When you parallel a microboost it is not like doing it with dual flexdrives. One microboost runs full blast and the other only picks up the slack. Not sure what effect that would have trying to do it with a driver of different design.
It's a very specific fluke in the design of the Ben Boost that allows two driver of different set currents to be paralleled. The reason it works, is that (essentially) the two different set currents get summed, and then divided in half, and each driver then (more or less) handle's one-half of the summer current. So you don't actually have each driver supplying different amounts of current.
I *would not* count on the Microboost behaving this way alongside a Ben Boost, and from DTR's comments, it doesn't even sound like the Micro behaves this way when paralleled with one of its own.
More to the point, I can't imagine why you would WANT to do this. Is it just that you want pot control?!?
That, I don't understand. If you're paralleling two, then it's surely for a 445. 445s are generally all going to take the same current (almost all will survive 1.5A, and most will be ok up to 1.8A). So how much pot-control is needed?
I've been almost exclusively using 864mA versions, paralleled for around 1700mA. It works great. I wouldn't want to add the complexity of two different driver type to a build, just for the benefit of being able to play around with current via a pot, within 100mA +/-.
