anyone biamping with B&K ST-140?


Anyone tried biamping with two B&K ST-140 amps? I want to biamp my Paradigm Studio 60 v.2 speakers. Any have this set-up? Also, any idea on the different ST-140 amps? I've seen some with handles and some without. I have also seen some with blue and red lettering and some without. Do I have to have two identical ST-140 amps to biamp? Will I need an external crossover? thanks
128x128fishcall
Why can't my brothers do cool stuff like that.One golfs and the other kills everything with fur and scales.
I see 2 different 105W ST-140s with red & blue lettering. One has speaker outputs on opposite sides of the amp, the other has both speaker outputs and line inputs on one side, (the right hand side as viewed from the rear.)

Anyone know the difference between these 2 105W models?
I have the blue with red lettering version (105w), non-balanced. My speaker outputs are on the right. I think the balanced version has the outputs on both sides.