Crossover stupid for 8x10 full-range cab?

Sort of. It depends on what type of crossover you mean.

Electronic crossovers are used mainly for bi-amping.

Passive crossovers are used whenever you have different functioning drivers in a single cab. In other words, if the 8x10 has a tweeter, you will have a passive crossover that prevents the low frequncies from going to (and destroying) the tweeter. Many of these will come with tweeter controls that adjust the relative volume of the tweeter.

Did I answer the question you were asking?

 

so if i want to do the same thing but my low end would be going to an acoustic b600h with an acoustic 1x15 and 4x10 and high end going to a 120w crate combo amp? I assume yes cause both those cabs and the combo are designed for full range usage, but I gotta ask

 

Whoa. What is the goal here with this franken-rig? That I gotta ask!

 

Nice blast from the past.

Is the Crate a guitar amp by chance?