainwire are wrapped in a PVC jacket with a black, green and gray nylon braid on the outside.
The Dielectric-Bias System (DBS) uses an attached 48-volt Dielectric Bias System (DBS) pack to enhance performance. All insulation slows down the signal on the conductor inside, and when the insulation is unbiased, it slows down parts of the signal differently. This creates problems with time-sensitive, multi-octave audio. The DBS creates a strong, stable electrostatic field which saturates and polarizes the molecules of the insulation. This minimizes energy storage in the insulation and the multiple non-linear time-delays. The audio has more detail and dynamic contrast. A test button and LED allow you to occasionally verify battery performance.

The “Noise-Dissipation System” used in the Columbia has a metal and carbon-loaded synthetic shield with 100% coverage to capture RF interference that could modulate the equipment's ground reference. The RF is dissipated through a 22-gauge solid, silver-plated copper drainwire.

The RCA Plugs are ‘cold welded’ which enables a perfect heat-free connection between the cable and the plug.