User manual NAD C 275BEE

[. . . ] ® Owner’s Manual Stereo Power Amplifier C 275BEE РУССКИЙ SVENSKA NEDERLANDS DEUTSCH ITALIANO ESPAÑOL FRANÇAIS ENGLISH IMPORTANT SAFETY INSTRUCTIONS ENGLISH FRANÇAIS ESPAÑOL ITALIANO DEUTSCH NEDERLANDS SVENSKA РУССКИЙ Save these instructions for later use. Follow all warnings and instructions marked on the audio equipment. 1 Read instructions - All the safety and operating instructions should be read before the product is operated. 2 Retain instructions - The safety and operating instructions should be retained for future reference. [. . . ] 4 SOFT CLIPPING INDICATOR: The blue SOFT CLIPPING LED shows that the SOFT CLIPPING mode is engaged. Refer also to the item below about SOFT CLIPPING at the IDENTIFICATION OF CONTROLS – REAR PANEL. 1 2 3 4 ITALIANO DEUTSCH NEDERLANDS SVENSKA РУССКИЙ In cases of serious abuse of the C 275BEE, such as excessively low loudspeaker impedance and short circuit, the C 275BEE will engage its Protection circuitry, indicated by the Standby LED turning from blue to red and the sound being muted. In such a case, turn the C 275BEE OFF by the rear panel POWER switch, wait for it to cool down and/or check the speaker connections, making sure the overall loudspeaker impedance doesn’t go below 4 ohms or 8 ohms in Bridge mode. Once the cause for the protection circuitry to engage has been removed, switch ON the rear POWER button and the Standby Button to resume normal operation.  IDENTIFICATION OF CONTROLS REAR PANEL 9 10 11 1 2 3 4 5 6 7 8 ATTENTION! Please make sure that the C 275BEE is powered OFF or unplugged before making any connections. It is also advisable to power-down or unplug all associated components while making or breaking any signal or AC power connections. 1 INPUT SELECT: Slide this switch to either “FIX” or “VAR”. When it is set to FIX, the input signal is taken straight to the power amplifier’s circuitry. This setting is normally used in a system with only one power amplifier or multiple but identical power amplifiers. When the INPUT SELECT switch is set to “VAR” (Variable), it is possible to adjust the volume level for both channels simultaneously, using the INPUT LEVEL CONTROL. This can be useful for: Level Matching In a surround sound or system with more than one set of speakers, differences in levels can occur due to variance inefficiencies between these speakers. In case your preamplifier or processor also has individual trims for each channel, set these to neutral or mid position (usually marked as 0dB). Adjust the INPUT LEVEL CONTROL so that the speakers driven by the C 275BEE have the correct volume level compared to the other speakers, judging from your listening position. Extended Volume Control Range Many systems have so much voltage gain that the speakers (or your ears) are overdriven at any volume control setting higher than 11 or 12 o’clock. As a result you are confined to using only the lower half of the volume control’s range, where adjustments are imprecise and where channel balance errors tend to be greater. If the input level is reduced, you can turn up the volume control of your processor or preamplifier, making more effective use of its range. (Suggestion: adjust the input level controls so that your preferred maximum sound levels usually occur at about 2 or 3 o’clock on the volume control. ) As an added benefit, this procedure suppresses any noise produced by the preamplifier’s high level circuitry (e. g. any residual hum or hiss that does not go away when the Volume is turned down). Bi-Amping Some loudspeakers have separate connection terminals for their LF (Low Frequency) and HF (High Frequency) sections. Where a separate power amplifier is used for the LF and HF section, this facility allows to “Bi-Amp” such speakers which may improve overall sound quality. When Bi-Amping with different models of power amplifiers, it is likely to occur that one power amplifier has more “gain” than the other, resulting in a mismatch in level for the woofer and tweeter of the speaker. Adjust the level control so that woofer and tweeter are in perfect balance with each other (identical gain of power amplifiers). [. . . ] • +12V TRIGGER IN/INPUT SENSE switch set to “AUTO” position. • Power AC lead unplugged or power not switched ON. POSSIBLE SOLUTIONS • Plug the power cord into the wall outlet securely. • Set the POWER switch to ON position. [. . . ]