Setting Up a Crossover

You're gonna wanna base it more off the capabilities of the speakers. Check the manufacturer's specs on the frequency response of each (if possible you'll want the graph that shows where each slopes down, just to make your life easier), make an educated guess based on that, then use your ears to adjust from there. I was just reading that a problem with 4x10 + 1x15 is that the different sized speakers can cause phase cancellations in different places in a room, so maybe have a friend walk around a room in front of you playing and see if they notice a difference. Also, the SWR triad has the crossover point between the 10 and 15 at 100, so if all else fails that could be a good starting point.

 

Considering most 4X10's are louder AND lower then 1X15's, I would use the 4X10 for low and the 15 for highs.

The other way around, you would only need a 6" mid driver to keep up with a 1X15, so it makes using a 4X10 for highs useless.

 

and that's about all you need to know.

 

I have similar problem, but i am using 2x12 guitar cab (engl 212 pro with celestion vintage) for mid/hi and ampeg svt410HLF - this cab is low ass hell !
I don't have crossover yet, but hi/mid distorted freqencies sounding great with guitar cab, much better and harder than throught svt410HLF twitter.

 

And the 115 has better dispersion than the 410.

 

More of a downgrade in reality. There's so much information on this site concerning the inadvisability of this pairing. A simple search can get you all you need to know.

 

Necrobump.

An easy way would be a ABY pedal into a bass eq with the lows cut righf off for the guitar amp and the highs reduced on the bass amp.

There can be a phase problem using guitar amp like that. There is at least one active ABY with a phase switch.

 

This product can do it, it include phase switch. : ART Pro Audio
I Think better solution than pedals.

 

Yep that will work very well.