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melbourne pughouse studios summing mixer

Passive Analog Summing Mixer – Unique Custom Studio Solutions

Warm Up your Digital ITB mixes – add analog depth and vibe 

You get the best custom summing mixer designed for Your studio.

Let me know your DAW interface soundcard type / brand.

  • Customer feedback: “Really cool passive analog mix bus summing box. Really well made. Noiseless, infinite headroom and no power required. The best way to mix outside the computer, enjoy clip free summing and then use the mic pres of your choice to send your mix back to your DAW recording and mixing”.. read more…
  • Paul makes some amazing high quality summing mixers. I’ve owned the Dangerous 2 Buss and the Roll Folcrom, and this easily holds its own with those units.

Most of products are no price indicated because of its unique setup. Contact me to answer to Your any questions or enquiries.

8x2 Passive Summing Mixer DSUB in - TRS out

339 € +shipping (basic setup)
8 In / 2 Out – Basic Version D-Sub In – TRS Out (-15dB reduction)
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429 € +shipping (basic setup)
16 In / 2 Out – Basic Version D-Sub In – TRS Out (-15dB reduction) “classic” design, see below the modern designs
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489 € +shipping 

16 In / 4 Out – TRS IN / TRS OUT BALANCED (order for XLR out) “classic” design, see below the modern designs

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699 € +shipping 

  • 32 IN: 8 TRS + 24 DSUB IN Balanced
  • 4 OUT: 2 TRS + 2 XLR OUT Balanced (MainRec/Monitor)
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8 INPUT - Custom Summing Mixer Examples

8 Input Passive Summing Mixer with 4 x Stereo to 8 Mono switch designed for Metric Halo / Focusrite

8 input Summing mixer 4x stereo to 8 mono conversion switches DSUB/TRS designed for Metric Halo and Focusrite DAW interface sound card – custom (UV Printed and Laser engraved) 


8 input Summing mixer custom designed for Universal UAD Apollo x8 Audio Interface with Master insert send return, variable gain switch, DIR+BYpass sum switch, –6 to -58dB Attenuator on the Monitor output and 4x stereo to 8 mono conversion switches for monos like vox, kick, bass, snare and so on.



8 in 2 out TRS Summing with Headroom, Input conversion Mono and master Mono switch

8 input – 2 output TRS balanced, PreSonus DAW with SSL bus compressor, 1xSTM, Vari gain, Master Stereo to Mono (mix mono compatibility test sw) switch designed for City Of Nine Gates Studio


8 + 2 AUX Input Passive Summing Mixer with insert designed for UAD - Focusrite ISA828

8 + 2 (AUX) Input Passive Summing (10×4) TRS/DSUB designed for UAD Apollo x8 Unison Preamps – Switch Insert SND/RET for Focusrite ISA8288 


8 Input Passive Summing Mixer with 4 x Stereo to 8 Mono switch designed for Presonus / Motu interface

8 input Summing mixer custom designed for Motu 828 and PreSonus Studio Audio Interface with four (4) stereo to 8 mono conversion switches for mono instruments like Kick, Bass, Snare and Vocal read more about…


16 - 28 INPUT - Custom Summing Mixer Examples

16 input Summing mixer - 4 x Multi master insert dsub balanced designed for Lynx Aurora / Chandler Limited / CAPI

16 input Summing mixer 2 x DSUB and 3 x stereo output with 3 x Stereo to 6 mono, -15/-25dB vari gain switch, direct bypass sum switch on 1/2 input and 4 x Multi master insert dsub balanced designed for Lynx Aurora / Chandler Limited EMI TG / 2400 Imperium / UTA MPDI-4, CAPI


16 input Summing mixer - designed for Antelope Audio Orion Studio Synergy Core, Ins A - Warm Audio, Inst B - Dangerous Master

16 input Summing mixer – 2 x Multi master insert TRS balanced, designed for Antelope Audio Orion Studio Synergy Core, Insert A – Warm Audio, Insert B – Dangerous Master, 2 x Stereo out as main and monitor, custom Logo laser engraving


