Sorry if this is a newbie question, but I just got my first sub installed in my truck yesterday, and I was wondering if it's normal for my sub to thump when I turn it off. It's a pretty loud thump, not like the little one when it powers on.
Clarion DB445 HU (it's pretty old, but it's just temporary, I just pulled it out of my wrecked truck for now) and a Power Acoustik PWR 180 my brother gave me, also pretty old, older than the HU.
So it's probably because they're old that it's thumping, and I can't do anything about it? Is this thump harmful to my sub?