Awhile back, we tested 3 summing mixers. We don't want to get into brand names because we don't want to do a shootout. We just want to get some info out there because summing mixers are growing in sales while being the topic of much debate.
First the concept behind the gear. Summing mixers are supposed to help your daw audio sound more like it has gone through an analog console. Your audio is sent through analog circuitry to add warmth but, it's also bypassing your digital summing pipe so you can get better stereo imaging. Some boxes do only that while others claim to add some color to your sound, maybe a little beef on the bottom etc.
Second, our test. It's not so simple to do an accurate test to see exactly what the mixer does compared to your in-the-box mix. The web is loaded with controversy about it and it can be confusing. We talked to reps from the companies to make sure we were using the boxes properly. We chose one inexpensive brand, one middle priced and one high end. All units performed 8 channel summing.
Third, the result. We noticed a difference in sound with all 3 units, however, all of us here at the bag didn't always agree that the difference was an improvement. Overall, the difference was small and sometimes hard to detect. With a little more investigation we found that summing really becomes more significant at 16 channels and beyond. Imagine a 48 channel console. The cumulative effect of all those channels is really where the magic is. For project studios with less than 16 channels of output to be summed, you may find results that leave you wanting more for the money you spent.
More companies are coming out with summing mixers since they've been a hot item and maybe the technology will improve for 8 channel capacity so, this could be an interesting category to watch.