16 input Summing - designed for Audient ASP 800 DSUB TRS Insert and 2 x Stereo out TRS

16 in – 4 out – designed for Audient ASP 800 on the master insert, 2xSTM, Vari gain switch, DSUB IN, TRS Insert and 2 x Master out Main / Monitor


18 Input Passive Summing Mixer with 4 x Stereo Insert designed for Presonus Studio

18 input Summing mixer custom designed for PreSonus Studio 192 Audio Interface with four (4) Master insert Send Seturns (chained ABCD) variable gain switch and 2 x stereo to 4 mono conversion switches for mono instruments like kick bass snare vox. Direct Monitoring switch with summing Bypass (comparison / monitoring) read more about…

28 input Summing TRS I/O designed for Avid HD I/O 16x16 and Access Virus C, Virus TI2, Moog Sub and Korg Elecribe, Uad Apollo Twin

28 input Summing mixer – 1 x Stereo to 2 mono, -15/-25dB vari gain switch, Stereo master insert, direct input with total bypass designed for Avid HD I/O 16×16 and Access Virus C, Virus TI2, Moog Sub and Korg Elecribe then record via Uad Apollo Unison preamp emulations, custom studio name engraving


32 INPUT - Mixbus - Multibus - Group Sum - Dual - Quad mixers

32 input Summing mixer 3 x DSUB 1-24 input  8 x TRS input 25-32, with 4 x Stereo to 8 mono, -10/-20dB vari gain switch, direct switch on 1/2 input (monitoring) designed for Antelope Orion 32+ | Gen 3 and 2 x Stereo XLR balanced out for Main Rec and Monitor


32 input – Mixed DSUB / TRS  Summing mixer 24 In DSUB, 25-32 in TRS, Master insert send return, variable gain switch, master stereo to mono out, 4 x stereo to 8 mono input conversion switches, custom Name engraving. Designed for Focusrite Liquid Saffire 56 (master) —>driven  2X ADA8000 and ADA8200 via ADAT Optical resulting in a total 28 analog outputs from DAW.


32 input DSUB - with unique Master insert/return designed for API 512c - AMS Neve 33609 Limiter / Compressor

32 input DSUB – with unique Master insert/return via DSUB – designed for API Audio 512c Mic Pre  AMS Neve 33609 Limiter / Compressor 8 stereo to 16mono switches, Direct monitor switch on input 31-32, Vari gain switch -15/-25dB, Main outputs 1/2 (processed), 3/4 SND, 5/6 RTN, 7/8 (pre insert) 


32 in 4 x Insert Bus 4x8 sections designed for Apogee - Cranesong - JoeMeek, RND

32 in 4 x Insert BUS – 8 ch sections (A: 1/8, B:9/16 C:17/24 D:25/32)  Sub groups: 4 x 8, Vari gain -10/-20dB Switch on A/B/C/D sub groups, source 2 Apogee DA16X – feeding Cranesong Syren, JoeMeek Brick or RND 511 read more about Multibus Group Send with fixed inputs


“THE QUAD” 32 in/8 out, 4×8 Input DSUB Tascam (4Group) as ABCD, 4×2 = 8 output XLR Balanced ABCD, 4xSTM ABCD (first stereo on each group), -25dB fixed gain reduction sum bus. 


2U Rack 16 - 64 INPUT - Mixbus - Multibus - Group Sum - Quad - Matrix mixers

16 input 2 Space 19″ Inch (2U) Rack Summing mixer, 8xTRS + 8xDSUB In, 2xStereo to 8 Mono, -15/-25dB vari gain switch, 3 x Stereo Master insert TRS/XLR, AUX input designed for Ampex 601 Tube amp, Neve style Mic Pre for the make up gain, Compressor /EQ Avalon 747 and Reverb unit Roland SRV2000


Mix Bus Matrix mixer designed for Neve and Avalon preamps this Passive summing box is a 16 channel analog summing mixer with four Matrix group send A B C D 4×8 = 32/ 16 stereo channels, stereo to mono input conversion, four 4 x master inserts in chain. The active amplification is performed externally by legendary Neve 1073 Mic Preamp/EQ – and Avalon VT-737SP and Neumann TLM 103.


