User manual NAIM NAC 32-5

[. . . ] Susceptibility to radio frequency interference is related to the wide internal bandwidth necessary for high sound quality. 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. 2 General Installation naim equipment is designed to offer the finest performance possible avoiding compromise wherever practical. This can lead to circumstances that may be unfamiliar. [. . . ] Please establish the local guarantee arrangements with your retailer. Contact Naim Audio directly for help and advice if necessary. 2. 2 s witc h i n g o n Source components and power supplies should be switched on before the power amplifiers. Always switch amplifiers off and wait a minute before connecting or disconnecting any leads. Always use the power switch on the product rather than a mains outlet switch. A "thump" may be heard from the loudspeakers as power amplifiers are switched on. This is normal, will not cause any loudspeaker damage and does not point to any fault or problem. A mild "pop" may also be heard shortly after equipment is switched off. I n t ro duction 2. 7 s ervi c e a n d u p d a t e s It is essential that repairs and updates are only carried out by an authorised Naim retailer or at the factory by Naim itself. Many components are custom made, tested or matched and appropriate replacements are often unobtainable from other sources. Direct contact to Naim for service or update information should be made initially through Customer Services: Tel: Email: +44 (0)1722 426600 info@naim-uk. com Please quote the product serial number (found on its rear panel) in all correspondence. N A C 122x 3 Installation and operation The naC 122x preamplifier does not incorporate an internal power supply but must be used in conjunction with either a naim power amplifier incorporating a preamplifier power output, or with an appropriate naim power supply. Diagram 4. 3 illustrates the naC 122x connected to a Flatcap 2x power supply. 3. 1 Input s o c k e t s The input selector buttons select the source input signal to be routed to the preamplifier outputs and the power amplifier. The NAC 122x has six DIN input sockets and two alternative pairs of RCA Phono sockets. Unity gain only becomes operational on exiting from program mode by pressing and holding the handset prog key. N A C 122x note: The unity gain feature must be used with care. It effectively by-passes the NAC 122x volume control leaving any signal connected to a unity gain input to be passed to the power amplifier and speakers at full volume. Additionally, if the AV input is selected while unity gain is enabled the handset volume function will be disabled and the preamplifier's volume indicator will turn off. This will be flagged by the indicator flashing if the handset volume function is operated. Record mute can be engaged and disengaged from the remote handset by operating the record monitor function followed by the mute function. 3. 9 Display The NAC 122x front panel button display can be switched off by pressing the remote handset (in preamplifier mode) disp function. Any subsequent handset or front panel operation will temporarily restore the display. A second operation of the disp function will permanently restore the display. 3. 5 Hand s e t V o l u m e C o n t r o l The remote handset volume function provides some alternative control characteristics. A quick press and release of the key will adjust by a preset "nudge". A quick press and release of the key followed by press and hold will cause continual slow adjustment. Simple press and hold will cause continual fast adjustment. 3. 10 switch-on After switch-on, via the power supply or power amplifier power button, the NAC 122x will remain muted for 30 seconds while control systems and circuits stabilise. 3. 6 mute The mute button silences and restores the output signal. 3. 11 remote control The NARCOM remote handset supplied with the NAC 122x duplicates all configuration and control functions. The NAC 122x also provides remote control input that enables it to be integrated with remote handset (RC5) signal repeaters. [. . . ] note: The RS232/comms interface is an optional note: The NAC 122x features various technologies to reduce microphonic effects. Some movement of the board and sockets when connecting and disconnecting cables is normal. upgrade. It can be specified at time of order or fitted retrospectively. Contact your local representative or Naim Audio directly for further information. 4. 3 naC 1 2 2 x C o n n e c t e d t o F l a t c a p 2 x P o w e r s u p p l y 240° 5 to 5 pin DIN power switch mains input and fuse to stereo power amplifiers to mono or dual mono power amplifiers for CD5x , Headline or Stageline. [. . . ]