User manual NAIM NAP 250

[. . . ] This is important for safety as well as performance. One end of each cable is marked with a band to establish its correct orientation. The band always marks the end that connects to the signal source. Loudspeaker leads are also very important. [. . . ] 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. 5. 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. Considerable shock hazard exists if the cut-off plug is inserted into a mains outlet. 5. 3 fuse carrier Should the plug fuse carrier be damaged or lost, the correct replacement must be obtained from your dealer, or from Naim Audio direct. Do not use the plug until the fuse carrier is replaced. 5. 4 plug fuses Replace only with ASTA or BS 1362 approved fuses. NOTE This equipment has been tested and found to comply with the relevant EMC and Safety Standards, and, where applicable, also complies with the limits for a class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning off and on, the user is encouraged to try to correct the interference by one or more of the following measures: · Reorient or relocate the receiving antenna. · Increase the separation between the equipment and the receiver. · Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. · Consult your Naim dealer or an experienced radio/TV technician for help. 3 NAP 500 6 Installation and Operation The NAP 500 and NA PS500 should be installed in their final operating locations before connecting cables or switching on. Switch on the source and preamplifier components, with the volume turned down, before switching on the NAP 500. YOUR LOUDSPEAKERS MAY BE AT RISK IF THIS IS THE CASE. THE VOLUME SHOULD BE REDUCED. 8. 3 loudspeaker cable and connectors Only Naim Audio speaker cable should be used to connect a loudspeaker to the output of the NAP 300. Custom Naim Audio loudspeaker connectors are supplied to make the connection. IN ORDER TO COMPLY WITH CURRENT EUROPEAN SAFETY REGULATIONS IT IS ESSENTIAL THAT THESE ARE USED. DAMAGE TO THE AMPLIFIER MAY RESULT IF "HIGH DEFINITION" CABLE OR ANY OTHER SPECIAL CABLE IS USED TO CONNECT THE LOUDSPEAKERS. 6 NAP 300 Connection & Specifications 9. 1 NAP 300 connection to NA PS300 Power Supply to preamp power supply. left, ch1 left speaker ch1 NA PS300 rear mains in Input Socket 1 Input Socket 2 ch1 -ve nc nc ch 2 -ve + 1 - + 2 right speaker ch2 to preamp power supply. right, ch2 9. 2 Specifications NAP 300 & NA PS300 Power Output Continuous, 8 ohms Transient Quiescent Power Consumption Voltage Gain Input Impedance Frequency response Mains Supply: Case size (H x W x D) NAP 300 NA PS300 Weight NAP 300 NA PS300 90 Watts per channel 500VA 27VA +29dB 18 kilohms -3dB @ 2Hz and 70kHz 100V. 230V - 50/60Hz 87 x 432 x 314mm 87 x 432 x 314mm 10. 7kg 14. 1kg 7 NAP 250 10 Installation and Operation The NAP 250 should be installed in its final operating location before connecting cables or switching on. Switch on the source and preamplifier components, with the volume turned down, before switching on the NAP 250. The NAP 250 power button is located on the front panel. The NAP 250 is very heavy and care should be taken when lifting or moving it. [. . . ] In order to avoid hum loops, the signal negative of the whole system should be connected to the mains earth (ground) in one place. This should be the primary signal source. 14. 2 protection notes If the amplifier's external case reaches 70°C due to prolonged running at high power, the mains supply will be interrupted and the illuminated logo will switch off until the amplifier has cooled down. OPERATION OF THE AMPLIFIER'S THERMAL PROTECTION SUGGESTS PROLONGED USE AT TOO HIGH A VOLUME LEVEL. YOUR LOUDSPEAKERS MAY BE AT RISK IF THIS IS THE CASE. [. . . ]