The Yamaha O2R Mixers at UTEMS

The Yamaha O2R mixers in EMS II and EMS III are configured similarly, but not identically. Each mixer has 4 digital I/O (input/output) card slots, providing a total of 32 channels of digital I/O. In addition, there are line-level analog inputs for each of the 24 input mixer channels, the first 8 of which have microphone inputs, as well.

Common to both EMS II and EMS III:

 Card Slots 1 and 2 contain ADAT interface cards and provide digital I/O to 16 channels of ADAT, via the Alesis ADAT optical digital interface. The inputs from Slot 1 are available as Tape inputs 1-8 on the O2R; those from Slot 2 are available as Tape inputs 9-16.

 Card Slots 3 and 4 contain AES/EBU interface cards, each of which has 8 input/output channels. Slot 3 is connected to Protools channels 1-8, while Slot 4 is connected to the 8 AES/EBU input/output jacks (XLR connectors) available on the digital patch bays. The inputs from Slot 3 are available on the O2R as Mic inputs 1-8, while those from Slot 4 are available as Mic inputs 9-16.

 Signals in the O2R can be routed to various destinations, including one or more of 8 digital output channels. Signals routed to any of the 8 channels are automatically sent to the corresponding channels of all four Card Slots simultaneously. For example, routing a signal to output channel 3 of the O2R will cause the same signal to be sent to channel 3 of ADAT no. 1 (via Card Slot 1), channel 3 of ADAT no. 2 (via Card Slot 2), channel 3 of Protools (via Card Slot 3), and channel 3 of the digital patch bay (via Card Slot 4).

 The Clock Source for the O2R should normally be set to Internal 48K (or Internal 44K, if you are preparing something for CD mastering). Typically, Protools and Peak on the Mac will be set (via Hardware Setup) to use external sync, as will the Alesis BRC, so the O2R can usually provide the master clock source for the entire system. Important: The only exception to this setup occurs when the Panasonic SV3700 DAT machine is digitally connected as an input source. The SV3700 cannot slave to an external clock source, so if it is digitally connected to the O2R via 2TR-D1, for example, then 2TR-D1 must be clock source. Please reset the system to the normal setup when you are done.

Differences between EMS II and EMS III:

 In EMS III, the digital outputs of the Panasonic SV3700 DAT machine are hard-wired to the 2TR-D1 digital inputs on the O2R, and the stereo AES/EBU digital outputs of the O2R are hard-wired to the digital inputs of the DAT. Consequently, it is not necessary to do any digital patching to play back or record DATs using the O2R in EMS III.

 In EMS II, there are two Panasonic SV3700 DAT machines, which are frequently used to make digital dubs. Consequently, neither machine is hard-wired to the O2R, but instead, the digital inputs and outputs of each DAT are brought out to the digital patch bay. Therefore, in order to use the O2R to record and play back digitally to/from a DAT in EMS II, it is necessary to make the appropriate connections on the digital patch bay. See Digital Input from DAT to O2R.

 In EMS III, the Control Room outputs of the O2R are hard-wired to the power amps/speakers. The left output goes to amp/speaker channels 1 & 3; the right output goes to amp/speaker channels 2 & 4. Consequently, it is not necessary to do any patching in order to hear something on the O2R. Just make sure the Control Room level is turned up and the power amps are turned on.

 In EMS II, the "Control Room" outputs of the O2R are wired to the "External" inputs on the monitor section of the Mackie board.

Using Pro Tools with the O2R | Digital In from DAT to O2R | The Eventide DSP4000 and O2R | Documentation Index

Revised 8/31/2005 by RP