Assessments - 1, GPA: 4
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Facilidade de uso
Once initially setup the computer becomes optional. The key to the MPX-6 operating as a stand alone mixer is distributed intelligence™. In an IQ System the brains of the system live out in the system. This means the audio system is not going to be lost even if the computer or communication cables fail. The MPX-6 is an ideal choice for applications where computerized manual mixing or routing is desired and the automation of the SMX-6 or AMB-5 automatic mixers is not required. HARDWARE BLOCK DIAGRAM Refer to the pictures of the front and rear panels shown above and the block diagram of the MPX-6 mixer on Page 2. Audio Main Inputs: Six balanced inputs with removable 3 pin barrier block. The preamp stage includes: • M/L/P switches set each input to line level (L) with 0 dB gain, mic level (M) with 25 dB additional gain, or phantom (P) which is 25 dB additional gain and +44 VDC phantom power. + AUDIO IN 1 LM P 0 -5 -10 -12 5 10 ADD 25 15 21 FOR MIC • A trim pot at each input allows for prefade gain adjustment of –12 dB to +21 dB gain after the M/L/P switch. There are two VCAs under processor control at the output of each preamp. One VCA controls the gain from input to output mix 1 and the other VCA controls gain from the input to output mix 2. The net result is 12VCAs total. Audio Stack Inputs: Two inputs, one per output mix. Connections are via unbalanced RCA phono jacks. These inputs are op-amp isolated. There is no processor control of audio coming into these inputs. The purpose of the stack inputs is to allow construction of a wide mixer with more than six inputs by taking the outputs of one mixer and going into the stack inputs of a second mixer. This means that main inputs do not have to be used to expand the effective size of the overall mixer. Audio Main Outputs: There are two summing buses. Each summing bus provides the output mix for the corresponding output channel. Op-amps buffer the summing bus to the output connection and balance the audio output. The outputs are via 3 pin removable barrier blocks. ++ AUDIO OUT 1 MAIN BUS STACK IN Audio Bus Outputs: In addition to the two main outputs, there are also two bus outputs. Bus outputs 1 and 2 provide the same audio output as main outputs 1 and 2. Op-amps buffer the summing bus to the output connection and balance the audio output. What makes the Bus Outputs different are relays under processor control which may be used to turn on or off the Bus Output drive. 3 Pin removable barrier blocks are used. Aux Port: The unit is equipped with a TB-3M type mini-XLR port. This port may be used to provide a control signal or sense a control signal. Pin 1 is ground reference. Pin 2 is output under processor control. When on it provides 10 VDC at 16 ma. When off it is open collector (high impedance). Pin 3 is sensing input. +5 to MPX-6 Mixer (Page 1 of 3) +30 VDC is sensed as a logic high. The circuit floats, therefor tie to ground or TTL source for definite high or low. Indicators: A Power light on the front panel indicates the unit is powered. A DSPI data signal presence indicator indicates communication. Crown Bus Port: The Crown Bus is a serial data loop where components are connected into the loop and one component serves as system interface for all. This unit may serve as a system interface or may simply operate as a component on a Crown Bus data loop. Although the Crown Bus may function on a variety of media, Crown uses a two-wire 20 ma current loop for input and output Crown Bus connections. On this unit connections are made via 4 pin removable barrier block. Even if the unit is communicating directly with a PC via its serial port, it always functions in software as an addressable component on a Crown Bus loop. The unit must have a valid loop address. A valid address is: • 1 to 250 set via 8 segment DIP switch • No other MPX on the same Crown Bus data loop may have the same address. The Crown Bus is asynchronous with 8 data bits, 1 start bit, 1 stop bit, no parity, and operates at 38400 baud. The MPX is not a U-Code protocol component. Serial Port: The serial port on this unit is a female 25 pin D-Shell. RS232 and RS422 are supported with 8 Data bits, 1 start bit, 1 stop bit, no parity. Up to 19200 baud supported. The serial port for the AMB may be used for direct communication with a PC such that the AMB serves as interface: @crown® * System® Product Reference @crown® * System® Product Reference INPUT 1 PRE-AMP BALANCED BUCHANAN CONNECTOR GAIN POT (-12 to +21dB) M/L/P SWITCH P = +25dB/+44VDC M = +25dB L = 0 dB VCA 1-1 VCA 1-2 RS232/RS422 DB25 POWER SUPPLY MEMORY BATTERY BACKUP CROWN BUS AUX PORT 3-PIN MINI XLR ENABLE DSPI 12345 6 7 8 12345 6 BAUD RATE & PARITY IQ ADDRESS 4-PIN BUCHANAN ACTIVE BALANCE OUTPUT AMP ACTIVE BALANCE OUTPUT AMP ACTIVE BALANCE OUTPUT AMP ACTIVE BALANCE OUTPUT AMP SUMMING MIX BUS 1 SUMMING MIX BUS 2 STACK INPUT 1 STACK INPUT 2 FROM CPU FROM CPU BUS 1 RELAY BUS 1 RELAY FROM CPU FROM CPU MAIN 1 OUTPUT BALANCED BUCHANAN CONNECTOR BUS 1 OU...