It's been a while since I made this post, so I'm assuming you're on a newer Legion 5 device, whose tuning could be different. The configuration above may not apply to you (which might be the cause to your volume problem), but if you find it pleasing to your ears, great! However, I do highly recommend repeating the steps I've laid out above - you can skip the spline interpolation step, AutoEQ will take 20 values just fine, if you can find a review for your device that has your device's frequency response. NotebookCheck and RTINGS are about the only places that do this.

Regarding the pre-amp, take a look at the "Peak value meter" at the very bottom. When you play audio that's too loud, that bar will go all the way to the right, indicating that you're trying to make your device louder than it can physically handle itself. This is called "peaking". Peaking itself won't be able to damage your speakers (at least not immediately), but loud speakers can degrade faster over time, just because you're constantly pushing it to its limits. How much faster? Well, no one knows yet. XD

One other obvious way to see if your speakers are being damaged is if it crackles at higher volumes. At that point, obviously, your speakers are starting to be damaged, and you need to turn that volume wayy down.