Samson SX1200 Owner's Manual

Contents

Samson SX1200 Owner's Manual Manual pdf 11 page image

Bridge and Parallel ModesThe SX Series provides a rear-panel switch that allows it to be used in either a Bridgeor Parallel mode. When this switch is placed in the “STEREO” (center) position, the SXSeries 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 bridgedtogether, producing a single output signal with 900 watts for the SX1200, 1200 wattsfor the SX1800, 1500 watts for the SX2400, 1800 watts for the SX2800 and a massive2200 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 loadconnected so that power is derived from both channels. The effective voltage swingseen 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 asshown in the illustrations on page 9 (and as silkscreened on the rear panel), with thered (+) 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 ofthe speaker.Do not use the black ground (-) output terminal of either channel (the speakerload must “float” away from the amplifier chassis).When the rear panel switch is placed in the right “PARALLEL” position, the SX Seriesoperates in a unique Parallel mode. In this mode, only the signal present at theChannel 1 input is used. This signal is then routed to both the Channel 1 and Channel2 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 4ΩSX1800 2 x 400 Watts at 8Ω and 2 x 600 Watts at 4ΩSX2400 2 x 550 Watts at 8Ω and 2 x 750 Watts at 4ΩSX2800 2 x 700 Watts at 8Ω and 2 x 900 Watts at 4ΩSX3200 2 x 800 Watts at 8Ω and 2 x 1100 Watts at 4ΩSee pages 9 - 10 in this manual for interconnection diagrams when using the SXSeries in Bridge or Parallel modes.WARNING: Bridge mode is to be used only when the SX Series is connected to an8 or16 ohm speaker load. Use of Bridge mode with speaker loads of less than 8ohms can result in severe damage to the unit due to excessive heat and currentlimiting and will void your warranty!INPUTCHANNEL1(+) OUTPUTCHANNEL2(+) OUTPUTBridge ModeENGLISH9