Roll Music Systems RMS755 User manual

USERS
MANUAL
ROLL MUSIC SYSTEMS INC
2010 EAST HENNEPIN AVENUE #33
MINNEAPOLIS MN 55413
612-379-3255
WWW.ROLLMUSIC.COM
Input channels:
Input impedance:
Maximum input level:
Output channels:
Output impedance:
Maximum output level:
Frequency response:
Crosstalk @1kHz:
Power requirements:
Two
40k ohms balanced
>+23dBu rms
Two
100 ohms balanced
>+29dBu rms
12Hz-32kHz +/-0.25dB
2Hz-150kHz +/-3dB
< -90dB
117VAC/0.160A
230VAC/0.080A
Technical Specifications
(Configured internally by qualified service technician)

1.Power Switch.Afterconfirmingandconnectingthecorrectmains
 voltage,pushswitchuptoengagepower.
2.Threshold.Continuouslyvariablecontrolofthresholdlevel,above
 whichgainreductionbeginstooccur.Exactthresholdleveldepends
 onthesettingsoftheothercontrols.
3.Sidechain Hi-Pass Filter.Pushbuttonswitchremoveslow-frequency
 informationfromthecontrolsignal.Thiscanpreventunwanted
 “pumping”onbassnotes,suchaskickdrum.Filterisfactoryconfigured
 for150Hzcornerfrequency.Pressbuttonintoengagefilter.
4.Ratio.4-positionrotaryswitchselectsoneoffourcompressionratios:
 1.5:1;2:1;4:1;or10:1.Changingtheratiowillautomaticallyadjust
 thethresholdsothatthetotalamountofgainreductionwillremain
 approximatelythesame,allowingformoremeaningfulcomparisonof
 theaudibleeffectsofdifferentratiosettings.
5.Attack Time.10-positionrotaryswitchselectsoneoftenattacktime
 settings.Thiscontrolshowquicklygainreductionbeginstooccur.A
 slowerattacktimewillallowmoretransientstobepassedwithoutgain
 reduction;afasterattackwilltendtoreducetransientlevels.Awide
 rangeoftonalvariationispossibleasaresult.Attacktimesare
 approximateandaremeasuredinmilliseconds.
6.Release Time.10-positionrotaryswitchselectsoneoftenrelease
 timesettings.Thiscontrolshowquicklyfullsignallevelisrestored
 aftergainreductionoccurs.Afastreleasetimewillincreasethe
 audibilityofthesustain,decay,andreverberantportionsofthesound.
 Aslowerreleasewilltendtobelessnoticeableonfullprogrammaterial.
 Releasetimesareapproximateandaremeasuredinseconds.
7.Program-Dependent Release.PushbuttonswitchactivatesProgram
 DependentReleaseTimemode.Thismodefeaturesadualrelease
 characteristicwhichoffersaslowerrecoveryfromlongpassagesof
 above-thresholdsignalaswellasafasterrecoveryfromshorttransients.
 TheReleaseTimecontrolswitchcontinuestofunctioninthismode,
 affectingthe“short”portionofthereleasecharacteristic.However,the
 releasetimesprintedonthefaceplatearenotaccurateinPDRmode.
8.Makeup Gain.Continuously-variablecontrolofoutputgainappliedto
 allsignal,indepentlyofanygainreductionoccurring.Rangeofthegain
 controlis-14dBto+20dB.Sincethisgainisappliedafterthecom-
 pressioncircuitry,itispossibletocauseoutputclippingbyexcessive
 clockwiserotationoftheGaincontrol.
9.Bypass.Pushbuttonswitchbypassesallcircuitry.Thisisatruehard-
 wirebypass,sothereisnoactivecircuitryinthesignalpathwhenthe
 bypassswitchisengaged.Itisequivalenttounpluggingtheinputand
 outputXLRcablesfromtheunitandconnectingthemtooneanother.
10.Gain Reduction Meter.Displaysinstantaneousdegreeofgain
 reductioninDecibels.MeterisnotaffectedbyappliedMakeupGain.
1. Mains power connector and fuse holder. Mainspowerisappliedvia
 astandardIEC3-prongpowercord(included).Mainsvoltageisselected
 internallyatthefactoryfor117VACor230VACnominalmains,andcan
 bereconfiguredinternallybyaqualifiedservicetechnician.Connectthe
 powercordonlytoaproperlygroundedoutletofcorrectmainsvoltage.
2. Balanced XLR audio input connectors. StereoAudioinputisona
 pairofelectronicallybalancedXLR-Fconnectorswithdifferentialsignal
 betweenpins2and3(pin1connectstochassisground).Unbalanced
 sourcesshouldbeconnectedbetweenpins2and1.
3. Balanced XLR audio output connectors. StereoAudiooutputisona
 pairofelectronicallybalancedXLR-Mconnectorswithdifferentialsignals
 betweenpins2and3.Unbalancedloadsshouldbeconnectedbetween
 pins2and1,withpin3leftunconnected.Donotgroundtheunusedpin.
RMS755SUPERSTEREOCOMPRESSORFRONTPANELCONTROLFEATURES
REARPANELCONNECTIONDIAGRAM