Bobbytwonames 5,000+ posts
Trigger Man!
If it's only one of them it's likely to one closest to the port opening inside the box. Since it has the shortest path it unloads first. Ideally you want the subs to be equal distance from the internal port opening but that can't happen in every case for obvious reasons.
On moderate power systems you can get away with alotmof things but once you start throwing a lot of power these small issues start to show up. In your case you are probably already close to the others bottoming out at the same time. That one is just an early warning lol
It is the closest one to the end of the port inside the box. I turn it down whenever I hear it. I try not to go max demo on anything under 30hz. I can get it to bottom out on cue at 28hz. I can literally predict when it's going to happen. 28-30 volume at a soft clip. Guaranteed.