Speakers have all sorts of measureable attributes. Power handling, impedance, passband (aka frequency range), frequency response, phase response, and most importantly directivity (displayed best with polar patterns). Reproducing audio with speakers is one of the biggest engineering boondoggles, as actual linearity is impossible. Not that that totally matters, as what sounds “good” is wildly subjective. Top dogs in the biz have explained to me consistency in directivity is far more important than measured linearity in frequency response. Speaker enclosures are tuned to specific frequencies, the lowest they’re meant to reproduce. There’s no 440 vs 432 bullshit tho..