The future is here

Check this out
 
http://www.unitaudio.com/
 
and a 16 channel version is coming at around $349. For those wanting to play with OTB mixing, other than making your own summing box, this is the lowest I have seen.

I would imagine its a smaller commercial version of the DIY schematic that has been out on the internet a few years. If it's totally passive it really is nothing but a straight wire sum buss. The trick is to put a really nice stereo preamp and compressor/limiter on the output. Reviews will vary by the preamp used at the end. Same as the folcrom.