User manual BLUE SKY BASS-MANAGEMENT CONTROLLER MK II

[. . . ] Bue Sky Internationa 70SeaLane Farmingdale, NY11735 www. abluesky. com Bass-Management Controller Owner's Manua MK II Version1b|August5, 2005 Contents Important 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Safety Instructions _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Page3 Philosophy and Introduction _ _ _ _ _ _ _ _ _ _ _ _ _ _ Page4 Important Notes About This Owner's Manual _ _ _ Page4 The Blue Sky | BMC MK II - What is included?_ _ _ _ Page4 A Tour of the BMC MK II I/O Unit _ _ _ _ _ _ _ _ _ _ _ _ Page5 A Tour of the BMC MK II Remote _ _ _ _ _ _ _ _ _ _ _ _ Page5 System Gain, Sub Offset and Level Overview _ _ _ Page7 BMC MK II Power Up Sequence _ _ _ _ _ _ _ _ _ _ _ _ _ Page7 Software Features _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Page8 5. 1 Speaker Placement _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Page10 5. 1 System Wiring Information & Diagram _ _ _ _ _ Page11 5. 1 System Calibration _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Page12 Additional Surround & Setup Information _ _ _ _ Page15 Dual BMC MK II I/O Unit Setup _ _ _ _ _ _ _ _ _ _ _ _ _ Page16 Technical Information & Specifications _ _ _ _ _ _ Page18 Product Dimensions _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Page18 Factory Service Instructions _ _ _ _ _ _ _ _ _ _ _ _ _ _ Page19 General Contact Details _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Page19 Contents Safety Instructions 1 READ INSTRUCTIONS-Readallsafetyandoperatinginstructions beforeoperatingthisproduct. RETAIN INSTRUCTIONS - Retain these safety and operating instructionsforfuturereference. HEED WARNINGS-Followallwarningsonthisproductandinthe operatinginstructions. [. . . ] www. abluesky. com C L R D=B 30° 110° LS RS Reference Monitoring Position SPEAKER PLACEMENT AS DOCUMENTED IN RECOMMENDATION ITU-R BS. 775-1 Figure 2 Center of the tweeter Center of the woofer Mid-point of the woofer and tweeter MONITORING HEIGHT RECOMMENDATIONS Page10 10. System Wiring Information Diagram Use high-quality, shielded cables to connect your console, workstation or othersourcestoyourBlueSkyBMCMKII. Foil-shieldedcables, suchasBelden 8451, 8761, or 9501 should do quite well. Other high quality cables are availableandthosethatincorporatebettershieldingwillyieldanoverallhigher noiserejection, loweringyoursystemssusceptibilitytoexternalinterference. Anotherimportanttiptokeepinmindwhenwiringyoursystemistorouteall linelevelcablesawayfromtheACandotherpowersources, thiswillreduce theprobabilityofhavingAChumemanatingfromyourmonitoringsystem. 5. 1 Channel Output From Console or Workstation bass management controller MK II 5. 1 Channel Output From the BMC going to the monitoring system. NOTE: Connect the SUB output to the DIRECT input on the subwoofer. SUB e ot m b le Re l Ca Co BM n t r o C C L R ° LS RS 5. 1 Channel Monitoring System Page11 11. 5. 1 System Caibration The following sysetm calibration instructions are for a bass-managed speaker system, such as Blue Sky's ProDesk, Sky System One, or Big Blue system. There are three steps to the calibration procedure: 1-Settingtheelectrical/digitalsignallevel 2-Settingthereferencelevel(REF) 3-SystemAcousticLevelSetting IMPORTANT NOTE: The individual channel level trims (+/- 6dB) in the BMC MK II, are "OUTPUT" channel level trims, and are used to adjust the relative levelbetweentheSUBandSATin. 