Cammo,
The IR output signal runs 10 mA. It is plenty to drive a single or double mini-emitter. With such a low current, I would not expect to lose signal over a longer run.
With 4 emitters, each will have about 2.5 mA drive current available. This is on the lower end of the acceptable range.
I'll have one of our tech. guys hook up 4 Xantech mini-emitters and see how it goes.
Dan Boone, ADI