Qsc - Dspolrty 电路图.pdf

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1、Summary When using a DSP-3s Dataport output connection to the input of a QSC amplifier, the output at the speaker terminals of the amplifier will be inverted with respect to the DSP-3 Euro-style inputs and outputs. This effects units with serial numbers 0900XXXXX and earlier. This situation can easi

2、ly be corrected with a little careful wiring or manipulation of the DSP-3 software. The DSP-3 is being redesigned to correct this problem. We apologize for any inconvenience. Note: If DataPorts ONLY are used there is no problem; if Euro-style connections ONLY are used, there is no problem. Input Con

3、nections There are two exclusively separate methods of applying input to the DSP-3: 1-using the Euro-style green INPUT connectors, or 2-by attaching a CM16a, DCM, or similar device to the DataPort INPUT connector. Output Connections There are three possible methods of using the outputs of the DSP-3:

4、 1-using the Euro-style green OUTPUT connectors to supply audio to any amplifier (or other device), or 2-using the DataPort OUTPUT connector to attach directly to a QSC DataPort-equipped amplifier, or 3-in combination, to connect to a QSC DataPort-equipped amplifier while using the Euro-style OUTPUT

5、 connectors to supply audio to other amp(s) or device(s). The various combinations of inputs and outputs could lead to a polarity reversal situation. The exact solution will depend on the particular combination of inputs/outputs used. Refer to the matrix below for the solution(s) to your situation:

6、OUTPUTS Euro-style ONLYDataPort ONLYDataPort AND Euro-style Euro-styleA Either C or D (but not both!) Both B and C (do both!) INPUTS DataPort Device Either B or D (but not both!) AB Solutions: A) Do nothing! The speaker outputs will have the correct polarity with respect to the audio input of the de

7、vice. B)Reverse the +/- wires of the OUTPUT Euro-style connectors. C) Reverse the +/- wires of the INPUT Euro-style connectors. D) Change the polarity in software using Signal Manager (so you will not have to re-wire): 1-Start Signal Manager, then choose the ConfigurationEdit menu. 2-Select the POLA

8、RITY tool from the INPUTS AND OUTPUTS PALETTE (toolbar). 3-With the mouse pointer over the signal path, click the left mouse button to add the POLARITY object to each signal path. 4-When finished adding one POLARITY to each path, revert to the SELECT mode. 5-Double-click on each POLARITY object until a negative symbol (-) is displayed. If you have any questions or comments please contact the QSC Sales Department at (800) 854-4079, or call QSC Technical Services at (800) 772-2834. DSP-3 Input/Output Polarity Issue (Hardware) 21 January, 2001 RadioFans.CN 收音机爱 好者资料库