Bose 1800-VI Owner's Manual - Page 17

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5.0 Operation

5.4.4 EQ OUT connectors

A 1/4" TRS output connector provides access to an equalized line level output signal for

each channel. If equalizer cards are installed, this signal has passed through the internal

equalizer, but has not passed through the amplifier itself. (For additional information on

equalization cards, see Input Modules on page 14.)

This is helpful if several devices are going to be driving similar Bose

loudspeakers (802

loudspeakers, for example) with the same source signal. With equalization cards installed in

the Model 1800-VI or 1600-VI amplifier, the EQ OUT of the amplifier can be connected to

the line level inputs of additional devices driving the same type Bose loudspeakers (i.e. 802).

The type of equalizer cards used must correspond to the type of loudspeakers.

5.4.5 Equalizer LEDs

You can install equalizer cards on the motherboard of the input module by removing the

input module. When you install an equalizer card, the corresponding LED illuminates to

indicate the presence of the card.

Each channel can utilize a different card. For example, the Bose Model 1800-VI Professional

Stereo Power Amplifier can have both a 402

and a 502

B equalizer card installed. When

you install a 502B card in either card position, it automatically selects the high frequency

output of the other card. When a system uses two or more amplifiers, and you are using a

502B module, use the EQ Bi-Amp/Full Range switch to run in the bi-amp mode.

Note

When equalizer cards are installed, the input module automatically senses the cards and

switches to the equalizer circuitry. If no cards are installed, the input module bypasses the

equalizer circuitry.

5.4.6 EQ Bi-Amp/Full Range switch

This switch is located on the motherboard of the input module. The module must be

removed to access this switch. To select the high frequency output from both equalizer

cards, engage this switch (HF ONLY position). The high pass filter begins reducing the

signal below 140 Hz and allows the same equalizer card to be used for full range output

and bi-amp output. This feature is useful when using two or more amplifiers and a 502B

module.

5.4.7 Level defeat switch

This switch is located above the input module and defeats the CHANNEL 1 and CHANNEL 2

LEVEL controls. When the controls are defeated (switch moved to the left) the amplifier gain

is set at the maximum level. The module must be removed to access this switch.

5.4.8 Sequencer connector

This feature is helpful if you are using many amplifiers since it allows amplifiers to sequen-

tially power up. This reduces the initial surge currents from the AC power source to avoid

tripping circuit breakers. The SEND connector of one amplifier is connected to the RECEIVE

connector of the next amplifier. Turn the master power off by switching the equipment rack,

circuit breaker or other main power switch off. The first amplifier in the chain should be in

the normal on position. The subsequent amplifiers should be in the standby mode. When

the master power is turned on, the amplifiers will sequentially power up. For additional

information on switch settings, see Section 5.3.1.