XTA C2 Operator's Manual

XTA C2 Operator's Manual Manual pdf 27 page image

C2 Operators Manual Page 27Operating NotesOperating LevelWith any audio signal processing equipment it is necessary to ensure adequate signallevel is used through the device, to avoid sacrificing noise performance. It is suggestedthat the operating level chosen should give adequate level to just light the -12dB LEDon the headroom meter with maximum program level being used. Since the meter isdeliberately set to show clipping 3dB early, this still provides 9dB of headroom beforeclipping occurs. With equalisation in use it may be necessary to further reduce theinput level, as gain within the unit may cause digital clipping, indicated by the top redLED's lighting independently of the rest of the meter.It should be noted that the figure quoted for the maximum input level options is theclipping point for that option (not a safe operating level). Always ensure that thisclipping point is no lower than that for the following equipment in the signal chain,and allow extra margin if equalisation sections are boosted.GroundingThe Screen (shield) pins on all audio connectors are normally connected directly tothe ground pin of the IEC mains inlet. The chassis is also directly connected to thispin. Never operate this unit without the mains safety ground connected. Signalground (0V) is in turn connected to the chassis ground.To avoid ground loops, cable shields should be connected to ground at one end only.The normal convention is that the shield is only connected at the output XLR.Provision is also made for separately isolating each input and output shield pinpermanently within the C2 by breaking the appropriate PCB track, where markedwith a box and an arrow next to each XLR connector using a small drill bit or cutter.See the following diagram for details.XLR pin 1 Isolation points (arrowed) and 10dB pads (circled)

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