A classic example of the sanity of a) knowing the relative quality of your speaker’s crossovers and b) improving them if their quality is not to the level that you would like is the B&W Matrix 801 Series 2 speaker. Although widely regarded as one of the finest speakers that existed at the time of it’s introduction in 1995, it’s crossover was highly compromised due to the space limitations of the underside of the bass cabinet where it was placed in the interest of the speaker being highly moveable for it’s anticipated, and actual, use in recording studios...famously at Abbey Road Studios.
George Short, the brilliant speaker designer and founder of North Creek Audio stated that this speaker "...has some of the lowest distortion, inherently linear drivers of any speaker ever produced in one of the most acoustically inert cabinets of any speaker ever produced, but some of the worst specified crossovers of any high end speaker ever produced." This fact made his crossovers for said speakers extremely popular for at least two decades before he closed his business several years ago.
Suffice it to say, anyone with one of these speakers systems with Mr. Short’s crossovers has left the speaker consumer market.