Can I jumper across amp speaker outs to a 2nd amp's spkr outs?

@wbs 

There is a cut and dried answer  DON'T DO IT!

Wasn't  @devinplombier  explanation clear enough for you or do have learning difficulties or maybe your brain has turned to mush.

Have a nice day.  

Wasn't  @devinplombier  explanation clear enough for you or do have learning difficulties or maybe your brain has turned to mush.

What a particularly rude comment.  

@jetter 

Well we all know you can't fix stupid 🤪 

Thank you @jetter.  This is why I only have 132 posts in a quarter-century of membership.

Bill

"Can I jumper across from one  amp''s speaker outs to a second amp's speaker outs if I only power up one amp at a time?"

Yes, if:

1) amps have protection circuits with open contact relays if amp is OFF

2) neither of amps is in bridging-balanced mode

3) fool-safe ensuring of turning both amps the same time ON! Two amps turned ON can be disastrous! 

Speaker switch (can be used both ways, to work as amp switch) sounds more reasonable, safe solution!