I didn’t bother thinking about this, but I don’t want to get yelled at by people who understand it. But hey, it exists and is apparently measurable. Damping factor is apparently a thing and I don’t understand it.But you also want to make sure your speakers get loud enough. It’s a pain to have to much gain and have to live in a tiny area on your volume knob. Similarly, speakers can have very different sensitivities. You see power amps with anywhere from 6db to 32db. Gain- get enough gain, but not too much.It’s relatively easy to find mid-powered amps that support 2-8ohms, but it’s something to pay attention to on the spec sheet. If your speaker has dips to 2ohms in the middle of its range and your amp isn’t capable of maintaining current, you can get suckouts in those areas.
They may be “nominally” 4 or 8 ohms, but there can be significant deviation from this especially in the crossover region.
There are a couple major factors to keep in mind: Speakers can be very different from one another, mainly in terms of power requirements.