• At high frequencies
    low-quality cables can make
    even the best AV system
    look bad

Cable Fact on high frequencies

#5

Attenuation (the loss of signal) is an important parameter measuring signal strength. Less attenuation provides a stronger signal which results in a better performing, more robust network.

Investing in a top-notch Audio Visual system and saving on cabling is a classic example of being penny-wise and pound-foolish. But even when you take your cabling seriously, it is not that easy to pick the right cable. Inferior grade cables can often show a comparable AWG in their basic specification but record very different electrical results! Let's have an inside look!

What cable components are critical?

When it comes to high frequencies, the key component is:

  • The conductor – the core of the cable that transfers energy or signals from point to point.


The cross section of a cable conductor plays a crucial role in the cable design. This cross section is represented as an AWG measurement (American Wire Gauge). What makes it tricky is that there is a wide tolerance between the different AWG sizes. Inferior grade cables can often show a comparable AWG in their basic specification but report very different electrical results.

For example:

Cable Design 1

AWG 26
Cross section: 0.126 mm2
Attenuation 28.66 dB over 100 MT

Cable Design 2

AWG26
Cross section: 0.140 mm2
Attenuation 26.71 dB over 100 MT

The higher the size of the cross section, the higher the copper amount. Within the same AWG-size there is a possibility for lower attenuation (signal loss) and higher resistance.

  • Guaranteed cable performance
  • Maintained protection
  • Maximum safety
  • Reduced maintenance and replacement costs
  • Safety in any installation type
  • Reduced smoke emmissions

What is the threat of high frequencies?

  • The frequency being applied to a cable has a direct impact on the strength of the signal and the decrease in its magnitude as it travels from point to point.
  • At high frequencies the rate of electron absorption by the conductor increases, resulting in a loss in transmission of the signal strength ('attenuation').

What is the effect of high frequencies on sub-standard cable?

  • Cables unable to withstand high frequencies due to insufficient amounts of conductor material can result in sound and visual distortion and system incompetence.
  • High frequencies can have a detrimental impact on the performance of audio, video and Tannoy speaker systems, as less signal makes it to the display from the source.