You can change the crossover points!
The first units had a fixed threshold for all channels but from version 2.0 (downloadable from net, pc only) you can also have different thresholds in the three channels. The compression ratio cannot be different on the channels though.
I've had this box for over a year and I'm very pleased with it's sound.
If you're going to buy, buy the stereo version.
You have more use of the S/PDIF if it's a stereo version.
One bummer is that you can't have it as dual mono.