Beware of crosstalk!
This review will be simple, as most reviews are positive, as I think they should be. It's a fine unit for recording bands. I just want to make audio guys/pros/semipros aware that there is serious crosstalk between channels on my unit, so it would not be in the least bit useful for controlling multiple projects/rooms/speakers at the same time.
For example, when using the front aux inputs, you can have a separate stereo feed running into each of the 4 amps, combined with the main feed from the rear. If, for instance, you wanted 3 different users to be hearing only themselves and the main feed, this unit would be trash...they would be distracted by hearing the other user signals in the mix via crosstalk. Serious design flaw.
For bands or studio monitoring where there is only one mix happening at once, it works just fine, as the difference in db is, at my guess, around 20-25db difference, and masking will make the crosstalk effect negligible.
Also beware that you have to run a stereo feed into the front aux port or you will only get sound in the left phone.
Great unit for the price. I also highly recommend the OSP HPA-400 (recently rebranded) found on ebay for $100 if you have a cuemix setup to run prior to the amp and you are on a budget.