A little more detail how I tested the different inputs: First, powered them up with no inputs plugged in at all, cranked the gain all the way and listened. Flipped the dip switchs for RCA and listened (nothing plugged in). Only thing audible was the faint white-noise hiss. At around 4 feet out I couldn't hear the hiss. Next I plugged in XLRs from a Behringer MIC 2200 using XLRs (I didn't test the TRS even though I could have with the MIC 2200). I use the MIC2200 as a pre-amp, kinda old-school version of mini-DSP, for my four, 18" SI sealed subs - driven by a Marathon MA5050 pro amp. Using the XLRs there was no additional noise added. I tried the RCAs next through the Onkyo expecting hum. I was elated that the RCAs performed like the XLRs.
My wife and I auditioned 2-channel music for the next hour or so with the Onkyo in Pure, or Direct - no bass management. Her reply, "How are these only $200 each?" Next we tried some movie scenes with bass management engaged and were impressed. The blue lights were annoying but easily fixed with a small piece of black electricians tape.
Our theater room is weird. It's on the second floor and about 2900 cubic feet with a few sloping walls near the ceiling. The front wall is only 12.5' wide but opens up after 7' back to over 26' wide. The depth is 18'-ish. Our front row seating is only about 9' from the front screen (115" scope) so the Kali speakers atop the subs put the front of the speaker about 8'-8.5' from the listener. The Kalis have plenty of power to handle the higher volume using them as theater speakers. I'm not sure if they'd be enough in a larger room.
Couple other things to note. I bought a fairly burly extension cord to run from a Panamax device to power the speakers. I put the Kalis on an outlet that operates through triggering the Panamax outlet(s) from the Onkyo (my MIC2200/Marathon pro amp are also triggered on/off through this device). So, when I hit the Onkyo power the Kalis, subs and center channel (powered by an Emotiva which will be removed when in IN-8s arrive) all fire up and shut down by the one Onkyo power button. I'm not sure if it is a bad idea to power the Kalis on/off this way but it's a simple solution and this works well.
Also, the room has some acoustic treatment. Before the Kalis I was trying some JBL 8340s as the left and right channels as an experiment. They were actually much better than I expected with impressive dynamics, but it was obvious they're not completely neutral and have the X Curve. The acoustic panels on the side/rear walls tamed the room making center dialogue better than untreated. I'm going to remove the side treatments soon for the Kalis to see if the soundstage widens.
I've tried a bunch of other speakers (Salk, Mirage, Paradigm, JTR, etc.) in my theater room. I've enjoyed the Kalis the most except for some JTR Quintuple 8s. The JTRs were glorious but my older brother has them now. They were also a bit overkill due to their size for my particular room. The only reason I had the JTRs was due to my younger brothers passing due to cancer in 2014. He had gobs of excellent audio-video equipment so we two surviving older brothers shared those things we inherited from him. So, a lot of my speaker/equipment trials have been due to him having so much equipment he hoarded; I'm sure many here can relate.