Single core lapped screen cables like
XR15R or XR12N provide a good degree of protection in budget
conscious and speech quality equipment, and will carry a single
channel or mono signal across short runs very effectively.
Mono connections in high quality audio circuits require a better
cable, with thicker central conductors for lower resistance,
and much more substantial woven screen layers surrounding them.
These high grade cables (XS24B, XS38R and FN74R) have much lower
capacitance between inner conductor and outer screen, which
means that the high frequency crispness of a signal is much
better preserved, as well as providing a very high degree of
screening of unwanted external signals. They are also much more
rugged than the thinner lapped core cables and much harder wearing
in use.
If only the best is good enough, you may choose to use XS56L,
a cable with a pure silver central conductor for the minimum
of resistance and a silver plated screen layer for excellent
protection from hum and other interference. The cable to core
capacitance of this cable is also exceptionally low, meaning
that your signal will be connected between equipment with total
clarity. Note that you must use special silver solder (DP52G)
to connect this cable at each end. The choice for stereo connections,
especially where quality and preservation of the original signal
is important, is a little more confusing at first glance
In addition to the signal carrying capabilities of the cable,
it may be necessary to consider crosstalk, where signal from
one channel bleeds over to the adjacent core, reducing channel
separation. |
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The use of two cables would obviously
reduce this to a minimum, but this is usually a rather inelegant
solution and leads to twisted or bunched cable runs. As with
the mono cables, there is an entry level lap screened twin figure
of eight cable (XR21X) that is ideal for cost conscious projects
and non critical circuits.
There are also some twin overall lapped screen cables (XR20W
and XS23A) for applications where crosstalk is not important,
with a compact oval profile.
For high fidelity stereo use, XS93B is a good choice, although
discerning listeners may prefer to use the double screened Oxygen
free copper braided pair XS39N. Again, there is a silver alternative
(EL13P) for those for whom clarity and perfect signal transfer
is the ultimate priority.
In the latest Maplin catalogue, you will also find specialised
screened audio cables for microphones (XR90X, XR08J, XR98G,
ETC), where flexibility, colour coding and provision for the
special conditions for professional balanced microphones are
catered for, as well as some four way screened cables for multi-channel
applications (XR92A and XS95D).
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