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:
- Active mode: gain makeup by inside amp Neumann/Filtek/Lawo/NE2OX
- 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)
- use your DAW inputs or mic pres for the gain, that way you have flexibility over the character.
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 on Stereo input L/R (two hard panned L/R Input) signals to absolute center placed Mono signal.
- (mono) SNARE on channel 1Left,
- (mono) KICK on channel 2Right
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 (2) 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.
Routing from DAW to Sum
- DAW Mono Snare: —-Left side of stereo out— (interface Ch 1 Left out)—- sum Left 1IN
- DAW Mono Kick:—-Right side of stereo out (interface Ch 2 Right out)—–sum Right 2IN
- switch to mono mode to place snare/kick 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: Compressor
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
As soon as you connect something to the SEND OUTPUTS the main signal gets interrupted, is then processed through an external device and is brought back to the summing mixer via the RETURN INPUTS – whether it is an INSERT or a SEND FX. The amount of SEND FX signal (like the amount of a reverb) then depends on the DRY/WET signal of the SEND FX device)
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 Invert switch
Phase Invert 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 Invert 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 Monitoring - input to output switch
No Mix switch – route desired stereo L/R input to *Output
For example is really useful in the case when audio editing in DAW and there is no need the mixer for summing – mixing purposes, you can use by default DAW interface 1/2 dedicated monitor outputs for direct monitoring.
“Direct Monitoring.” This refers to the ability to monitor signal directly from the interface, bypasses selected Input by DIR SWITCH from summing network then route signal to summing amp / or / master outputs.
Please note!
- Power off internal amp to avoid speaker damage!
- Set Summing to Passive mode
- Active mode (first time) operate with low level DAW signals!
- The other inputs are still active and works as regular summing inputs.
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—E
xternal 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
Multibus Group Send with fixed inputs
Sub Group summing for Multi–Bus Compression technique
Fixed sub mixers (slave sum ABCD) with dedicated inputs, each sub mixer (slave sum) group come with individual send/return for external process – then return to Master for final summing.
for example:
- 4 x “slave” sum (A B C D)
- 4 x Send /return
- 1 x Master sum
*you can order as many channels and options you want
Multi-bus compression routing Matrix
Bus A, Bus B, Bus C and Bus D you can use the matrix swtiches to access the MULTIBUS compression / external routing process.
See ABCD multi–bus compression routing diagram
STEREO TO MONO conversion switch available only after RETURN / before /signal enter to master summing network
*Stereo to Mono CHANNEL conversion available on fixed group multibus
Separate instruments into different categories that will allow freedom of movement. (source MICHAEL BRAUER PRODUCTIONS)
- A – Instruments that are in the upper midrange of a song, such as vocals or keyboards, synths, percussion. Bring up the vocal a lot and it will only effect the instruments assigned to A Choose instruments for a buss that will compliment each other.
- B – Instruments that anchor the song such as drums, bass, maybe cello, congas. Adding more bass or kick will only have an effect on the other instruments assigned to B. Choose instruments that will compliment each other.
- C – Instruments that create transient midrange power and will have a lot of rides, such as guitars.
- D – Instruments that need the warmth of tube and are not played staccato. To be used in combination with other categories for glue factor.
The process is up to an individual’s taste and of course the application which dictates the approach towards the sound you are looking for. Sometimes only send the drums to B and the samples that support it to B and stereo buss, sometimes I don’t. What’s important is that you try every combination and see which sounds the best. Eventually, you’ll know the sound of the different combinations in your head at which point it becomes instinctual read more about : https://www.mbrauer.com/q-a
See more:
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 (2xStereo amplifiers)
- 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 set equally the both L/R side gains by 2 x 21 step precision potentiometers
Single (one) pot solution?
- QUAD stereo precision potentiometer
- order from http://www.goldpt.com/prices.
html around 350USD (tax / shipping) then send to my EU address.
Knob style
- Vintage style white cream “chicken head” knob
- Vintage style black “chicken head” knob
- Solid aluminium round black knob
Vintage Style Knob Colours
others