Custom 2U Rack 24 ch passive summing mixer with 4x multi insert send return balanced stereo 6 x stereo to 12 mono, variable -15/-25dB gain switch, A/B out control, AUX expansion XLR input, direct monitoring switch on input 1/2, dual XLR out main monitor.


Custom 2U Rack 36 in 8 out, QUAD (4xsumming), 16 x Stereo mute switch, 8 out (4xStereo L/R) TRS balanced main ABCD, 16 x Stereo to 32 Mono switch, 4 x Stereo Group SUM Busses as: A 1-8, B 9-16, C 17-24, D 25-36, 4 x Stereo (8) TRS OUT ABCD


Custom 2U Rack 40 channel passive summing mixer with 3 x multi insert send return (INSERT A all time connected to preamp) multi purpose DSUB – 3 x Insert + 2 x Master out, 8x stereo to 16 mono, variable -15/-25dB headroom gain switch, 5 x 8 input ON/OFF control (per dsub)


64 input ch passive summing mixer with 32 x stereo to 64 mono conversion input switch

2U Rack 64 ch input DSUB/DB25 Tascam Balanced, XLR out passive summing mixer with 32 x stereo to 64 mono and variable -15/-25dB gain switch



Customer studio setup:

MPC 2500 *OR* UAD Apollo 8
RSE LTM-8 (Line to Mic level Converter)
x2 Hairball Audio Lola
x2 AML 1073
x2 RSE PC502
x2 Cranborne Camden 500
x4 SSL style Preamps
x2 Capi v26

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I have been working with Bob Katz doing the mastering. I want to share this quote from Bob. “Things are a lot sweeter! Compared to the previous mixes this overall sound, including the vocal, is like milk and honey! Overall with better balance and natural tonality. The sound has very nice dynamics and impact. It's a total transformation. Good clarity, instrumental balance, stereo image... Feel free to use the +18 setting or even a hair higher if available as your peak level does not exceed -5.6 dB.”  Bob Katz  This is to the Dr Flouride Mix 24 summing mixer you made thank you. It’s letting me do world class work in a very remote environment.

Cr Jeffrey McLaughlin

The real deal maker is that you can get a custom built one that suits your exact needs. The international shipping was very fast to the West Coast USA, and the build time was within a week for my specific custom needs.  I'm so glad I came across Paul's stuff. Definitely a great choice!!

Mike Castonguay -

Hi Paul, After a few days of tweaking and tweaking the entire system, the summing is sounding beautiful and my mixes are crisp and full-bodied like never before! Stereo is wide and mono puts a lot of body and punch to the songs. Thank you very, very much.

Alexandre Ciaglia

My REVIEW: Clarity and Glue. It clearly sounds better than in the box summing, but you all knew that would be the case. It also sounds better than the AMEK console that I had been using for summing mixes. I had sold the console and this was one of the replacement parts. I am Very Happy. I would highly recommend Paul Taylor’s custom built products. he was easy to deal with, great communication and ultimately a great sounding box that let me interface the preamps I already have as the 2 buss. A serious upgrade for a box that is reasonably priced for what it does. I would love to hear the other active summing mixers that he makes, but for now, I am a happy studio owner with the box he sent me.

Herb Belofsky Drummer · Austin, Texas gearpace (gearslutz)

Gearspace summing review (see on gearslutz)

I have been mixing for about 15 years now and all my mixes have been done in the box. I work hard to get the harsh digital sound out of each track.  Using plugins like Oeksound’s Soothe, UAD Studer Tape, Oxford Inflator and others to bring some analog beauty to my mixes.

