It DOES have a mono switch!!

My bad!! Somehow I missed that it does indeed have a mono switch - in the speaker select section. (I guess I found the single select button/dual trim pots arrangement a bit disorienting... I don't blame the designers - they're trying to give us the most functions in one rack space.) Anyway, happy to be able to test mono at the push of a button! 5 stars and my apologies.

Very versatile, incredible transparency

Well built piece of machinery... Very versatile, incredible transparency, would I highly recommend this over any thing in its class!

˛ndispensable thing in the studio

take more than 3 years.
works flawlessly.
true sound.
indispensable thing in the studio

Very Clean Sound

Nice unit! I've used it for months now and it's been holding up well. I'm very happy that Presonus prioritized transparency and keeping the sound as uncolored as possible. (Can't comment on the remote control, as I bought the rack unit when it came separately.) Flexible and convenient routing enables quick speaker comparisons, with and then without subwoofer. (My one regret is that I wish it had a mono switch!) Two words of advice to buyers: The push buttons feel a bit delicate, so be reasonably gentle with them and they ought to be fine. Also: the speaker select button configuration selects stereo pairs with one button each, but the trim pots next to them are Left and Right, one per speaker, so be sure to adjust both pots for your sub or else you'll get some wack phase issues.