I'm going to run two sets of Infinity coaxials, so four speakers total.

The 100.4 would be a better choice than the 100.2, correct?

My sub will be run on a Sundown SAZ-3000D.

Edited July 11, 200718 yr by CrownVicLX

If fader control is important to you, as well as independent crossover flexibility front to rear then yes the 100.4 is the better choice.

Actually, I'd like them to play equally and balanced for front and rear.

Would a 100.2 work?

If your gains are set identical, the 100.4 would put equal power to both front and rear.

So I should go with the 100.4, then?

So I should go with the 100.4, then?

Either way will work.

For you, since you actually do want the same output front and rear the 100.2 will work fine and be less expensive.

The 100.4 running 4 ohms stereo will output a lower distortion signal compared to the 100.2 @ 2 ohms, though.