New drivers for monitor 10b, amplifier? Circuit board upgrade?

Bass at 50%? Does that mean flat or you've got it cranked up 50%?

Loudness should be off, period.

Volume at 60%? You mean 1 o'clock? That's too much volume. You should never go past noon and that's probably pushing it too far. 11 is a safer bet.

Basically, your starting point should be everything neutral: no loudness comp, and bass and treble at neutral settings. Then, if needed, you can make small adjustments to compensate for flawed acoustics in the room.

On my setup, I save "loudness comp" for when I'm playing music particularly softly. At least on my amplifier (NAD 3155), that helps me hear the highs and lows better, without disturbing the neighbors.

How do you have the receiver/subwoofer/speakers interfaces set up? If your equipment permits it, you should have the low bass frequencies to the speakers rolled off. Ideally they should be produced only by the sub. The sub and/or the receiver may be designed to facilitate this crossover. Check the instructions.

Those 10b speakers weren't designed to handle modern HT low-frequency sound effects, nor are they intended to achieve rock concert sound levels. You don't want to attempt to replicate the "thump-thump" sound of a badly-setup and badly-overdriven car stereo. (Or at least I hope that's not your goal!)

They're designed to present as accurate of sound and as nice a soundstage as could be achieved thirty years ago at a particular price point. They still hold up well today, as long as you don't ask them to do what they were never designed to do.

That said, with a proper set up, the sub should take some pressure off of the speakers, and permit some good sound.

Let us know what other questions you may have.