This week I installed the TMC-1-Penta with a Dolby RMU, although there were one or two problems the system worked correctly. I will be modifying the TMC-1 software to provide more elegant solutions to the problems found. My to-do list has become bigger!
The last problem was interesting, as you can see from the signal flow diagram below there is a 10dB loss in the signal passing through the RMU to allow headroom for the speaker equaliser. This causes a problem when switching from 7.1.4 from the RMU to 7.1 or 5.1 from Protools.
7.1.4 and 7.1/5.1 Signal Flow (Click on image to enlarge)
10 dB of gain is added to the RMU return to make up for the 10dB attenuation through the RMU. The TMC-1 originally configured the Penta 720 with unity gain for 85 dB spl, to ensure that the speaker outputs do not clip a 10dB loss is inserted in the NTP Penta Output, This will also allow for internal summing and where digital outputs are used external equalisers.
The last problem was interesting, as you can see from the signal flow diagram below there is a 10dB loss in the signal passing through the RMU to allow headroom for the speaker equaliser. This causes a problem when switching from 7.1.4 from the RMU to 7.1 or 5.1 from Protools.
10 dB of gain is added to the RMU return to make up for the 10dB attenuation through the RMU. The TMC-1 originally configured the Penta 720 with unity gain for 85 dB spl, to ensure that the speaker outputs do not clip a 10dB loss is inserted in the NTP Penta Output, This will also allow for internal summing and where digital outputs are used external equalisers.
