Summing Mixer - Documentation - Additional Options

Connections

DB25 (D-Sub) – TRS – XLR balanced (optional)

  • D-Sub DB25 Tascam Standard Analog Balanced
  • TRS  1/4″ balanced : Tip=hot (+), Ring=cold(-) Sleeve=GND
  • XLR balanced: 1=GND, 2=hot (+), 3=cold (-)

Input channels

Number and type  (optional)

1U Rack:

  • DSUB: up to 40-48 ch input
  • TRS: up to 32 ch input
  • XLR: 8 ch input

2U Rack:

  • DSUB: up to 96 ch input
  • TRS: up to 64 ch input
  • XLR: up to 16 ch input

3U Rack:

  • DSUB: up to 128 ch input
  • TRS: up to 96 ch input
  • XLR: up to 32 ch input

*free to choose mixed mode (d-sub+trs+xrl)

Output channels

Number and type  (optional)

1U Rack:

  • DSUB: up to 16 ch out (8 stereo)
  • TRS: up to 8 ch out (4 stereo)
  • XLR: up to 6 ch out (3 stereo)
  • * in case of 16ch input by D-Sub input

2U Rack:

  • order (there is no theoretical limitation)

3U Rack:

  • order (there is no theoretical limitation)

*free to choose mixed mode (d-sub+trs+xrl)

Master Active Passive switch

What’s the 2 in 1 (two in one) Active Passive?

  • this function enables to connect different kind of mic preamp instead of internal amp
  • freely can use a completely different sounding amplifier for gain makeup

There are two ways to control by A/P switch:

  1. Active mode: gain makeup by inside amp Neumann/Filtek/Lawo/NE2OX
  2. Passive mode: gain makeup by Your external micpres or DAW amplifiers

Benefits: Different amp = Different sound character

Active mode: both switches Up

  • 1st switch: signal to Inside amp (passive mode disabled)
  • 2nd switch: Inside amp signal to master out (passive excluded from signal chain)

Passive mode: both switches Down

  • 1st switch: signal to 2nd (bypass Internal amp)
  • 2nd switch:  signal to master out (Inside amp excluded from signal chain)

free to choose and use completely different sounding amplifier

FAQ – Why two switches instead of one?
  • Discrete dual balanced signal require 2 x 12  = 24 point solid state dual stereo balanced switching network
  • Dual switch: keeps it clean and isolated the dual balanced stereo signal flow from input to output

Stereo to Mono input conversion switch

STM – stereo to mono function

This function converts  Stereo input L/R (two hard panned L/R Input) signals to absolute center placed Mono signal.
However, for mono signals (such as kick, snares, lead vocals or bass that should appear in the middle of a mix), it would be a waste to use (Stereo L/R panned channels) what would amount to two required converters for a mono result.
For example, channel pairs 1L & 2R switched to mono (ST1 stereo to 1/2) both instruments become  placed in the center of the panorama.
  • (mono) KICK on channel 1Left,
  • (mono) BASS on channel 2Right

Routing from DAW to Sum

  • DAW Mono Kick: —-Stereo  Left out—  (interface Ch 1 Left out)—- sum Left 1IN
  • DAW Mono Bass:—-Stereo  Right out  (interface Ch 2 Right out)—–sum Right 2IN
  • switch to mono mode to place kick/bass in the  center of  panorama.
 

Please note!

Panning for instruments in the DAW sequencer (cubase, protools, flstudio, reaper, logicpro etc.) should place the kick hard left, the bass hard on the right, and so on.
 
 
* with STM(Stereo to mono)option can save a lot of DAW interface out
** no need to waste precious stereo CH’s for mono instruments
***clarity of position in the stereo field (mono is true mono)

Master Insert Send Return

Master Send/Return by switch control

This function allows to SEND master signal to external processors like EQ, Comp, Limiter, then RETURN to master out (print / record)
  • allows to switch between processed or unprocessed signals (comparison purposes)
  • Master SND/RET placed before master out
  • 100% of the signal routed to SEND
  • 1st switch: enable Send to external
  • 2nd switch: enable Return from external

Active mode: both switches Up

  • 1st switch: signal to External (enable send out)
  • 2nd switch: Return signal to master out (enable return)

Bypass mode: both switches Down (Bypass)

  • 1st switch: signal to 2nd switch (bypass send)
  • 2nd switch:  signal to master out (bypass return)

the 100% of master signal forwarded to send out

Available by TRS DSUB XLR balanced

FAQ – Why two switches instead of one?
  • Discrete dual balanced signal require 2 x 12  = 24 point solid state dual stereo balanced switching network
  • Dual switch: keeps it clean and isolated the dual balanced stereo signal flow from input to output

Master Insert Send Return chain

Multiple SEND/RETURN:

  • Connect  in CHAIN more than one external processor like Eq, Comp,Limiter or Mic Preamp
  • Dedicated Send Return connection and control before master out
  • Select or deselect – exclude or include – Send or Bypass the desired external gear within the chain

