the box pro DSP 108

I would say it follows specs which is hard to find nowadays and very good for this price range. But response is really dropping below 60Hz don't expect to have any infrabass just "there at low relative volume" that you could boost... The manual is not really up-to-date controls don't exactly work the same but this is very similar so no problem.
-"Normal" is kind of loudness/bass boost setting whereas "monitor" aims for a flat response
-"music" is the most flat, "DJ" little boost on bass and "live" little decrease in bass; "speech" strong low and high filters starting~100Hz.
-Eq setting: Bass~90Hz, Mid~3kHz and treble~10 kHz I think
-personnal settings music/monitor/+3dB mid looks quite rather flat on 65Hz-11kHz and sounds good
-aux input is linked to the input 1 pre-gain knob, but it sounds pretty good I find. I don't think this is mixing both channels in mono then, probably just picking one channel I am not sure?
For the down sides:
-As mentionned in other comments there is a constant humming that I find personnaly a little loud, but I have no point of compariosn whatsoever maybe this is comparable to other brands. Roughly it is the same level up to 0dB master whatever pre-gain settings, but it really increases if we push master above 0dB. And bossting eq settings can also increase it significantly. I would say this speaker is made for loud volumes and noisy environments then, the humming is quite noticable if low volume in a flat for example...
-also seen in other comments, the overall "everything in plastic" looks cheap and not long lasting, let's see how it ages...
-about the DSP; before buying I thought it was only using it if we changed options, but apparently it is always going through it. Pushing the knob just gives access to the options. Then I would have liked to know what is the DSP, the rate and resolution for example but no way to find the infos...