Manual Samson SX1800 (page 11 of 60) (English, German, French, Italian, Spanish)

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Bridge and Parallel Modes

The SX Series provides a rear-panel switch that allows it to be used in either a Bridge

or Parallel mode. When this switch is placed in the “STEREO” (center) position, the SX

Series functions as a true stereo amplifier, where both of the two independent ampli

fier channels (Channel 1 and Channel 2) can receive different input signals and pro

duce independent output signals. However, when the switch is placed in the “Bridge”

(left) position, the Channel 1 inputs signal is routed to both power amplifiers bridged

together, producing a single output signal with 900 watts for the SX1200, 1200 watts

for the SX1800, 1500 watts for the SX2400, 1800 watts for the SX2800 and a massive

2200 watts for the SX3200 into 8 ohms load.

The illustration on the right shows how this works. In Bridge mode, the polarity

(phase) of the Channel 2 output signal is reversed relative to that of the Channel 1 out

put signal. Both channels then process the same input signal, with the speaker load

connected so that power is derived from both channels. The effective voltage swing

seen by the load is thus doubled, so that the power output is multiplied by more four.

When using the SX Series in Bridge mode, be sure to connect your loudspeaker as

shown in the illustrations on page 9 (and as silkscreened on the rear panel), with the

red (+) terminal of the Channel 1 output connected to the positive input of the speak

er and the red (+) terminal of the Channel 2 output connected to the negative input of

the speaker.

Do not use the black ground (-) output terminal of either channel (the speaker

load must “float” away from the amplifier chassis).

When the rear panel switch is placed in the right “PARALLEL” position, the SX Series

operates in a unique Parallel mode. In this mode, only the signal present at the

Channel 1 input is used. This signal is then routed to both the Channel 1 and Channel

2 power amplifiers, thus producing a dual mono output, with the following power rat

ings:

SX1200 2 x 300 Watts at 8Ω and 2 x 450 Watts at 4Ω

SX1800 2 x 400 Watts at 8Ω and 2 x 600 Watts at 4Ω

SX2400 2 x 550 Watts at 8Ω and 2 x 750 Watts at 4Ω

SX2800 2 x 700 Watts at 8Ω and 2 x 900 Watts at 4Ω

SX3200 2 x 800 Watts at

8Ω and 2 x 1100 Watts at 4Ω

See pages 9 - 10 in this manual for interconnection diagrams when using the SX

Series in Bridge or Parallel modes.

WARNING: Bridge mode is to be used only when the SX Series is connected to an

8 or16 ohm speaker load. Use of Bridge mode with speaker loads of less than 8

ohms can result in severe damage to the unit due to excessive heat and current

limiting and will void your warranty!

INPUT

CHANNEL

1(+) OUTPUT

CHANNEL

2(+) OUTPUT

Bridge Mode

ENGLISH

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Samson SX1800 Manual

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