User manual NAIM POWERAMPS

[. . . ] An exception to these loudspeaker cable constraints is the nap 6-50 multi-room power amplifier. The nap 6-50 is designed to be tolerant of both a wide variety of cable types, and cable runs well in excess of 20m. The loudspeaker connectors supplied with all Naim amplifiers and loudspeakers have been specifically designed to make a robust mechanical connection. It is essential that these are used in order to comply with current European safety regulations. [. . . ] The material that follows contains advice specifically related to Naim equipment as well as more general warnings about the use of domestic audio products. The transformers in Naim power amplifiers and power supplies may sometimes make a mechanical noise caused by distortion of the mains waveform. Naim transformers are large in size and have heavy gauge secondary windings making them relatively sensitive to such distortion. A separate mains circuit for your hi-fi system may reduce the effect while also giving an overall improvement in sound quality. It may be necessary however to take account of mechanical transformer noise when siting your equipment. In some circumstances, depending on where you live and the earthing arrangements in your home, you may experience radio frequency interference. Controls on broadcasting in some territories allow very high levels of radio frequency radiation and both the choice and exact siting of equipment may be critical. If there is a known problem in your locality it is advisable to arrange for a home demonstration before purchase to find out if Naim equipment is likely to be affected. Susceptibility to radio frequency interference is related to the wide internal bandwidth necessary for high sound quality. Systems incorporating moving coil phono preamplifiers and active crossovers are more likely to suffer. A radio frequency filter kit is available for some Naim equipment but sound quality will be progressively compromised as more elements of the kit are fitted. In situations of extreme radio interference Naim equipment may be unsuitable. Your Naim hi-fi system can be damaged by lightning. Power amplifiers are particularly at risk and should be turned off when there is risk of lightning strike. For complete protection all mains plugs and any aerial cables should be disconnected when not in use. Equipment must not be exposed to dripping or splashing and no objects filled with liquid, such as vases, should be placed on the equipment. important In order to comply with current European safety regulations it is essential that the Naim loudspeaker connectors supplied with amplifiers and loudspeakers are used. Do not under any circumstances allow anyone to modify your Naim equipment without first checking with the factory, your dealer, or your distributor. Unauthorised modifications will invalidate your guarantee. For your own safety do not under any circumstances open Naim equipment without first disconnecting the mains. The following label is attached to all mains powered equipment: 3 4. 0 Connection 4. 1 mains lead As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured markings identifying the terminals in your plug proceed as follows: The wire which is coloured GREEN-AND-YELLOW must be connected to the terminal in the plug which is marked by the letter E or by the safety earth symbol or coloured green or green-and-yellow. The wire which is coloured BLUE must be connected to the terminal in the plug which is marked with the letter N or coloured black. The wire which is coloured BROWN must be connected to the terminal in the plug which is marked with the letter L or coloured red. 4. 2 non-rewireable mains plugs If a non-rewireable plug is cut from a mains lead (for whatever purpose) the plug MUST be disposed of in a way to render it totally unusable. [. . . ] The regulated power suppplies in the nap 250 will shut down if more than 17 amps is drawn for more than 10 microseconds but the indicator light will not go off. To reset, turn the amplifier off for one minute. loudspeaker cable For the best results Naim Audio's own speaker cable should be used to connect a loudspeaker to the output of the power amplifiers. Special Naim Audio loudspeaker connectors are supplied to make the connection to the power amplifier(s). IT IS ESSENTIAL THAT THESE ARE USED, IN ORDER TO COMPLY WITH CURRENT SAFETY REGULATIONS. [. . . ]