User manual NAD 911

[. . . ] Any mounting of the device on a wall or ceiling should follow the maufacturer's instructions and should use a mounting accessory recommended by the manufacturer. Quick stops, excessive force and uneven surfaces may cause the appliance and cart combination to overturn. Read and follow all the safety and operating instructions before connecting or using this unit. All warnings on the unit and in it's operating instructions should be adhered to. [. . . ] For mono sources use a single channel, for stereo sources use two adjacent channels. The level of the signal on this connector remains the same regardless of the front panel level controls. The level is suitable for driving standard hi-fi components and amplifiers and can be used with leads up to 1nF total capacitance. 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 higher 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. In most installations using the NAD-911, the hi-fi preamplifier is used to select the appropriate music source and for every-day adjustment of the music volume in the venue. Any hi-fi preamplifier can be used with the NAD911 or alternatively an integrated hi-fi amplifier can be used providing it has a `pre-amp' output. nAD supplies a range of preamplifiers and integrated amplifiers suitable for use with the NAD-911. Some installations will use a mixer instead of a preamp and this is connected and used with the NAD911 in exactly the same way as a preamplifier. The channel outputs of the NAD-911 will work with both hi-fi and professional power amplifiers. There is a range of NAD single channel, stereo or multi-channel power amplifiers that are suitable to work with the NAD-911. You should ensure that the power output level of the power amplifiers used in the installation matches the capabilities of the loudspeakers. If you are using a power amplifier with its own volume control, during installation set the NAD-911 LEVEL controls (3) to the 12 O'clock position and then adjust the power amplifier's volume control so that the sound level from the speaker is about right for normal use. The amplifiers can be placed near the NAD-911 using short signal leads and long speaker leads. Generally you will get better performance from the installation if the amplifiers are placed nearer the speakers using longer signal leads and shorter speaker leads. In either case to achieve best performance all speaker cables should be high quality large diameter speaker cables (16 gauge or more) and all signal leads should be high quality co-axial cable. Feeding the music signal to every channel in the distribution preamplifier is done by using links between the outputs of each channel to the inputs of the other channels. Using the short RCA leads supplied, connect the FIXED OUTPUT (5) of Channels 1 and 2 to the INPUT (4) of Channels 3 & 4. The NAD-911 is used primarily as an installation tool to distribute and accurately set up the sound levels in all parts of the venue. So in general daily operation, adjust the music source and overall level using the hi-fi preamplifier controls only. [. . . ] Configure the channels feeding the speakers in these areas to Insert Disabled to ensure that announcements are not accidentally routed to these areas. To set up the channel so that the channel level control alters the volume of both the music and insert levels. If you don't want the Insert signal to ever appear on a particular channel. Set the channel's first two jumpers (JP -01 and JP -02) to INS FIXED and set the second two jumpers (JP -03 and JP -04) to INS VARIABLE CAUTION: Do not use any other configuration of With the unit unplugged from the AC socket, remove the lid by removing the 5 screws securing the top panel. [. . . ]