5dBincrements. Thereasonthisfactis important, isbecauseincertainapplications, suchasinafilmsetupwherethe surroundsmayneedtobeatalowerlevelascomparedtothefrontspeakers, theleveladjustmentsforthesurroundsmustbedonebeforethesignalhitsthe BMCMKII. ThisisbecauseifyouadjustthesurroundlevelonlywiththeBMC mainchanneloutputleveltrims(mainchannels=L, C, R, LS&RS), theSUBand SURROUNDlevelmaynotmatch. SETTING THE ELECTRICAL / DIGITAL SIGNAL LEVEL The instructions included with in this manual detail two sperate ways to do step 3. One method uses bandwidth limited test files and requires only a SPL meter. The other method uses full-bandwidth pink noise and requires the use of a 1/3 octave real time analyzer (RTA), along with a SPL meter. Before starting the calibration procedure you will need to download BlueSkyTestFiles. zip(18MBfile)bygoingtowww. abluesky. com/calibration. To downloadthetestfile, "RightClick"thefile, select"SaveTargetAs"andthefile willbegindownloading. Oncedownloaded, un-zipthetestfilesandeither burnthetestfilestoaCDorimportthemintoyourDAW. BlueSkyTestFiles. Zip Includes 4 files: 1000HzSINEWAVE-20dBFS. wav­a1kHzfilerecordedat20dBFSforelectricalcalibration 40-80HzPINKNOISE-20dBFS. wav­a40Hzto80Hzbandwidth limitedpink-noisefilerecordedat-20dBFS 500-2. 5kHzPINKNOISE-20dBFS. wav­a500Hzto2. 5Hz bandwidthlimitedpink-noisefilerecordedat20dBFS PinkNoisefullbw-20dBFS. wav­afull-bandwidthpink-noisefile recordedat-20dBFS Step 1 Step 2 TURN OFF THE MONITORING SYSTEM "Bass Managed IN" - HolddowntheSELECTbuttonfor5seconds to enter SETUP MODE. Then press select 3 times, or until the displayreads"SETUP"(shownbelow). PresstheUPorDOWNARROWkeysuntilthedisplayreads"BASS MANAGEDIN". Ifthedisplayreads"BASSMANAGEDOUT"then presstheYESbuttontoturniton. · · · · Step 3 Now press the SELECT button 3 times, or until the display reads "CALCHANNELS". These test files are all mono files. Please make sure you hard assign them to the left and then the right (etc. ), not both channels at the same time. If you are using a CD player as your source, use only one channel of the CD player. All test signals are recorded at ­20dBFS including the 1 kHz sine wave tone. The sine wave tone is used to set the electrical output level throughout the signal path, right up to the point you get to the speakers, while the various pink noise signals are used for acoustic measurements and calibration. THEORY Thepurposeofcalibrationistoadjusttheoverallelectroacousticsystemgain sothat0dBVUofelectricalsignallevelequalsacertainacousticlevelatthe listening position. Since most recording media is now digital, the reference electricalsignallevelisusually­20dBFSwith20dBofheadroom. Thereference SPLlevelhowevercanvarybasedonthedeliverymediaandspeakertype. Pleasenotethatthebandwidthlimitedsignalsthathavebeenprovided, limit manyoftheroominteractionaffectsoftenassociatedwithmeasuringSPLusing broadbandpinknoise. *Also, please note that the LFE channel gain in a 5. 1 system varies from 0dB to +10dB, depending on the encoding format that is being used. Since the LFE channel is not calibrated as a separate entity, the LFE gain will not affect system calibration. [. . . ] The LFE Input on the MAIN unit (1), should be used for connectiontotheLFEChannel. TheLFEInputontheAUXI/Ounit (2), shouldbeusedastheLFinputcomingfromtheSUBoutonthe MAIN(1)I/Ounit. 4. TogetthemostelectricalLFheadroom, setboth"SUBOFFSET 1 "and "SUB OFFSET 2" to -10dB. 5. TheLFEGAIN1(mainI/O)settingcanbesettoeither+10or 0dB, depending on the format being used (Dolby recommends +10dBforDolbyDigital). "X. 2" System Setup: This setup applies to any system with two I/O units, wherethebassforeachI/Ounitisbeingrouteddirectlytoasubwoofer. This setuprequiresaminimumoftwosubwoofer. Thiscanbeanysystemallthe wayupto10. 2channels. Becausetherearenoacceptedstandardsforthis typeofconfiguration, wehavenospecificrecommendations. However, all settingswhichwereavailableina5. 1systemarenowalsoavailableforupto 10. 2channelsandcanbeconfiguredtoyourliking. For additional information, with regard software and setup, please go the Software Features section on page 8. [. . . ]