This may be a situation where the speakers are exciting the walls in your low ceiling apartment, in other words its the room acoustics doing the shouting. You could check this by setting the system up outdoors or in another room and compare.
In any case there is a simple effective and inexpensive solution- Owens Corning 703 acoustic panel. https://www.amazon.com/Owens-Corning-Fiberglas-Acoustic-Insulation/dp/B07XTMRQHQ/ref=pd_sbs_267_3/14...
You may be able to find this or similar in hardware stores. You will only need one to maybe three sheets. They come 48x24 and cut lengthwise 48x12 (or 48x8) they can be pinned in the corners like this (see picture #24) https://systems.audiogon.com/systems/8367
OC703 cuts easily with a knife, and is so light weight you can pin or staple to the walls. Bevel the edges so it fits nice and neat, then wrap with fabric or spray paint so it looks better.
I had a similar problem in my room where certain vocals would excite this region and be unnaturally loud. As I recall Holly Cole was good at this, with certain vowels and certain notes held a while being the worst. This simple trick was the end of that.
Being where you are if you can’t find OC703 and don’t want to order a lot be aware any similar damping material will work so long as its placed in the corners like in my room. This works on the principle the walls and ceiling act like a horn that amplifies any sound coming from the corners. So eliminate any sound coming from the corners and you greatly reduce the problem without using a great deal of damping material, which would also solve the problem but make your room way too dead in the process.
In any case there is a simple effective and inexpensive solution- Owens Corning 703 acoustic panel. https://www.amazon.com/Owens-Corning-Fiberglas-Acoustic-Insulation/dp/B07XTMRQHQ/ref=pd_sbs_267_3/14...
You may be able to find this or similar in hardware stores. You will only need one to maybe three sheets. They come 48x24 and cut lengthwise 48x12 (or 48x8) they can be pinned in the corners like this (see picture #24) https://systems.audiogon.com/systems/8367
OC703 cuts easily with a knife, and is so light weight you can pin or staple to the walls. Bevel the edges so it fits nice and neat, then wrap with fabric or spray paint so it looks better.
I had a similar problem in my room where certain vocals would excite this region and be unnaturally loud. As I recall Holly Cole was good at this, with certain vowels and certain notes held a while being the worst. This simple trick was the end of that.
Being where you are if you can’t find OC703 and don’t want to order a lot be aware any similar damping material will work so long as its placed in the corners like in my room. This works on the principle the walls and ceiling act like a horn that amplifies any sound coming from the corners. So eliminate any sound coming from the corners and you greatly reduce the problem without using a great deal of damping material, which would also solve the problem but make your room way too dead in the process.