NAD NAD 911 DISTRIBUTION PREAMPLIFIER, REAR PANEL CONNECTIONS 1.MIC IN, Important Information

GB NAD 911 DISTRIBUTION PREAMPLIFIER

INTRODUCTION TO THE NAD-911 DIS- TRIBUTION PREAMPLIFIER.

The NAD-911 Distribution Preamplifier has been designed to control sound in multi-room or multi- speaker installations where both music and messag- ing is required. It will take mono or stereo signals from a mixer or hi-fi preamplifier and control the distri- bution of sound in up to six separately controllable speaker zones. Each level control will alter the vol- ume of one particular speaker zone so that the sys- tem can deliver music at different levels in different areas of the installation. With the built-in microphone section, the NAD-911 can selectively deliver announcements and messages to individual parts of the system.

Several NAD-911s can be connected together to control music and messages in larger installations. With a range of internal configuration presets, the NAD-911 has the flexibility to be configured to match the needs of most setups.

This manual outlines the use of the NAD-911 in the most common types of installation. The unit can also be configured for a wide range of specialist setups and a qualified installation engineer will be able to advise on connecting and configuring the NAD-911 within more complex installations.

REAR PANEL CONNECTIONS.

1.MIC IN

Input for a Microphone. This Input is suitable for most medium to high impedance microphones.

The microphone circuitry has a bass roll-off filter that will reduce low frequency microphone handling noises being passed to the speakers. A limiter has been added to the microphone circuit to reduce over- load distortion on very loud sounds. The Microphone is selected by using the front panel MASTER INSERT button (6) together with the individual channel INSERT buttons (4) and adjusting MICROPHONE LEVEL control (5). Plugging in a microphone into this socket automatically switches off the LINE INSERT IN connector.

2.LINE INSERT IN

Input for a line level source. This is used as an alternative to the microphone for message sources such as pre-recorded announcements. This is only active when MIC IN is unused. The MIC IN and LINE INSERT IN signal can be at a fixed or variable level depending on the settings of the internal configuration presets.

IMPORTANT INFORMATION.

The NAD- 911 should be placed on a firm level sur- face. Dampness can damage electronic components, so the unit should not be placed in areas of high humidity or where liquid could be splashed on it or spilt over it.

If liquid is spilt over the unit then disconnect from the AC socket and have the unit inspected by quali- fied service personnel before attempting to use it again.

The NAD-911 uses standard RCA and 1/4” jack connections and it is recommended that you use high quality connectors and cables throughout the installa- tion as this will improve the reliability and the overall performance of the system.

If the unit is not going to be used for some time, disconnect the power plug from the AC socket.

There are installation presets inside the unit and these should be adjusted by qualified installation per- sonnel only. Ensure the top cover is securely replaced before using your NAD Distribution Preamplifier.

3.MIC LINE OUT

Direct output for the microphone signal. The NAD- 911 amplifies the microphone input to line level so it can be used as the microphone feed to additional NAD-911s in a larger installation. The output of this socket can be at a fixed or variable level depending on the settings of the internal configuration presets.

4.INPUT (CHANNELS 1 -6)

Line level inputs for each of the six channels. These can be connected to any type of audio system such as a hi-fi preamplifier, cassette deck, CD player, mixer or the audio outputs of a video player. For mono sources use a single channel, for stereo sources use two adjacent channels.

5.FIXED OUT (CHANNELS 1-6)

Direct output for each channel. The level of the signal on this connector remains the same regardless of the front panel level controls. The INSERT signal does not appear on the FIXED OUT connections. The level is suitable for driving standard hi-fi components and amplifiers and can be used with leads up to 1nF total capacitance.

CLEANING.

Use a soft cloth to clean the NAD-911. If neces- sary, lightly dampen the cloth with soapy water. Do not use solutions containing benzol or other volatile agents.

6.VARIABLE OUT (CHANNELS 1-6)

Direct output for each channel. The level of the signal on this connector is altered by the front panel LEVEL controls (5). The INSERT signal will appear mixed on the VARIABLE OUT connections when selected by pressing the INSERT buttons. At its high- er settings of the LEVEL control, this output will drive professional (20dBu/600ohm) amplifiers. The variable output has a low impedance so it can be used to drive long cable runs up to 22nF total capacitance.

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7.POWER CABLE

Fixed power AC cord for connection to AC socket.