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Here's a good explanation of summing from fantastically skilled engineer Joe Chiccarelli from his review in Tape-Op mag:

"The Dangerous 2-BUS is a 16x2 analog summing amplifier designed to work with Nuendo, Digital Performer, Pro Tools, and other Digital Audio Workstations.

To put it simply, the software mixers inside these DAWs are implemented with "Math." Within the context of digital signal processing, math has its limitations, whether it's done with integer or floating- point arithmetic.

There are basic issues that affect the precision of all computer-based math, including propagation of rounding errors, numeric overload, and bit truncation.

Even within seemingly simple DSP operations, like the summing of multiple channels of digital audio, these issues not only affect the sound, but they also force us to be extremely diligent with the gain structure of our software mix sessions.

Finding workarounds for these limitations can leave us begging for an analog console.

That's where the Dangerous 2-BUS comes in.

With sixteen inputs, it allows you to combine sixteen channels of stems or direct analog outputs from your DAW via high-speed analog circuitry. You keep your automation in the DAW, but by bussing out to the 2-BUS, you bypass the internal summing buss of your DAW's software mixer.

Advantages?

You free up your DAW's processor for other tasks. You can run hotter internal levels, regaining bit resolution if you're otherwise pulling back levels to prevent overloading of the internal mix buss. And you have the option of inserting your favorite analog processors without an additional A-D conversion to get back into the DAW's mixer. These are all compelling reasons to go with a high- quality analog summing unit like the 2-BUS, both in terms of sound quality and in terms of workflow."

Full Article

TESTIMONIALS

JEFF ANDERSON • EQ MAGAZINE
“The improvement in imaging… with the 2-BUS… made the mix sound not only bigger, but more professional.”

RYAN GREENE • PRODUCER/ENGINEER
“Because of the stem mixing for video games I was doing, I tried the Dangerous 2-BUS, and my large format analog console went away very quickly after that!”

REUVEN • MIX ENGINEER
“I love the low end, it’s very unique the way the low end flows —amazing. The stereo image is wider on the 2-BUS too. Over the years I would sometimes try out other summing boxes to see what happened, but always came back to the 2-BUS.”

BARRY RUDOLPH • MIX MAGAZINE
“Mixing down a stereo pair [on the 2-BUS]…you’ll have more headroom and dynamic range, a wider stereo spread and clearer sound…than mixing inside Pro Tools.”

DAVID KAHNE • PRODUCER/MIX ENGINEER
“Dangerous was the first…with summing…they’re still the best. Completely transparent, more headroom, no color or distortion.”

DAVID MINEHAN • GUITARIST FOR THE REPLACEMENTS, PRODUCER AT WOOLY MAMMOTH SOUND
“I use my 2-BUS every day and get great results and compliments on the final mixes.”

JACQUIRE KING • PRODUCER/MIX ENGINEER
“The 2-BUS is the sonic equivalent of a large format analog console.”

NOËL JACKSON • MASTERING ENGINEER
“Control of the final summing process lets me deliver better mastering results. I love all the Dangerous Music equipment.”