They NEED to be raised up or tilted up in a desktop environment otherwise they aren't even aimed at your ears, plus the reflections off the desktop are awful.
Because they have boosted the bass to try to compensate for the small bass driver, the level limiting kicks in VERY early if you're listening to bass heavy content and then they change volume constantly and sound terrible. Removing low bass via EQ, say gently rolling off everything below 100Hz at 6dB per octave, will help them do more volume.
How do I know this? My son has a pair.
Why do i get the feeling you are asking low power speakers to do what they just cant?
At best the mr4s with no sub are good for some bass and upwards, at low to moderate SPL. They are nearfield monitors... I do not use mine as loudspeakers and would not expect them to handle that duty at all. In saying that i always run them in monitor mode and never in music mode.
If i was to try to listen to bass heavy music on them... i would carefully pick the music and keep it quiet. Some bass comes through quite well i thought. But definitly no sub bass.
What tracks are you listening to ???
The truth us in the listening.
How does your son drive them?
In my music play back i have no EQ etc straight into the mr4 via audio interface.
The mr4's are really a monitor, which is not a happy go lucky sound, its a bit harsh, bright and revealing. They are pretty darn good for hearing small issues etc in the low to high range, for lower than that , no, they do not go there. Which is why i bought the sub.
For the price you get a whole lot of upper range clarity. It's definitly not the last word in small bookshelf speakers but heck they are clear.
My goto track for speaker thrashing is Hotdrum by joyryde it has some decent bass. Set the mr4 to monitor, take all eq off the signal, set signal output to about 30% and the monitor input to about 70% . Set the signal output volume until it sounds the best, not loudest but the best. Glue the controls.
As you would expect the sub bass will barely come through, but there should be no "clipping".
Home again by steely dan should sound pretty good too. Listen to the closed hihats. So crisp. Not bad for the price.
Have a nice day. :- )