JAY X

New summing mixer
« on: November 22, 2020, 12:08:45 PM »
Hi!

Just want to share some picture of my latest summing mixer. It is a modified version of a summing mixer i did some years ago, with neaw features in the front panel. I'm looking for opinions about the features. Because some potential users may like to have this or this.... ;D Basically I want to make sure the features are useful enough for studio use.

List of features:

1. Signal present / peak indicator at the output of the summing amplifiers. -20/-2 dbu.
2. Insert Blend fader and switch. (pre-fader).
3. Added a Mono switch to convert channels 1 to 4 in mono without loosing inputs. When engaged the MONO switch, channels 5-8 remain stereo. Otherwise with MONO disengaged all channels are stereo.
4. Output type switch as in the initial version. Selects output type: Electronic balanced Line driver or Lundahl transformer.
5. Big Mix output level knob as in the initial version.
6. And finally added Mix Output level Peak leds / Vumeters.
7. 32ch in db25 balanced format. But also a 16ch input version, upgradable to 32ch.
8. Balanced Send/return insert point pre-fader TRS jacks
9. Stereo TRS jacks for expansion input.
10. Mix outputs and multed Monitor outputs (to an external monitor controller) in XLR format.

11. Sound quality: I tested the mixer against an SSL Duality Delta, and we could compare the sound with a mix session they were doing: They sounded equal!! until we engaged the Lundahl transformer output (LL2811) in the Mikrosum... then we all could hear the difference: ¡Wow!! A good and punchy low end... 8)

I would like to have some opinions, or questions, I will answer here!!

Jay x

« Last Edit: November 24, 2020, 07:17:46 AM by JAY X »


JAY X

Re: New summing mixer
« Reply #1 on: November 24, 2020, 02:38:48 PM »
Hi!

Attached is a picture of the rear panel:

Db25 inputs, TRS expansion inputs, and below, th balanced insert send return jacks. More to the left, the XLR outputs for MIX out and multed monitor output. And last but not least IEC input socket with fuses.

Jay x.

JAY X

Re: New summing mixer
« Reply #2 on: November 25, 2020, 08:17:19 AM »
Hi!

For anyone who could ask, the front panel serigraphy was made with a Roland UV printer. It was a not a simple process... First we had to draw the panel on paper, and then, place the frontpanel over it and align it. For a one off process is ok...but not perfect. For a series, it will be necessary to build a wood pattern to fit the panels/pieces and align them to the printer head. In thiscase the printing quality and detail capable of UV printers is far better than it would have been with traditional serigraphy.

Jay x

ruffrecords

Re: New summing mixer
« Reply #3 on: November 25, 2020, 10:53:00 AM »
Just one question - when you switch the four channels to mono,do you simply pan them the the centre?

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

JAY X

Re: New summing mixer
« Reply #4 on: November 25, 2020, 03:32:11 PM »

Y
Just one question - when you switch the four channels to mono,do you simply pan them the the centre?

Cheers

Ian


Hi Ian!

Yes, but in a manner so that the volume remains constant. No difference in level between stereo and mono.
I asked some friends, studio owners, if this would be an interesting feature to have. For the Bass drum, Snare, Bass, and Voice.

Jay X

ruffrecords

Re: New summing mixer
« Reply #5 on: November 25, 2020, 04:01:13 PM »
Y

Hi Ian!

Yes, but in a manner so that the volume remains constant. No difference in level between stereo and mono.
I asked some friends, studio owners, if this would be an interesting feature to have. For the Bass drum, Snare, Bass, and Voice.

Jay X

I know what you mean. Id is something similar to add in front of a regular input (using 10K bus feed resistors) to provide a level control and a left/centre/right switch (see attached schematic).

Cheers

ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

JAY X

Re: New summing mixer
« Reply #6 on: November 26, 2020, 06:24:30 AM »
Hi Ian!

Interesting!.

Another option would be to try a balanced panpot... but this would need a quad pot...

Regards,

Jay x

ruffrecords

Re: New summing mixer
« Reply #7 on: November 27, 2020, 04:10:49 AM »
Hi Ian!

Interesting!.

Another option would be to try a balanced panpot... but this would need a quad pot...

Regards,

Jay x
I think it can be done with a dual pot. I am pretty sure NYD posted a schematic for it many years ago.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

JAY X

Re: New summing mixer
« Reply #8 on: December 29, 2020, 12:57:42 PM »
Hi!

When I published this thread, I expected to have some feedback about the summing mixer, its features, I like this, I would like that,..etc..many views but few comments... ::) Now I'm in the process of building a track to be mixed by a friend at his studio. This way we will compare the DAW mix with the summing mixer, line driver output and Lundahl transformer output. Meanwhile, please chime in!! :)

¡¡Merry christmas, stay safe, and hope a better 2021 year!!

Jay x


JAY X

Re: New summing mixer
« Reply #9 on: February 27, 2021, 11:10:39 AM »
Hi!

Here are links to raw mixes (not mastered), done within protools and with the summing mixer.

¡There is a difference in sound! ¿what do you think?

Jay x


https://soundcloud.com/azel909/protools-mix

https://soundcloud.com/azel909/mikrosum-s-mix32-transformer-output

https://soundcloud.com/azel909/mikrosum-s-mix32-line-driver-output-raw-mix

« Last Edit: February 28, 2021, 04:16:09 AM by JAY X »


Re: New summing mixer
« Reply #10 on: April 11, 2021, 04:15:25 AM »
The transformer output's mix definitely beats the other mixes. Better from far low end response, more headroom.

abbey road d enfer

Re: New summing mixer
« Reply #11 on: April 11, 2021, 05:45:17 AM »
I can't tell. The bass is so distorted to start with...
Who's right or wrong is irrelevant. What matters is what's right or wrong.
Star ground is for electricians.

JAY X

Re: New summing mixer
« Reply #12 on: April 12, 2021, 02:51:41 PM »
Hi!

¡Thanks for your comments!

This is the only way to know if I'm in the right track! ;D

In my studio I have 6.5" krk v6 monitors.(black cone). I can notice the difference, but i suppose it may be more evident with larger speakers or if I add a sub. This is why i ask for opinions. :)


Jay x




 

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