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Sub Group summing for Multi–Bus Compression technique

24 input 6 sub group summing mixer

6 x Fixed sub mixers (slave sum ABCDEF) with dedicated inputs, each sub mixer (slave sum) group come with individual insert send/return for external process – then return to Master for final summing.

24 dsub input channel
6 x stereo group send mixer

Sub group is a set of tracks together (whatever audio tracks you’d like to group) in a submix, create an aux track and then route to the main outputs or to post insert TRS, second mixer like Chandler then return via XLR to main master sum through Neumann transformers.

routing diagram sub group studio mixer summing
signal flow Neumann summing mixer


2U Standard Rack unit
Neumann v475-2C NOS
24 input DSUB Tascam Analog balanced
2 x Stereo out TRS balanced (Main / Monitor)
1-4 Group A Send/Return by switch via DSUB
5-8 Group B Send/Return by switch via DSUB
9-12 Group C Send/Return by switch via DSUB
13-16 Group D Send/Return by switch via DSUB
17-20 Group E Send/Return by switch via DSUB
21-24 Group F Send/Return by switch via DSUB
12 x TRS out 6 stereo (post group insert out)
6 x Routing switch post group insert:
On = Out to ABCDEF TRS out
Multi Master Insert SND/RET DSUB switch A/B
Master 2in1 Active/Passive switch
12 x stereo to 24 mono input conversion switch
Aux Input to Master sum XLR balanced L/R
2 x 21 step precision Neumann master gain ctrl L/R
White cream vintage style knobs
World Wide PSU with EU plug
Power LED: White
Gratis Custom Name Engraving