The simple and straight forward answer is yes. Speaker manufacturers neglect the internals of speakers when they are trying to keep costs down. They know the 90% of people aren't even going to look inside.
Even if you just replaced the critical parts on the xover, it would be a great improvement. When I upgrade xovers, I focus on the high and mid parts, a lot less to be gained from the low portion of the circuit. Furthermore, I typically just swap out for like values, and only on ocassion, do I bypass caps.
Bottom line, it's right up there with the best money you'll spend on audio.
Even if you just replaced the critical parts on the xover, it would be a great improvement. When I upgrade xovers, I focus on the high and mid parts, a lot less to be gained from the low portion of the circuit. Furthermore, I typically just swap out for like values, and only on ocassion, do I bypass caps.
Bottom line, it's right up there with the best money you'll spend on audio.