The 52.5' Irish Red Subwoofer Cable from AudioQuest has an RCA connector on each side and features solid 0.5% silver-plated conductors.
Solid 0.5% Silver Conductors
Solid silver-plated conductors eliminate strand-interaction distortion and reduce jitter. They are made for very high-frequency applications which travel almost exclusively on the surface of the conductor.
Irish Red uses air-filled foamed-polyethylene insulation on both conductors which minimizes distortion.
Metal-Layer Noise-Dissipation System (NDS)
The Noise-Dissipation System prevents a significant amount of RFI from reaching the equipment's ground plane.
Symmetrical Coax Geometry
Identical positive and negative conductors prevent the shield being used as an inferior audio conductor.
Cold-Welded Gold-Plated Plugs
This plug design allows for a connection devoid of solder. The ground shells are stamped instead of machined so the metal can be chosen for low distortion instead of machinability.
To avoid hum, you can attach the little spade-lug tails to the metal chassis of the subwoofer amplifier and to the chassis of the sending component.