Unit Audio

Unit Audio analog summing mixers add back some the sparkle and punch of analog recording that is so often missing in a purely “in the box” mix. These mixers start at $149.00 plus shipping, Easy setup, small footprint and an uncomplicated signal path makes these mixers the perfect companion to a Digital Audio Workstation.

With modern DAW software, mixing within the computer has resulted in some great sounding recordings, but I have long been intrigued by the concept of analog summing. I was not prepared to pay $800.00 or more to test that theory, so I engineered and built my own. Then to test the theory, I set out to see if there was any difference in the mixed sound. Much to my amazement and pleasure, I did notice a subtle but very pleasing difference in the stereo separation and placement of the instruments compared to my In the Box mixes."

Most of us with small recording studios in our homes have probably gone through the same equipment scenarios, better microphones, preamps, software, plugins, countless upgrades in our computers, but we are still missing that polished, subtle end sound. If you are like me, putting a studio together on a budget does not leave enough room to buy an $800.00 or more summing mixer. This is where the line of small passive summing mixers from Unit Audio comes in. I designed and built these passive mixers from a tested schematic found, of course, on the Internet. These mixers are to be used with 8 or 16 channel converters. Again if you are like many of us out there you may have a multi- channel converter and only use the inputs for tracking and maybe two outputs for playback. This leaves a lot of unused outputs. These outputs can run through the summing mixers balanced line inputs and then out of the two summing mixers balanced microphone level outputs into a microphone preamp for increased gain. You then run out of your preamp back into two channels of your DAW for your stereo mix. Pretty simple. The resulting sound is subtle, but definitely better. The stereo separation is better; the bass sounds are tighter and more defined. These mixers require no power to operate, no batteries, no wall connections. There is no AC line noise; they are simply transparent, and now at an affordable price.

Q: Is analog summing going to make your recordings sound like a Nashville studio with a billion dollars worth of equipment?
A: Probably not, but you will notice a difference in your mixes using a Unit Audio summing mixer.

The Unit Audio summing mixers are pretty simple to set up. Once you have the mixer connected it can simply stay in your recording mix path. There really is no need to disconnect it. All you have to do is run cables out of your converter outputs to the Unit Audio summing mixer balanced line inputs. You then run cables out of the Unit Audio summing mixer balanced microphone level outputs into two channels of your microphone preamp. It is a good idea to have both preamp channels be alike. The microphone pre that you use dictates the final sound that you will get in your mix. The final stage of setting up is to come out of your microphone pre into two input channels of your converter and mix to stereo in your DAW. Because of the passive circuit in the Unit Audio mixers, there will be about 30db of gain loss. This is why you need the mic pre at this stage. The really pricey summing mixers have make up gain built in which in turn creates a final mix of whatever coloring that particular circuit adds. By using your own preamps you can adjust your final mix sound by the character of each individual pre amp. It is pretty cool. I will be happy to answer any questions you might have about set up, or anything. Send an email to, or use the email submission form on the contact page.



Phone: 6125785429
Postal Address:
Unit Audio
1724 Champions Drive
37211 Nashville 

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