Will the dbx 234s Crossover Work?

If you're using the crossover at instrument level it probably won't work.
The audio levels and impedances are too different.
It also looks like it is balanced audio.
Instrument cables are unbalanced.

By messing something up, will it blow up your equipment?
Probably not, but then this all seems like a strange arrangement to me and I'm not sure what you hope to accomplish. So I can't guarantee that it won't mess something up because we don't have all the info.

You might be able to use this in the the effects loop of one of the amps and also feed the output to the other amp's loop input. You still might have to deal with the balanced/unbalanced situation. But if you can make up proper cables you can get around that.

So in all of this, you are splitting a bass signal to go to a bass amp and a guitar amp... one that has guitar speakers?

It seems like a lot of effort for what? I'm not sure. Perhaps it would help if you explain what outcome you expect from this.

 

Answered on your first thread.

 

I guess what I was trying to ask, was why the guitar amp in the mix at all.
What does it bring to the table that couldn't be done with just one amp?
Without knowing that, it seems like a lot if time, trouble, expense and for what?

 

You like how the bass amp sounds. I get that.

And the guitar amp is "really killer."
Or the bass amp makes a "really killer" guitar amp?
Which?

This doesn't answer my question.

What does the guitar amp bring to this combination that is worth doing all of this?
How does having the guitar amp and the bass amp running together make things so much better than with the bass amp alone? Especially given that you have to go to the trouble to split the signal AND THEN protect the guitar amp from the bass?

 

Great!
What makes them work better together that you can't have with the bass amp alone?

 

I have done it with three channels with a sub, mid 2x10, and guitar amp. Neat fun and one way to skin the cat.