Can I bi-amp ProAc Response 3's

Yes, they can be bi-amped, but why??? Nothing but money and trouble and more cables and ICs. Get a good amp, SS or tube and be done with it.

If you already have two amps you should get an electronic crossover. Different selectable gain isn't enough for bi-amplification and even perfectly matched components can go out of tonal balance turning sound onto the mess. I know that Bryston specifically asks when buying two identical amps if they must be matched and they do match for vertical bi-amp.
You can get Marchand electronic crossover SS or tube wichever you can afford and it won't break your bank or drive to the hardship of selling two amps and get one bigger. Extra interconnects also shouldn't bother you too much since in crossover domain thay mean almost nothing if quality is OK and connection is tight.

Thanks guys for your input. I went with Bi-wired Cardas
Golden 5C. Sound very musical,find myself lisening to the music for the first time in ages. I will up grade my amp
down the road. Thanks again...
Mike.