Lab.gruppen PLM Series PLM 10000Q Quick Start Manual

Also see for PLM 10000Q: Supplementary guide User manual addendum Specifications Technical data Operation manual

Contents

Lab.gruppen PLM Series PLM 10000Q Quick Start Manual Manual pdf 14 page image

14 PLM Series Quick Start and Field Reference Guide6.5 Gain Settingsthe architecture of the PLM Series provides gainadjustments at a number of points in the signal flowpath. thus, there are many places in which one canadjust the levels in the PLM. Each point serves adifferent purpose.More detailed information on gain settings can befound in the PLM operation Manual section 8.1.the following can be used as guidelines for adjust-ment of the gain settings, from input to output. theblock signal flow diagram below can also be used asa reference to help in understanding the signal paththrough the PLM’s architecture:Input headroom (Analog Inputs)as a rule, this should be set to 12 dBu if the sourceis (or can be) limited to 12 dBu; otherwise it shouldbe at 26 dBu. this setting has no direct influenceon the rest of the gain stages in the PLM, or on theoverall noise floor. the PLM’s variable input gain isstrictly meant to provide the appropriate headroom atthe input stage. (adjust in i/o Config window, inputConfiguration, left side.)Input mixerthis setting should be left at “0” for most setups. ifonly one input channel is used, the other can be setto “- inf”. (adjust in i/o Config, module pane.)Module output gain (Levels)two points of gain level adjustments are provided perModule output. they are used to balance the mutualgain between frequency bands in a multi-way set up,and can be described as follows:- Manufacturer gain: this is “hidden” within themodule file and is set by the creator of the file. assuch, it is not user editable.- User gain: this is editable by a user. the module file(part of the fingerprint) contains a default value for thisas well as the manufacturer gain. if the manufacturergain is set to a non-zero value, then the default usergain is zero dB so that the user can easily see anychanges that have been made to this setting. it shouldnormally not need to be adjusted by the user.Output gain (Levels)one adjustment is provided per output channel inthe module to balance the mutual gain betweenfrequency bands in a multi-way set up. Generally, this6 QUICK sTArT TUTOrIAlFigure 6.5: PLM Signal Flow Diagram (Part 1)InputRouter1(Mute)InputRouter2(Mute)InputMixer AInputMixer BEQ DelayEQ DelayCrossoversOutput EQOutput EQOutput EQOutput EQModule:GainPhase RevMuteAnalog 1/2AES 1AES 2Dante XDante YAnalog 1/2AES 1AES 2Dante XDante YModule Output:Gain/LevelPhase RevMuteModule:GainPhase RevMuteModule Output:Gain/LevelPhase RevMuteModule Output:Gain/LevelPhase RevMuteModule Output:Gain/LevelPhase RevMute412 312 3