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I-Mon AES Revisions

My plans for the I-Mon changed on the first day of the AES in New York, where I was informed that Netflix and possibly Amazon had decided on 9.1.6 as there home cinema format! I decided to include this format in the new I-Mon design. Unfortunately this will put back the release of the I-Mon Analogue immersive Monitoring system to January 2018.

Dolby also informed me that in most installations the Surround bass extension speakers are placed next to the LFE speaker. To simplify installation I decided to provide Surround bass extension via the main LFE output.

What does this imply for the I-Mon design?

The A-Mon frame has 32 inputs and 24 outputs with an extra 8 outputs if External Metering available as an option.

To optimise the use of inputs and outputs I decided to add the extra 4 inputs and outputs required by 9.1.6 to the 7.1.4 design using links on the board and software settings. This allowed the I-Mon to be configured for 9.1.6, 7.1.4 or 7.1.6 using links to assign inputs and outputs.

The metering switching also needs to be enhanced to allow all 16 outputs to be monitored in two banks of 8.

I-Mon Revised specifications for 7.1.4, 9.1.4 and 9.1.6

I-Mon Immersive Monitor Controller

Note. Links are used to switch between Cue Input 3 or T/B input 2 and L/B Mic input 2

Design Considerations for the I-Mon Immersive Audio Monitoring system

The I-Mon is our new 7.1.4 Immersive Audio Monitoring system, based on our existing A-Mon Monitoring system with a number inputs and outputs reassigned. The combination of the I-Mon and TMC-1 is a stand alone Atmos capable system for the smaller studio.

The problem with analogue circuitry is that unlike digital systems the routing is defined by the hardware. The modular design of the A-Mon enabled the I-Mon to be made by redesigning a single board.

I-Mon Specification

Inputs

::

Outputs

Main Input : 7.1.4

Alt Input: 7.1

2 dedicated Stereo inputs

2 or 3 Stereo and/or cue inputs

Stereo AFL input

1 or 2 Talk back inputs

1 or 2 Listen back inputs

Main Output: 7.1.4

Alt Output or Rear Bass Extension: Stereo

Mini Output: Stereo

4 Cue Send Outputs

Stereo Downmix Output

Optional External Meter O/P

Slate Out

You can download a I-Mon/A-Mon/XMon comparison chart  

comparison.pdf

The I-Mon uses the same chassis as the A-Mon and has the same number of inputs, outputs and internal switches, the design of the I-Mon involved some compromises and rethinking,

1) Remove some A-Mon features for listening to 5.1 and 7.1 on Stereo speaker or 7.1 on  5.1 speaker layouts - No Centre speaker, No Rear speakers, No LFE Speaker.

2) Reassign  2 Stereo inputs  as 4 Overhead inputs

3) Reassign 4 of the Alt outputs as 4 Overhead outputs

4) reassign 2 of the Alt outputs as Left and right Surround Bass Extension or Stereo Alt Output.

5) Cue input 1 can reconfigured as 2nd Talkback and 2nd Listen Back inputs.

6) Reassign SLS and H/P metering as Overhead input metering

7) Move Left and Right Metering to after Left and Right Source selection to allow SLS and H/P metering when PFL active

8) Add switching enabling the Cue Inputs be used as stereo inputs

9) Add an External metering output.

10) Add an Ethernet remote control connection

The PCB layout for the new card is now complete, we are now consulting with users before ordering and making the PCB's and metalwork. We welcome your input, especially before we commit the design to hardware!

Delivery for the I-Mon is currently about 6 weeks.