Splitter on gpa 555!pre amp output

The pre-amp is a GFP-555. Would you think/guess this is a better way to run these two amps vs bridged in mono? I will search for the GFPs output specs. Thanks

My manual states output impedance of 100ohms

Keep remembering stuff because its been so long since I set this up. I also have an Adcom GFS-3 speaker selector in place. It has one input that would accept only one amp. I guess if I’m really wanting to separate the two 555s the selector needs to be removed? Is a speaker selector with 2 sets of inputs a possibility?

You have a GFP-555 preamp, two GFA-555 power amp, a GFS-3 speaker selector and two pair of speakers and want to connect all these thing up?

Please tell us how you want it to be setting up, play both pair of speakers at the same time? or you want to listen to one pair of speaker at a time?

By the way, if you want to play both pair of speakers at the same time, and bridging the amp as mono blocks and connect two speakers to each mono block is NOT advisable!

I am trying to play all 4 at the same time using both GFA 555s. I have been running them in mono and wired as per the manual states. I am trying to run them both amps independently in stereo using the GFP 555 and remove the GFS-3 speaker selector. The way it has been set up is not the best I understand. Please give me your thoughts so I do not cause damage. 
Thank you