I have heard about analog summing for years. Fab Dupont highly recommended it on one of his Puremix tutorials. But I have heard other mix engineers like Andrew Scheps say he doesn’t use any analog gear when mixing. So I was skeptical of spending my hard earned money on something that “MIGHT” work.  So I never did. Until just recently when I came across a few Vintage Maker videos. 

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Frequently Asked Questions - Passive Summing - FAQ

Can I use my DAW interface “stock” mic preamps or line input’s for gain makeup?

  • Yes, you can. By prior consultation the mixer will be designed for your DAW mic preamp working range, so you can use your DAW interface mic preamp without any compromises.

  • To make the best gear for you, just let me know your interface type, gain range of your DAW mic preamp or external preamp (like +20dB /+30dB/+55dB/+65dB or more relative to 0dB)

You can order different gain reduction mixers as:

  • -6dB,
  • -10dB,
  • -15dB,
  • -20dB,
  • -25dB or more

Variable gain switch like:

  • -6/-16dB,
  • -10/-20dB
  • 15/-25dB or more

Mic Pre (max gain) / Summing reduction ratios example: 

  • 30dB Mic Pre = -15dB Summing reduction

  • 60dB Mix Pre = -25dB Summing reduction

  • plus minus 5dB

Based on customer feedback, these values provide the best SNR and Headroom 

The other passive mixers on the market come with huge  -35dB to -40dB gain loss, which requires +50 to +60dB gain make up, which in my humble opinion is meaningless, and it requires expensive preamplifiers, but if you have them, you are a lucky man:)
For example customers with -25dB gain loss summing use +50 dB to+60 dB  range gears like Neve 1073, Avalon etc. with great success based on  customer feedback since 2010′.

Why Passive Summing gain reduction?

  • Gives Analog Headroom
  • Provides load isolation 
  • Channel to channel isolation

As all analog mixers as well the passive summing network need to have summing resistors placed on channel inputs,due to those (Vishay Dale) resistors  provides load isolation and improves channel to channel isolation.

The point is, it couldn’t be summed different instruments without resistor (gain loss) isolation, if you try to do without resistors as result you get over 0dB, furthermore you get clipping above 0db actually cause worse audio quality…

The gain make-up amplifier like an External amp — your DAW mic preamp or line amp or Internal transformer based amps like Lawo or Filtek or Neumann which follows the buss (master stereo L/R out) compensate the gain loss of passive summing mixer.

  • Headroom is how much room has your audio signal has before it starts to get compressed and distorted.

  • Headroom – It provides buffer zone for harmonics, transients or loud sounds without risking clipping, which result a more dynamic open and wide, depth 3D sound. Also it provides space for Gentle Harmonics Distortion. 

In digital and analog audioheadroom refers to the amount by which the signal-handling capabilities of an audio system exceed a designated nominal level.[1]Headroom can be thought of as a safety zone allowing transient audio peaks to exceed the nominal level without damaging the system or the audio signal, e.g., via clipping. Standards bodies differ in their recommendations for nominal level and headroom. (wikipedia)

Driving the PASSIVE SIDE will add harmonics to help ‘image’ sounds. 

By proper gain staging can achieve the Analog Harmonics Sweet Spot

How to hit analog harmonic distortion ?

Simply boost up your DAW output Level (master fader) – and you get some “nice” distortion because you’re pushing the summing quite a bit over its nominal level  

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Coloring or non coloring amp? that is the question….

Well, you can use a really warm tube amp for sound colour, or a really transparent non coloring amp for clean sounding, that’s your choice, and depend of your audio material. IMHO my customers really don’t like to change their mix character. On the other side the nice and pleasant harmonics can make the magic on your music.

btw — add an EQ for coloring / adding tone can massively redefine the tone of mix, and sounds really cool..:)

So no problem at all If you do not have expensive microphone preamplifiers, You can use for gain make up Your existing DAW Mic Preamps or instrument line inputs with GREAT success because you will get a custom built passive summing mixer designed for your preamps work range.