User manual ROTEL RB-990BX

[. . . ] The exclamation point in an equilateral triangle indicates that it is necessary for the user to refer to the owner's manual. These symbols warn that there are no user serviceable parts inside the unit. Opening the chassis for any reason will void the manufacturer's warranty. If liquid is spilled on the unit, shut it off immediately and take it to a dealer for service. [. . . ] Although the unit is shielded against radio frequency and electromagnetic interference, extremely high fields of RF and EMI should be avoided where possible. · Make audio connections via XLR, 1/4" TRS, or 1/4" TS plugs. With the flexibility of the RB-990BX, various connection options are available. For input connection, use the XLR Microphone, 1/4" line or 1/4" instrument (front panel) inputs. For analog output connections, use either XLR or 1/4" Line output. The use of more than one connector at a time for the output section, could unbalance balanced lines, cause phase cancellations, short a conductor to ground, or cause damage to other equipment connected to the RB-990BX. Connect the AC power cord to the AC power receptacle on the back of the unit. Route the AC power cord to a convenient power outlet away from audio lines. The unit may be turned on and off from the rear panel power switch or from a master equipment power switch. 2. 2 Connection to a Mixing Console 1). Connect your mic cable to the Mic input of the RB-990BX NOTE: If you are using a mic with a separate power supply, such as a tube microphone, make sure that you are not sending two sources of +48V phantom power to the mic. Use the +48V Phantom Power switch on the RB-990BX for all other microphones which require phantom power. 2). For example, if you have AES/EBU format selected, an AES/EBU formatted signal will appear at the output of both the XLR and the RCA connector. Or, if you have S/PDIF format selected, an S/PDIF formatted signal will appear at the output of both the RCA and XLR connectors. Sync In and Out Connectors BNC connectors are provided for both word clock in and out functions. The RB-990BX's clock chips are dbx custom VCXO chips, designed for low-jitter performance. You may use the RB-990BX as a master clock source, having other equipment slave to the RB-990BX, or you may slave the RB-990BX's clock to any other word clock source. 3. 3 Sync Input Sample Rate Selection When connecting an incoming or master device to the sync input of the RB-990BX, the RB-990BX will automatically lock to the sample rate of the master device. The sample rate will then be indicated in the SAMPLE RATE select button. Note that when the master device is disconnected from the Sync Input connection, the SAMPLE RATE select button will flash until an internal sample rate is selected. ® RB-990BX User Manual 11 Section 3 Digital Applications RB-990BX 3. 4 Direct Connection to a DAW (CPU) S/PDIF Rear Panel Connections · · Connect the source to the desired 1/4" TRS or XLR input. Connect the AES/EBU or S/PDIF output of the RB-990BX and run into the AES/EBU or S/PDIF input interface of the DAW (CPU). Front Panel Digital Output Features 1). Use Use Use Use Use Use the the the the the the METER switch to select digital output metering. OUTPUT FORMAT switch to select the appropriate digital output format. ® 12 RB-990BX User Manual RB-990BX Digital Applications Section 3 3. 5 Direct Connection to a Digital Mixer (insert) THRESHOLD THRESHOLD GAIN REDUCTION dB 30 27 24 21 18 15 12 9 6 4 2 1 -24 INPUT / OUTPUT LEVEL dBu -18 -12 -6 0 +6 +12 +18 THRESHOLD THRESHOLD THRESHOLD GAIN REDUCTION dB 30 27 24 21 18 15 12 9 6 4 2 1 -24 INPUT / OUTPUT LEVEL dBu -18 -12 -6 0 +6 +12 +18 THRESHOLD -+ CHANNEL ONE 2:1 -20 1. 6:1 4:1 -30 SC Enable 3:1 - O + OverEasy 0 +10 2:1 Contour 3:1 + -+ CHANNEL TWO 2:1 -20 1. 6:1 4:1 -30 0 1. 4:1 SC Mon 1. 2:1 RATIO 8:1 SC Enable 3:1 - O + OverEasy 0 +10 2:1 Contour 3:1 + -40 -60 -20 -10 4:1 6:1 1 10:1 . 35 . 15 125 50 12. 5 -10 0 +10 +6 +8 +12 +16 Stereo Couple -60 -40 -20 -10 4:1 6:1 1 10:1 . 35 . 15 125 50 12. 5 -10 0 +10 +6 +8 +12 +16 PROFESSIONAL PRODUCTS OFF dBu +15 THRESHOLD 0 1. 4:1 1. 2:1 RATIO 8:1 1066 Compressor/ Limiter/Gate S/PDIF or AES/EBU SC Mon -40 dBu +20 THRESHOLD Auto 1:1 RATIO :1 3 dB/mSec . 04 ATTACK 250 dB/Sec 5 RELEASE I/O Meter -20 dB +20 OUTPUT GAIN Bypass +4 dBu OFF PeakStopPlus Auto 1:1 RATIO :1 3 dB/mSec . 04 ATTACK 250 dB/Sec 5 RELEASE I/O Meter -20 dB +20 OUTPUT GAIN Bypass +4 dBu OFF PeakStopPlus OFF dBu +15 THRESHOLD -40 dBu +20 THRESHOLD EXPANDER / GATE COMPRESSOR LIMITER EXPANDER / GATE COMPRESSOR LIMITER Rear Panel Connections · Connect the source to the desired 1/4" TRS or XLR input jack. · Connect the AES/EBU or S/PDIF output of the RB-990BX and run into the AES/EBU or S/PDIF input of the digital mixer. Front Panel Digital Output Features 1). Use Use Use Use Use Use the the the the the the METER switch to select digital output metering. OUTPUT FORMAT switch to select the appropriate digital output format. ® RB-990BX User Manual 13 Section 3 Digital Applications RB-990BX 3. 6 A/D Conversion S/PDIF or AES/EBU Rear Panel Connections · · Connect the source to the desired 1/4" TRS or XLR input. [. . . ] This seems reasonable until you realize that 1/2 of the full-scale input is only 6 dB below full-scale!So half of the codes are used to represent only the top 6 dB of signal information, while the other half are used to represent the remaining 80 to 110 dB of signal information, depending on the quality of the converter. It seems not only reasonable, but also desirable, to utilize the increased signal resolution afforded by this density of digital codes to represent more input dynamic range in this region. Another advantage of the logarithmic mapping of our dbx Type IVTM Conversion System is that it preserves the high-frequency detail of the signal in the overload region. [. . . ]