Passive summing 2 x Insert example:

  • SND A/RET A: Mic Pre 1
  • SND B/RET B: Mic Pre 2

Active summing 4 x Insert example:

  • SND A/RET A: Equalizer
  • SND B/RET B: Compressor
  • SND C/RET C: Limiter
  • SND D/RET D: Reverb

the 100% of master signal forwarded to send out

with BYPASS option can compare differences (eg. with compressor and without compressor)

Available by TRS DSUB XLR balanced

FAQ – Why two switches instead of one?
  • Discrete dual balanced signal require 2 x 12  = 24 point solid state dual stereo balanced switching network
  • Dual switch: keeps it clean and isolated the dual balanced stereo signal flow from input to output

Auto TRS Master Insert Send Return

AUTO TRS SWITCH

  • the signal was non interrupted if nothing connected to SEND
  • AUTO TRS SWITCH – internally switched balanced routing network

Master Out Control

Master out On/Off switch

By option can enable or disable (on/off) one or more than one of multiple master outputs 
 
Example:
  • Master Out A (on/off)
  • Master Out B (on/off)
  • Master Out C (on/off)

Master Stereo to Mono switch

Mix mono compatibility test 

  • placed before master outputs

The word ‘Mono’ is panned absolutely center. This means both Left and Right speakers reproduce the same word ‘Mono’ at the same volume. This also sounds ‘mono’ and so panned to the middle.

Checking your mix for Mono compatibility as you go is a good preventative measure.

Sometimes just because a mix sounds good in stereo doesn’t mean it will sound good when the left and right channels are combined into a mono signal. In some cases, you may hear what is known as comb-filtering, which will color the sound of your mix and cause peaks and dips in its frequency response. In some cases, instruments may lose their integrity or even seem to completely disappear from the mix!

Phase Invers switch

Phase Invers R side of stereo signal

Phase inversion is a subtle, yet versatile music production tool capable of many distinguished feats. First, what is phase inversion? Inverting a wave’s phase means swapping the location of its peaks and troughs. This creates cancellation when peaks of one wave coincide with the troughs of the other wave.

Phase Invers R + Master Mono mode

Reversing the phase of the right channel and mono-ing it with the left and sending the result to both speakers is particularly useful for assessing the width content of your mix and distortion characteristic by effectively replacing the ‘centre image’ with the out-of-phase information.
This provides an excellent way to check mono compatibility and to also learn spatial tricks from your favourite reference material.

Direct input to output switch

No Mix switch – ch input to output

By Direct out switch option can route a stereo channel input to master out, bypassing the summing network

  • Direct Monitor out switch on desired input (usually on stereo 1/2)
  • Stereo input 1 (ST1) L/R ——route to Master output  (or to summing amp inputs —Master Out)

Expansion input

Expansion input – linking

  • The Expansion Input is an additional stereo input which is routed to current summing network.
  • Typically this stereo input would provide for linking with another Summing unit.

Channel Insert Send Return

Stereo Input channel send return

The input signal  always present on corespondent send out (stereo ch)
by Return bypass switch can enable or disable:
  • Bypass switch off: Input—Sum network——Master out (regular summing operation)
  • Bypass switch on: Input—Send—External processor—Return—Sum network—Master out
  • Stereo to Mono conversion of signal perform after returns to Sum network

Sending 2 x Mono instruments on a stereo L/R channel:

Panning for instruments in the DAW sequencer (cubase, protools etc.) should place the snare hard left, the kick hard on the right.

Send to external:

  • Input 1L (snare)—Send—Compressor Left in
  • Input 2R (kick)—Send—Compressor Right in

Return from external:

  • Compressor Left out —Return 1L (snare)
  • Compressor Left out —Return 2R (kick)

Convert hard Left/Right instruments to Mono by STM switch

  • switch Stereo to Mono for mono conversion snare/kick 

STM (stereo to mono input conversion switch) read more about

Group Send Return

Sub Group summing

  • 4 x “slave” sum (A B C D)
  • 4 x Send /return
  • 1 x Master sum
 

Matrix Group Send Return

Matrix group send return switching network

 

Precision gain control

21 step precision resistor based internal amp gain control potentiometer

  • Number of steps: 21
  • Gold-plated signal path 
  • Extremely short signal path
  • Channel matching: +/-0.1 dB
  • Polished “S” shape wiper and contact pins

FAQ: why 2 pots?

  • Simply because Neumann is a dual stereo amp
  • Neumann 2C/2B electronic circuit require 2 x stereo potentiometers/side
  • Neumann 2B and 2C is a DUAL STEREO summing amp, 1st one for Left,  2nd one for R side.
  • Easy to equally set both L/R side gain by 2 x Stereo pot 

Single (one) pot solution?

 

Knob style

  1. Vintage style white cream “chicken head” knob
  2. Vintage style black “chicken head” knob
  3. Solid aluminium round black knob
 

others

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