| 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. |
| 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).  |