With regards to who's " job" it is to attempt to control shunting of audio systems where fire systems take precedence,you have to understand LIABILITY. You should not use devices designed for pro audio for this purpose , as was stated in numerous responses as a" fix".These are not designed for that application.And another point to consider is this : the A.H.J.'s demands on a job site,whether deemed "over the top" or not,supersede any code or rule in any fire code publication .And dont dare make any attempt to prove him wrong either . They generally dont like it! My point is this :fire systems always take precedence ,no exceptions ,and the liability of loss of life is far too steep a price to pay,cos you "think ya got it figured out" . Please call in someone from a fire alarm company .......its far too serious a point to take so lightly .You should have testing done with AHJ present,it looks far better for you ,as you will be asked to sign off on your work .Its called "cover your ass".This will state that "at the time of testing,the equipment performed as planned",Be prepared and think twice if you want that responsibility .PLEASE. NICET LEVEL 3 AND STATE FIRE LICENSE.....I EARNED THEM.