2 Stereo amps to be used in Mono...hookup?

I would add if using those amplifiers 'bridged to mono' is confusing... You should not do it. I agree with others writing you gain nothing and risk a lot.        
Most amplifiers stable into 4 ohm as a stereo amplifier are NOT suitable for use with 4 ohm speakers when 'bridged'. Period.I have no idea if the op speakers are actually 4 ohm? Does the op know???

ishkabibil

I forgot to ad in my last post.
If you have two of these stereo amps already, this vertical bi-amping arrangement, will give you the best sound, forget bridging.

 http://www.av2day.com/wp-content/uploads/2014/05/biamp2.jpg

Cheers George

@georgehifi 




Thank you but speakers are not bi-ampable...

@elizabeth 



Speakers are 8ohm.

@georgehifi 



I am not in possesion of 2 amps but may have an opportunity to land a second one for a friend or perhaps keep for myself if to bridge...given yours and Elizabeth's post I will pass on bridging.  I am really satisfied with my sound.   If I looked at my components I should probably if anything consider my delivery of music...I am a streamer using Bluetooth.....rblink Arcam....should go network..or ethernet cable....
If I had the A400's which are bi ampable I would consider for sure your passive diagram sent. I have a screenshot saved.

Thank you.