Hello
I own a Siemens V2275 (shall be this one vintagetools shop | Siemens 2275/1). It shall be very much similiar to Neumann V475 units.
Now I want to build a summing mixer around this unit. I can solder but otherwise I have no idea about electronic. So I hope you can help me.
What are the pros and cons of active and passive versions? I tend to build a passive unit as I am more flexible with the preamp coloration. I want something like a neve style preamp. If I go for an active summing mixer, how to include this?
Where can I find DIY Tutorials for this? Google didnt help me very well. Maybe you can 🙂
I need 8 Inputs and a stereo (preferably 2 xlr) outputs, as well as a send return switch between the summing mixer and the audio interface to be able to hear my edits live (or do I get sth wrong here)?
I just own the Siemens unit and want to include it in my productions. I also think it will be fun working on my first DIY project and learning more about the stuff I use daily.
Thanks a lot 🙂
I own a Siemens V2275 (shall be this one vintagetools shop | Siemens 2275/1). It shall be very much similiar to Neumann V475 units.
Now I want to build a summing mixer around this unit. I can solder but otherwise I have no idea about electronic. So I hope you can help me.
What are the pros and cons of active and passive versions? I tend to build a passive unit as I am more flexible with the preamp coloration. I want something like a neve style preamp. If I go for an active summing mixer, how to include this?
Where can I find DIY Tutorials for this? Google didnt help me very well. Maybe you can 🙂
I need 8 Inputs and a stereo (preferably 2 xlr) outputs, as well as a send return switch between the summing mixer and the audio interface to be able to hear my edits live (or do I get sth wrong here)?
I just own the Siemens unit and want to include it in my productions. I also think it will be fun working on my first DIY project and learning more about the stuff I use daily.
Thanks a lot 🙂
Passive mixing is lossy. You'll always need makeup gain somewhere, so even passive mixing ends up active in the end. Active mixing (like the Neumann box) is essentially passive with built-in makeup gain.
If you're trying to do 8 mono inputs mixed and panned to a stereo output, then this is an active project. Just adding mixing controls will produce a 10-20dB loss. To avoid channel and panner interaction they will need buffering (active).
However, this does seem like an odd project. If you want the coloration of a device, then send your ITB mix through it, the result will be the same as OTB active mix, but your project will be easier.
"Coloration" is just another term for the composite of all distortions in a device, presented as a positive subjective spin. You can apply to the stereo mix either after ITB or OTB.
If you're trying to do 8 mono inputs mixed and panned to a stereo output, then this is an active project. Just adding mixing controls will produce a 10-20dB loss. To avoid channel and panner interaction they will need buffering (active).
However, this does seem like an odd project. If you want the coloration of a device, then send your ITB mix through it, the result will be the same as OTB active mix, but your project will be easier.
"Coloration" is just another term for the composite of all distortions in a device, presented as a positive subjective spin. You can apply to the stereo mix either after ITB or OTB.
I don't know where you live, but 8 XLR input 2 stereo output (usually TRS 1/4 phone plug sockets) are ~$40 used on ebay and $199 new. Respected models come from Shure, Peavey, Alesis. I own 2 Peavey PV8 mixers. The $40 one for repair had a bad via through the board causing all left channel outs to be dead. also a bad master volume pot, new pot $3 & $4 box of 2 mm screws to hold it to the panel. The $199 new one was an orphan PV8-USB getting very old on the shelf. I haven't tried out the USB part but works great as an analog mixer & tp line driver.
On the PV8 you can mix each xlr (mike) into either left or right channels as you wish, or send out to an output board effect for custom frequency mods or effect (reverb). Each input has simple bass, mid, high, frequency knobs. There are 4 outputs, main, monitor, effect box, and tape unit (RCA jacks).
The shure units are much simpler.
As Peavey used NJM4565 for input and frequency amps and NJM4580 for line drivers, op amp hiss is negligible for home use. I could gladly upload tracks to various share websites. My music room is not more than 72 db s/n.
120 db s/n mastering consoles are usually custom built. See groupdiy.com for guys that build & use those. Pity the final product professionally produced CD is usually compressed within an inch of its life to drive the car owner in the next parking spot crazy.
On the PV8 you can mix each xlr (mike) into either left or right channels as you wish, or send out to an output board effect for custom frequency mods or effect (reverb). Each input has simple bass, mid, high, frequency knobs. There are 4 outputs, main, monitor, effect box, and tape unit (RCA jacks).
The shure units are much simpler.
As Peavey used NJM4565 for input and frequency amps and NJM4580 for line drivers, op amp hiss is negligible for home use. I could gladly upload tracks to various share websites. My music room is not more than 72 db s/n.
120 db s/n mastering consoles are usually custom built. See groupdiy.com for guys that build & use those. Pity the final product professionally produced CD is usually compressed within an inch of its life to drive the car owner in the next parking spot crazy.
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