I upgraded my ACT 3 with the ABM, and it's worthwhile; gives you very flexible control. Contrary to what you might read, it does not permit a different crossover point for each speaker, but what it does allow is different crossover freqs for different modes. For example, you can crossover at 80 Hz for movies and at 45 Hz for music.
Seeking opinions an Acurus ACT-3 w/ & w/o ABM
System is 75% home theater use. Are there great and noticable avantages with the later units that have ABM. Is one w/o going to be seriously outclassed by successor. Any comments, feedback, opinions, whatever, on these two units will be helpful and greatly appreciated.