Bose 1800-VI Gebruikershandleiding - Pagina 13

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4.8.3 Bridged mono

1800 SERIES VI PROFESSIONAL AMPLIFIER

FOR BRIDGED

OPERATIONS

SER.

CONSULT

NO.

MANUAL

OFF

BOSE CORPORATION, FRAMINGHAM, MA 01701-9168 MADE IN U.S.A.

LEVEL DEFEAT

INPUT IMPEDANCE 25K OHMS EACH LEG TO GROUND (TOTAL 50K OHMS BALANCED)

SEND

RECEIVE

PUSH

INPUT CH2

INPUT CH1

SEQUENCE

EQUALIZATION ON

CH1

CH2

CH1

EQ. OUT

Use CH 2

only for input

The stereo/mono switch is located on the input board behind slot #2 of the standard input

module (or, on the AMC-1 module, to the left along the rear edge of the board). For bridged-

mono operation, move the STEREO/MONO switch all the way to the right to the BRIDGED

setting (or, on the AMC-1 module, move that switch all the way to the left). Connect the

input signal to CH 2 input (CH 1 input becomes disabled). Connect the speakers to the two

+ speaker terminals. The CH 2 + terminal is the hot (non-inverting) side, and the CH 1 +

terminal is the low (–, inverting) side (see Figure 8).

When connected in this way, each channel "sees" half the impedance of the speaker

connected between them. If you use an 8 ohm speaker, each channel will see a 4 ohm load.

Therefore it is not recommended that you use any load lower than 8 ohms in this mode of

operation. Use parallel mono operation for lower impedances.

Note

Be sure to set both of the input level controls to the exact same setting for equal power

distribution per channel. Switching the level defeat switch (located on the amplifier) to OFF

will assure that both channels are operating at the same level.

4.8.4 Parallel mono

Parallel mono operation is useful when running sustained high levels in a single load or

when driving a low impedance load.

For instructions, contact Bose

4.9 Clipping eliminator

This circuit prevents the input signal from exceeding the point where it would drive the

amplifier into hard clipping. It has no effect until the signal reaches the clipping point. The

larger the input signal, the more it is reduced to keep the output just below clipping.

The clipping eliminator circuit is operational at the point of manufacture. However, you can

defeat it by using the clipping eliminator defeat switch. This switch is located on the rear

panel of the amplifier. Moving the switch up will re-engage the clipping eliminator.

Note

If you turn the input level down far enough, a sufficiently large input signal can drive the input

differential amplifier into clipping. The clipping eliminator circuit cannot remedy this. It also has

no effect on clipping that occurs prior to the amplifier inputs, such as at the mixer or equalizer.

WARNING

RISK OF HAZARDOUS ENERGY! MAKE PROPER

ENERGIE ELECTRIQUE DANGEREUSE.

SPEAKER CONNECTIONS. SEE OPERATING

D.O.M.

MANUAL BEFORE USING.

LICENSED UNDER U.S. PAT. NO. 4,484,150

CLIPPING

PUSH

ELIMINATOR

CAUTION

AVIS

OFF

RISK OF ELECTRIC SHOCK

RISQUE DE CHOC ELECTRIQUE

DO NOT OPEN

NE PAS OUVRIR

WARNING

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK

DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.

GND

or your authorized Bose Professional Products dealer.

BRIDGED

1400 W 8

700 W 4

200-240 V

50-60 Hz

1800 W

CH 2

CH 1

SPEAKER OUTPUTS

CLASS 1 WIRING SHALL BE USED

To "+"

To "–"

speaker

terminal

4.0 Installation

Figure 8

Bridged mono connection.

CAUTION

In bridged mono operation,

the output connections are

actually a balanced output

configuration. This means

both output terminals have

voltage present (neither may

be grounded).