I had a model with out the ABM and fealt it lacked nothing, it still had tons of bass adjustments or configurations(as they put it in the manual) to the best of my knowledge(which isn't much) I believe the ABM's main advantage is it allows you to tailor what freq. points are set for low pass for all 5 channels independently- as where you can not adjust the freq. of the low pass with out the ABM, if you have a good sub and good speakers I don't think you would miss anything getting a regular unit. And they can be found for a steal here at audiogon! a real bargain processor for the price they bring.
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