QED (Quod Erat Demonstrandum) is a British brand that specializes in the manufacturing of high-quality audio and video cables. The company was founded in 1973 and has since become a well-respected name in the audio industry, particularly for its commitment to delivering reliable and high-performance cable solutions.

QED offers a wide range of cables designed for various audio and video applications, including:

  • Audio Cables: QED manufactures analog audio cables, including RCA interconnects, speaker cables, and 3.5mm cables, designed to transmit audio signals with accuracy and minimal interference.
  • Digital Audio Cables: The brand produces digital audio cables, such as coaxial and optical (Toslink) cables, for transmitting digital audio signals between audio devices.
  • Subwoofer Cables: QED offers subwoofer cables designed to carry low-frequency signals from AV receivers to subwoofers, enhancing the bass performance of audio systems.
  • HDMI Cables: The company manufactures 4K-8K HDMI cables for transmitting highdefinition audio and video signals between source devices and displays, such as TVs and projectors.
  • Speaker Cables: QED’s speaker cables are designed to provide a clear and stable connection between amplifiers or receivers and speakers, ensuring accurate sound reproduction.

QED is known for its use of high-quality materials and construction techniques in their cable designs, including advanced conductors, insulation, and shielding. Many of their cables feature gold-plated connectors to ensure optimal signal transfer and minimize signal loss.

The brand’s dedication to cable design and engineering has earned QED a loyal following among audio enthusiasts and home theater users who seek reliable and high-performance cable solutions without breaking the bank.